How to resolve build errors while integrating gmime into VS2010 project? - c++

I'm trying to use gmime in a vc++ project I'm working on.
I have gmime dependent dll, lib and header files.
Trying to build the first example from the tutorial fails horribly however.
This is the code
#include <stdio.h>
#define ssize_t long
#include <gmime/gmime.h>
int main (int argc, char **argv)
{
GMimeStream *stream;
/* initialize GMime */
g_mime_init (0);
/* create a stream around stdout */
stream = g_mime_stream_file_new (stdout);
/* 'printf' */
g_mime_stream_printf (stream, "Hello World!\n");
/* flush stdout */
g_mime_stream_flush (stream);
/* free/close the stream */
g_object_unref (stream);
return 0;
}
While build the vc++ project, I am getting following error,
Error C2061 syntax error: identifier 'GMimeStream'
Error C2059 syntax error: ''
Error C4430 missing type specifier - int assumed. Note: C++ does not support default-int
Error C2143 syntax error: missing ';' before ''
Error C2086 'int ssize_t': redefinition
Error C4430 missing type specifier - int assumed. Note: C++ does not support default-int
Error C2086 'int GMimeStream': redefinition
Kindly help me to resolve this issue.

Related

Member redeclaration not allowed in Visual studio 2019 (same code compiled successfully in VS 2013)

While migrating from Visual studio 2013 to Visual studio 2019 compiler I have got below error. Please help me in fixing the same.
I have declared the function in the header file (.h) below:
#ifndef CSAHCCOMPOSEDITEM_H
#define CSAHCCOMPOSEDITEM_H
#ifdef _UTEST
class CsaHcDICOMComposerTester;
#endif
class EXP_IMP_HcDicComp CsaHcComposedItem
{
#ifdef _UTEST
friend class CsaHcDICOMComposerTester;
#endif
public:
enum CsaHcComposedItemType
{
CISegment,
CIPage,
CILayout,
CIPageBracket,
CIPrintJobBracket,
CIDummy
};
CsaHcComposedItem
(bool &status, CsaHcComposedItemType type_in);
CsaHcComposedItem
();
CsaHcComposedItem a
(const CsaHcComposedItem& compObj_in);
CsaHcComposedItem& operator=
(const CsaHcComposedItem& compObj_in);
~CsaHcComposedItem();
bool operator==
(const CsaHcComposedItem& ci_in);
private: // attributes
CsaHcComposedItemType
myType;
CsaHcBasicFilmSession
*myBFS;
CsaHcBasicFilmBox
*myBFB;
CsaHcBasicImageBox
*myBIB;
CsaDib *myDib;
BYTE *myPixelArray;
};
#endif // CSAHCCOMPOSEDITEM_H
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
And cpp file contains the definition for the constructor.
//pusedo code
CsaHcComposedItem::CsaHcComposedItem(bool &status_out,
// Return status of the construcor
CsaHcComposedItemType type_in)
// Composed item type
: myType(type_in), // error shown for this line (70)
myBFS(NULL), //line71
myBFB(NULL),
myBIB(NULL),
myDib(NULL),
myPixelArray(NULL)
{
.....
}
Error:
1.CsaHcComposedItem.cpp(70): error C2761: '{ctor}': redeclaration of member is not allowed
2.CsaHcComposedItem.cpp(70): error C2059: syntax error: ':'
3.CsaHcComposedItem.cpp(70): error C2065: 'type_in': undeclared identifier
4.CsaHcComposedItem.cpp(70): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
5.CsaHcComposedItem.cpp(71): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
6.CsaHcComposedItem.cpp(72): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
7.CsaHcComposedItem.cpp(73): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
8.CsaHcComposedItem.cpp(74): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
9.CsaHcComposedItem.cpp(75): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
10.CsaHcComposedItem.cpp(78): error C2448: 'myPixelArray': function-style initializer appears to be a function definition

That source is compiled without error in VS2019(16.4.5)
I compiled with these declarations
#include <Windows.h>
#define EXP_IMP_HcDicComp
using CsaHcBasicFilmSession = int;
using CsaHcBasicFilmBox = int;
using CsaHcBasicImageBox = int;
using CsaDib = int;

Issue is fixed,
below line of code was not commented in my cpp file, after commenting it worked.

