error C2018: unknown character 0x13 (which is DC3 in ascii) - c++

While compiling some C++ code in VS2013 I got this error and this is the first time I have seen it also.
When I click the error message it refers to a specific line in sal.h header, which is:
// buffer capacity is described by a complex expression
#define _Out_z_cap_x_(size) _SAL1_1_Source_(_Out_*Ÿö Ÿ(ôÜ_Øize), _Pre_cap_x_(size) _Post_valid_impl_ _Post_z_)
I wonder how to resolve this issue?

Related

C++ no 'object' file generated

This is some code to get an environment variable from inside Qt, however, it seems Qt's QProcessEnvironment::systemEnvironment() only reflect a new environment variable change after reboot. So I am thinking about using getenv.
However I got "error C2220: warning treated as error - no 'object' file generated" from this :
QProcessEnvironment env = QProcessEnvironment::systemEnvironment();
const QString ENGINE_ROOT = env.value("ENGINE_ROOT", "") != "" ?
env.value("ENGINE_ROOT","") : QString(getenv("ENGINE_ROOT"));
Don't tell me something like disable /WX or lower W4 to W3, I don't want to hear this, I want to know exactly what cause
no 'object' file generated
.
"error C2220: warning treated as error - no 'object' file generated"
The error already answers your question:
A warning was generated.
Because you have told the compiler to treat warnings as errors, an error occurred.
Because an error occurred, the compiler did not generate an object file.
If you want to know what the original warning means, then you need to ask us about that warning.
I just had this problem. The real source of the confusion is that Microsoft Visual Studio lists the
error C2220: warning treated as error - no 'object' file generated
line separately from the warnings--sometimes even before the warnings--so it is not immediately apparent that the error is related to the listed warnings.
Fix all warnings listed to fix this problem.
I'll address the underlying question instead of the compilation problem.
Environment variables for any process are copied from those of its parent process when your new process is started. From that point, the only thing that can modify them is your process yourself.
In practical terms, this means that going to the Windows dialog box to change environment variables does not change those values for any existing processes. Those changes are applied to the explorer.exe process, and then any new processes launched from Explorer.
There is a possible way for a Windows application to get notified of changes made to environment variables made by Explorer. See How to modify the PATH variable definitely through the command line in Windows for details.
in my case, eliminating all useless 'object' will deal this erro

Strange Error C2065: 'ERROR' : undeclared identifier

As part of a bigger project ( the ff activex plugin for Mozilla Firefox) there is this code snippet:
if (CombineRgn(hrgnClip, hrgnClip, hRGN, RGN_AND) != ERROR)
{
::InvalidateRgn(m_hWndParent, hrgnClip, fErase);
}
When I build in VS2012 I get "Error C2065: 'ERROR' : undeclared identifier"
ERROR is defined in wingdi.h like this:
...
/* Region Flags */
#define ERROR 0 // it wont build when this macro is used
#define NULLREGION 1 // it builds when this macro is used
#define SIMPLEREGION 2
#define COMPLEXREGION 3
#define RGN_ERROR ERROR
...
The strange thing is that if I replace ERROR (just to see if it builds OK) with NULLREGION or SIMPLEREGION (which are macros in the same file, just two lines below the offending one) in the if statement above, the code builds OK. When I use ERROR, the code wont build.
Is it possible that the ERROR macro defined above gets masked by some keyword or another macro or some such by Visual Studio?
The problem here is that ERROR actually appears in the compile error message. That should not happen, the preprocessor should have substituted it with 0.
So somewhere in a .h file you #included after windows.h, some programmer took the 10 second shortcut to a macro name collision problem and wrote this:
#undef ERROR
You'd need to find that line and remove it. That's likely to be difficult and liable to give you a maintenance headache since that's a file you don't own and might well be updated in the future, forcing you to make that change over and over again. The alternative is to redefine it yourself:
#define MYGDIERROR 0
...
if (CombineRgn(hrgnClip, hrgnClip, hRGN, RGN_AND) != MYGDIERROR)
//etc...
Which still gives you a maintenance problem and requires you taking a bet that the return value definition of CombineRgn() is never going to change. That's a very safe bet, GDI is cast in stone.