C++ error runing "hello world", vs2010

#include <iostream>
using namespace std;
int main()
{
cout<<"hello world!"<<endl;
return 0;
}
I am trying to run this simplest code in vs2010, but I received more than 100 errors when I was compiling it.
f:\vs2010\vc\include\fstream(14): error C2143: syntax error : missing ';' before '*'
f:\vs2010\vc\include\fstream(14): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
f:\vs2010\vc\include\fstream(16): error C2653: 'ios_base' : is not a class or namespace name
f:\vs2010\vc\include\fstream(16): error C2061: syntax error : identifier 'openmode'
f:\vs2010\vc\include\fstream(16): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
Errors like these. What should I do?

try to include this lab in your code
#include "stdafx.h"

c++, syntax error : missing ';' before identifier 'N0'

I have an issue compiling my code on windows.
On Unix-based systems all is working fine, but when I compile it on windows (currently with visual studio 2010 express), I'm getting the following errors:
Error 253 error C2146: syntax error : missing ';' before identifier 'N0' C:\ghost++\ghost\ohconnect.h 45
Error 254 error C4430: missing type specifier - int assumed. Note: C++ does not support default-int C:\ghost++\ghost\ohconnect.h 45
Error 255 error C4430: missing type specifier - int assumed. Note: C++ does not support default-int C:\ghost++\ghost\ohconnect.h 45
Error 256 error C2146: syntax error : missing ';' before identifier 'N' C:\ghost++\ghost\ohconnect.h 46
Error 257 error C4430: missing type specifier - int assumed. Note: C++ does not support default-int C:\ghost++\ghost\ohconnect.h 46
And so on.
I think it's all relating to my header file, the class itself is made to connect to websockets:
#ifndef OHConnect_H
#define OHConnect_H
//
// OHCONNECT
//
class CTCPClient;
class CBaseGame;
class CCommandPacket;
struct OHCHeader {
unsigned header_size;
bool fin;
bool mask;
enum opcode_type {
CONTINUTATION = 0x0,
TEXT_FRAME = 0x1,
BINARY_FRAME = 0x2,
CLOSE = 8,
PING = 9,
PONG = 0xa,
} opcode;
uint64_t N0;
uint64_t N;
uint8_t masking_key[4];
};
In my .cpp file I'm using namespace std; and included <string> only for windows.
But all this didnt work so far. I didnt wanted to put the whole files into the question since they are actually long.
Here is the full source:
Headerfile
Mainfile
What did I wrong here?

The compiler doesn't know the type uint64_t and uint8_t, add:
#include <cstdint>

Note also that the trailing comma in the enum (after the definition PONG = 0xa) was only standardized in C++11, following the change made in C99. Older compilers or those running in a mode following the older 1998/2003 standard may trip over that as well.

Visual Studio 2012 Express compiler not linking header files together correctly

I am setting up some framework for a little 2D game. Right now, I just have a few classes, but I am immediately falling into compiler problems.
I have run this program with only the main function, so I can confirm that the Allegro (graphics library) library linking has worked.
I have put all my header files (.h) under the "Header Files" section in the Solution explorer and all my source (.cpp) in the "Source Files" section. I have only modified settings from default as according to this Allegro tutorial: http://wiki.allegro.cc/index.php?title=Windows,_Visual_Studio_2010_and_Allegro_5. It should not have affected anything in a destructive way.
I have several files, so I will list each one. I will skip some code to reduce size and redundancy. When I omit any code or do anything not verbatim, I will put a comment in the code saying so. (EDIT: I actually did not skip any code)
main.cpp
#include "common.h"
int main(int argc, char **argv)
{
ALLEGRO_DISPLAY *display = NULL;
World* world = new World(640, 480);
if(!al_init()) {
fprintf(stderr, "failed to initialize allegro!\n");
return -1;
}
display = al_create_display(640, 480);
if(!display) {
fprintf(stderr, "failed to create display!\n");
return -1;
}
al_clear_to_color(al_map_rgb(0,0,0));
world->draw(display);
al_flip_display();
al_rest(10.0);
al_destroy_display(display);
return 0;
}
common.h
#if !defined(COMMON_INC)
#define COMMON_INC
#include "World.h"
#include "Pane.h"
#include <stdio.h>
#include <allegro5/allegro.h>
#endif
World.h
#if !defined(WORLD_INC)
#define WORLD_INC
#include "common.h"
#include "Pane.h"
class World{
public:
World(int wp, int hp);
void draw(ALLEGRO_DISPLAY* display);
void update();
protected:
private:
Pane* panel;
int heightPix, widthPix;
};
#endif
World.cpp
#include "common.h"
World::World(int wp, int hp){
widthPix = wp;
heightPix = hp;
panel = new Pane(this, 10, 10, 300, 400);
return;
}
void World::draw(ALLEGRO_DISPLAY* display){
panel->draw(display);
return;
}
Pane.h
#if !defined(PANE_INC)
#define PANE_INC
#include "common.h"
class Pane{
public:
Pane(World* w, int xv, int yv, int wi, int he);
World* getWorld();
int getZ();
void draw(ALLEGRO_DISPLAY* display);
ALLEGRO_BITMAP* getBackground();
protected:
void setXY(int xv, int yv);
void setWidthHeight(int wi, int he);
void setZ(int zv);
void setBackground(ALLEGRO_BITMAP* ba);
private:
int z;
int x, y; //pixels
int width, height; //pixels
World* world;
ALLEGRO_BITMAP* background;
};
#endif
Pane.cpp
#include "common.h"
Pane::Pane(World* w, int xv, int yv, int wi, int he){
this->setWidthHeight(wi, he);
this->setXY(xv, yv);
this->world = w;
}
World* Pane::getWorld(){
return world;
}
void Pane::setXY(int xv, int yv){
x = xv;
y = yv;
return;
}
void Pane::setWidthHeight(int wi, int he){\
width = wi;
height = he;
return;
}
void Pane::setZ(int zv){
z = zv;
return;
}
void Pane::draw(ALLEGRO_DISPLAY* display){
if(background != NULL)
al_draw_bitmap(background, x, y, 0);
else{
background = al_create_bitmap(width, height);
al_set_target_bitmap(background);
al_clear_to_color(al_map_rgb(255, 0, 255));
al_set_target_bitmap(al_get_backbuffer(display));
al_draw_bitmap(background, x, y, 0);
}
return;
}
The compiler produces this error report upon building: (I called the game madscientist because it is supposed to be alchemy-themed)
1>------ Build started: Project: MadScientist, Configuration: Debug Win32 ------
1> main.cpp
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(8): error C2061: syntax error : identifier 'World'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(9): error C2143: syntax error : missing ';' before '*'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(9): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(9): warning C4183: 'getWorld': missing return type; assumed to be a member function returning 'int'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(11): error C2061: syntax error : identifier 'ALLEGRO_DISPLAY'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(12): error C2143: syntax error : missing ';' before '*'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(12): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(12): warning C4183: 'getBackground': missing return type; assumed to be a member function returning 'int'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(18): error C2061: syntax error : identifier 'ALLEGRO_BITMAP'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(24): error C2143: syntax error : missing ';' before '*'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(24): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(25): error C2143: syntax error : missing ';' before '*'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(25): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\world.h(10): error C2061: syntax error : identifier 'ALLEGRO_DISPLAY'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\main.cpp(22): error C2660: 'World::draw' : function does not take 1 arguments
1> World.cpp
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(8): error C2061: syntax error : identifier 'World'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(9): error C2143: syntax error : missing ';' before '*'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(9): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(9): warning C4183: 'getWorld': missing return type; assumed to be a member function returning 'int'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(11): error C2061: syntax error : identifier 'ALLEGRO_DISPLAY'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(12): error C2143: syntax error : missing ';' before '*'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(12): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(12): warning C4183: 'getBackground': missing return type; assumed to be a member function returning 'int'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(18): error C2061: syntax error : identifier 'ALLEGRO_BITMAP'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(24): error C2143: syntax error : missing ';' before '*'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(24): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(25): error C2143: syntax error : missing ';' before '*'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(25): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\world.h(10): error C2061: syntax error : identifier 'ALLEGRO_DISPLAY'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\world.cpp(6): error C2661: 'Pane::Pane' : no overloaded function takes 5 arguments
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\world.cpp(10): error C2511: 'void World::draw(ALLEGRO_DISPLAY *)' : overloaded member function not found in 'World'
1> c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\world.h(7) : see declaration of 'World'
1> Pane.cpp
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(8): error C2061: syntax error : identifier 'World'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(9): error C2143: syntax error : missing ';' before '*'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(9): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(9): warning C4183: 'getWorld': missing return type; assumed to be a member function returning 'int'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(11): error C2061: syntax error : identifier 'ALLEGRO_DISPLAY'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(12): error C2143: syntax error : missing ';' before '*'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(12): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(12): warning C4183: 'getBackground': missing return type; assumed to be a member function returning 'int'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(18): error C2061: syntax error : identifier 'ALLEGRO_BITMAP'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(24): error C2143: syntax error : missing ';' before '*'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(24): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(25): error C2143: syntax error : missing ';' before '*'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(25): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\world.h(10): error C2061: syntax error : identifier 'ALLEGRO_DISPLAY'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.cpp(3): error C2511: 'Pane::Pane(World *,int,int,int,int)' : overloaded member function not found in 'Pane'