C++ Weird error. Fails to compile

I have been using the allegro 5 libraries for developing a game in C++ for some time. Today I got some weird error:
I have a class called level. I have a header file called levelhandler.
Here's how it looks:
#pragma once
#include "level.h"
level level_1;
level *currentlevel;
void initialize_levels()
{
currentlevel = &level_1;
}
When I try to compile it gives me strange errors like:
error C2086: 'int level' redefinition
error C2143: syntax error : missing ; before 'level_1'
I remember that it could compile before, and I did use currentlevel->Player.X a lot of times, but now I have a lot of that and it gives errors like these:
error C2227: left of '->Player' must point to a class/struct/generic type
error C4430: missing type specifier - int assumed
header pasted from comment
#pragma once
#include "entity.h"
// some more includes
class level {
public:
enum Tileset { ... };
enum Tile { ... };
int tiles[200][200];
player Player;
level(void);
~level(void);
};
Such errors are hard to find as long as you look at the "Error List" pane. Select View/Output to show the "Output" view. The line after the error C2086 shows the original definition of level.
You fill find an
int level;
there as the C2086 tells you. If it's the line
level level_1;
of your fist example you will have to check the last header file include in your compilation unit. It might end with an int or it has a unbalanced #if clause.
To find the exact location start using a Short, Self Contained, Correct (Compilable), Example. This helps you to find the bug and saves time of other with their crystal balls.
Edit:
Another way to find the reason for this unexpected behavior is to see the preprocessor output. Set the Generate Preprocessed File option int the C/C++/Preprocessor project property page to With line numbers (/P) and look in the generated <sourcefile>.i
Check that that level.h file has included what you intended.
Ok, so I've been tinkering around with my project the weekend, and I finally found out what whas the problem that gave me so many weird compiler errors. It seems that I had a lot of cases where two header files were including each other, and the compiler really didn't like that, so I corrected that, and now I'm ok. Thank you all for helping me, and have a great day!

Strange output and branch warning when compiling

I compile a fortran 77 code using gfortran and get the following error:
10 open (23,file=outfile,status='old',access='append',err=10)
1
Warning: Branch at (1) may result in an infinite loop
This happens several times.
One of the output files looks like the following:
^L6a10È <90> ) &<9b>LÓLÓLÕ<91><90> <90> <90> È <8e><9b>LÓLÓLÕ<93>2
!MERCURY ¢¤õ/!ô<8a><8a><90> ÿ<90> ÿ<90> ÿÌÖÏ©ü}M<91>
"VENUS «}>±{©±<8b><90> ÿ<90> ÿ<90> ÿʺ93¿<8d>d<91>
However, it should just look like a table of text.
Any ideas?
Your line of code
10 open (23,file=outfile,status='old',access='append',err=10)
specifies that the open statement should transfer control to itself (label 10) in case an error is encountered, so any error could trigger an infinite loop. It also suppresses the output of error messages. If you want to just check for an error status, I would suggest using the iostat and/or iomsg (Fortran 2003) arguments:
open (23, file=outfile, status='old', access='append', iostat=ios, iomsg=str)
Here ios is an integer that will be zero if no errors occur and nonzero otherwise, and str is a character variable that will record the corresponding error message.
The err= argument in your open statement specifies a statement label to branch to should the open fail for some reason. Your code specifies a branch to the line labelled 10 which happens to be the line containing the open statement. This is probably not a good idea; a better idea would be to branch to a line which deals gracefully with an error from the open statement.
The warning from gfortran is spot on.
As to the apparent garbage in your output file, without sight of the code you use to write the garbage (or what you think are pearls perhaps) it's very difficult to diagnose and fix that problem.

Visual Studio not recognizing certain classes

I keep getting the error:
error C2146: syntax error : missing ';' before identifier 'mCameraFrame'
for the line of code:
Frame mCameraFrame;
So clearly my frame class isn't being found somehow. I have the frame.h header file (which defines the Frame class) directly included in this file. Why doesn't visual studio recognize it?
The error is coming from previous lines of code, possibly in a header file.
For example:
struct foo
{
int a;
}
Frame mCameraFrame;
Notice the missing ; after the }? That makes the Frame legal as an instance of the structure, but now there's a missing ; before mCameraFrame, resulting in the kind of error you reported.
The compiler can't report a missing ; after the } because it has no way to know there's supposed to be one there, since the Frame that comes after it is perfectly legal.
It's not unusual for a single missing ; or missing } to result in errors reported many lines later than the actual problem, sometimes hundreds of them.
Figured I'd report back to anyone that's interested. The problem was that the Frame class that was supposed to be definining mCameraFrame was in a different namespace, so all I had to do was "using namespace ....;". Doh! :P