1> c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(6) : see declaration of 'Pane'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.cpp(9): error C2556: 'World *Pane::getWorld(void)' : overloaded function differs only by return type from 'int *Pane::getWorld(void)'
1> c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(9) : see declaration of 'Pane::getWorld'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.cpp(9): error C2371: 'Pane::getWorld' : redefinition; different basic types
1> c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(9) : see declaration of 'Pane::getWorld'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.cpp(10): error C2065: 'world' : undeclared identifier
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.cpp(30): error C2511: 'void Pane::draw(ALLEGRO_DISPLAY *)' : overloaded member function not found in 'Pane'
1> c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(6) : see declaration of 'Pane'
1> Generating Code...
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
You have all of the info that I do. I will summarize it for you to save the trouble of looking through everything.
There are classes separated into header interfaces and source implementations
common.h is included by all files. It itself includes all of the class definitions in the other header files
When compiled, the compiler does not recognize classes defined in other header files as data types. Errors, as you would expect, cascade down.
The real-time error checker does not register any errors. When hovering over the word "World" when it is used as a datatype in Pane, for example, it recognizes the type perfectly. The real-time error checker is the feature that red underlines errors before compiler time.
This Visual Studio 2012 Express is new except for the modifications mentioned earlier. The project was created as an empty C++ project. Before many headers and sources were add, the main function compiled correctly.
Thank you for any responses. If you have any questions, please ask. The problems I have with Visual Studio always irk me.
EDITS:
My circular header logic is guarded by the header guards. I don't think this redundancy is a problem.
I tried removing all includes from my header files except for includes to Allegro libraries. This seemed to work better, but there are still weird problems. Why the act of including is causing these data types to error is still a mystery. Here is the new error log:
1>------ Build started: Project: MadScientist, Configuration: Debug Win32 ------
1> main.cpp
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\world.h(16): error C2143: syntax error : missing ';' before '*'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\world.h(16): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1> World.cpp
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\world.h(16): error C2143: syntax error : missing ';' before '*'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\world.h(16): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\world.cpp(6): error C2065: 'panel' : undeclared identifier
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\world.cpp(11): error C2065: 'panel' : undeclared identifier
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\world.cpp(11): error C2227: left of '->draw' must point to class/struct/union/generic type
1> type is ''unknown-type''
1> Pane.cpp
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\world.h(16): error C2143: syntax error : missing ';' before '*'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\world.h(16): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1> Generating Code...
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
EDITS ROUND 2:
I switched my code around so the common.h only includes stdio and Allegro. All the header and source files include common.h and then any class's header file that they are using individually. Pane.cpp include Pane.h and common.h. World.h includes Pane.h and common.h.
Error log reads:
1>------ Build started: Project: MadScientist, Configuration: Debug Win32 ------
1> main.cpp
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(9): error C2061: syntax error : identifier 'World'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(10): error C2143: syntax error : missing ';' before '*'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(10): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(10): warning C4183: 'getWorld': missing return type; assumed to be a member function returning 'int'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(25): error C2143: syntax error : missing ';' before '*'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(25): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1> World.cpp
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(9): error C2061: syntax error : identifier 'World'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(10): error C2143: syntax error : missing ';' before '*'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(10): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(10): warning C4183: 'getWorld': missing return type; assumed to be a member function returning 'int'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(25): error C2143: syntax error : missing ';' before '*'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\pane.h(25): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\world.cpp(7): error C2661: 'Pane::Pane' : no overloaded function takes 5 arguments
1> Pane.cpp
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\world.h(16): error C2143: syntax error : missing ';' before '*'
1>c:\users\ethoma\documents\visual studio 2012\projects\madscientist\madscientist\world.h(16): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1> Generating Code...
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
This is how I see my include order now:
main includes common
common defines COMMON_INC
common includes stdio and allegro
main includes World.h
World defines WORLD_INC
World includes common, which is blocked. But this should be okay because common is already included
World includes Pane
Pane defines PANE_INC
Pane includes common, which is blocked. But this should be okay because common is already included.
Pane includes World. This is blocked because main already included World. Shouldn't this be okay since World was already included. Why do I even have compiler guards if I need to include files many times over, once for each file that uses it?
EDITS ROUND 3:
I have learned a lot from the answers and comments here. It turns out that, according to Wikipedia, "circular dependencies are often introduced by inexperienced programmers who need to implement some kind of callback functionality." The mere fact that Pane uses World and World uses Pane is a design flaw. In Java, this was all fine for me. It was very easy; I thought that this was the best way to notify the entity that "possesses" an object of the object's actions.
It turns out that this is a bad design scheme. Objects should not have dependencies to their "possessors". Instead, I need to implement a observer system, where the Pane can tell the World that it has updated its state.
Reading wikipedia cleared up any questions that I had, so I now consider this question finished. Thanks to the contributors for putting up for a learning programmer.

You header files cannot be possibly linked correctly. You included your headers in circular fashion. Your header files include common.h, while common.h in turn includes other headers, like World.h and Pane.h.
This is not compilable by any compiler. You have to develop a hierarchy of headers, from low-level headers to high-level headers and make sure that higher-level headers include only lower-level headers. That way you will make sure you have no circular inclusions.
Anyway, why does your common.h include World.h and Pane.h? This looks like an obvious error. common.h is intended to be a low-level header. Let World.h and Pane.h include it, but don't include World.h and Pane.h into common.h.
Note, that header guards do not solve anything in this case. They simply make sure that the inclusion cycle will not get infinite. They break the cycle, but they don't help you to resolve circular dependencies between declarations, if such dependencies exist.
Look what happens in your case when processing main.cpp
main.cpp includes common.h
common.h defines COMMON_INC
common.h includes World.h
World.h defines WORLD_INC
World.h includes common.h. The whole common.h is skipped by include guards, because COMMON_INC got defined at step 2.
World.h includes Pane.h
Pane.h defines PANE_INC
Pane.h includes common.h. The whole common.h is skipped by include guards, because COMMON_INC got defined at step 2.
Pane.h referred to type World. Type World is unknown, since we haven't gotten to its definition in World.h yet. Error!

I think everything will compile even with the circular includes, if you make the following changes
In common.h you need to rearrange order of headers.
#include <allegro5/allegro.h>
#include "World.h"
#include "Pane.h"
#include <stdio.h>
In pane.h, after the #include common.h, add a forward declaration for class World
#include "common.h"
class World;
class Pane{
.....
I think this will make your errors disappear or atleast decrease them substantially.
My answer is based on the original code you put up, not on the Edit.

Why C++ not know TIMESTAMP_STRUCT type?

I use Visual Studio 2005
When I compile, I get this error:
Error 1 error C2146: syntax error : missing ';' before identifier 'mDropEndTime'
Error 2 error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
struct MB_SYN_DROPITEM_UPDATE : MSGBUF
{
long mCid; // Index
unsigned long mItemIdx; // idx
TIMESTAMP_STRUCT mDropEndTime; // This is error line
};
Why doesn't C++ know TIMESTAMP_STRUCT?

TIMESTAMP_STRUCT is something defined in sqlext.h
You must add
#include <sqlext.h>

Because TIMESTAMP_STRUCT is not part of the C++ standard.