MSVC keeps telling me that ParseNetworkString is undefined.
But I've done:
#include <Winsock2.h>
#include <Ws2tcpip.h>
#include <iphlpapi.h>
as expressed in the remark part of the docs
Thank you.
I've had a look inside "iphlapi.h" and it states (line 1287)
// app must include winsock2.h, ws2ipdef.h, and windns.h to use this API
So when I use
#include <WinSock2.h>
#include <ws2ipdef.h>
#include <WinDNS.h>
#include <iphlpapi.h>
ParseNetworkString becomes available.
So it seems you were on the right track, just missing the include of <WinDNS.h>
Related
I decided to try STL and use a vector instead of a custom made growable array class. The problem is that I can't get anything to compile. If I do something like this:
#include "stdafx.h"
#include <vector>
std::vector<PITEMID_CHILD> APIDL;
I get a bunch of messages similar to this:
1>c:\program files (x86)\microsoft visual studio\2017\enterprise\vc\tools\msvc\14.16.27023\include\cstdint(23): error C2039: 'int_least8_t': is not a member of '`global namespace''
If I change to this:
#include <vector>
#include "stdafx.h"
std::vector<PITEMID_CHILD> APIDL;
I get this:
1>x:\win32testing\vectortest\vectortest.cpp(4): error C2039: 'vector': is not a member of 'std'
Inside of stdafx.h is this:
#pragma once
#include <windows.h>
#include "targetver.h"
// C RunTime Header Files
#include <stdlib.h>
#include <malloc.h>
#include <memory.h>
#include <tchar.h>
#include <shlobj.h>
#include <exdisp.h>
#include <shellapi.h>
#include <shlwapi.h>
#include <atlbase.h>
#include <atlalloc.h>
#include <CommonControls.h>
// reference additional headers your program requires here
#include <CommCtrl.h>
Any idea what is going on?
From wikipedia documentation:
Visual C++ will not compile anything before the #include "stdafx.h" in the source file, unless the compile option /Yu'stdafx.h' is unchecked (by default); it assumes all code in the source up to and including that line is already compiled.
The best solution is to get rid of precompiled headers.
And for your C2039 error, it doesn't seem to be a result of line std::vector<PITEMID_CHILD> APIDL;. int_least8_t is a type defined in cstdint (stdint.h). It seems you haven't included this header file in your project.
As per CPP Doc, std::greater is defined in <functional> header but my C++ program using std::greater is compiling with TDM-GCC-64 5.1.0 and running with only the following includes :
#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <unordered_map>
It could be because <algorithm> automatically includes <functional> but since this is not mentioned in the doc, I was wondering is there a way to know this before hand ?
Just to close the topic, the conclusion is that this is implementation dependent and all the necessary headers should be included for portability.
I'm having a strange linking issue after I included inotify in my program to monitor changes to a filesystem. The project includes <fcntl.h> in many other source files. However, when I include <sys/inotify.h> in the source file which is doing the directory monitoring, I get this error:
/usr/include/fcntl.h:30:1: error: expected initializer before ‘extern’
__BEGIN_DECLS
My project uses CMake, although that doesn't seem to be relevant for finding inotify. It IS finding the inotify declarations to my knowledge, since when I included , it threw an error that inotify_init() and the other functions I used were not defined. Inotify includes fcntl and is partially built on top of some of the functionality there, so my first thought was that it's importing a different version of fcntl than the rest of my program.
In ObjectManager.h:
#ifndef MANAGE_OBJECT_H
#define MANAGE_OBJECT_H
#include "config.h"
//includes all lua headers under extern 'C'
#include <lua.hpp>
#include <list>
#include <unordered_map>
#include <pthread.h>
class ObjectManager //...
The only thing that changed was ObjectManager.cc, with the addition of sys/notify and the implementation of the watcher (not included because this is a linking issue):
#include "config.h"
#include "ObjectManager.h"
#include "Control.h"
#ifdef OBJECT_MANAGER_ENABLED
#include <string.h>
#include <stdio.h>
#include <dirent.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <vector>
#include <unistd.h>
#include <fstream>
#include <sys/inotify.h>
//... inotify implementation
Where Control.h declares #include <fcntl.h>.
This is the closest issue I found, related to some problems in the implementation of different fcntl headers for userspace usage. https://lkml.org/lkml/2008/9/16/98
The same problem occurs on Linux 2.6 running on Centos 6 and Linux 4.0 running on Centos 7.
Any ideas on what is causing this error and how to successfully include inotify?
Resolution: A function definition lacked a semicolon at the END of ObjectManager.h right before a #endif, and the resulting GCC error that propagated through the next includes in a complicated manner, resulting in a strange preprocessor error in fcntl.h.
I'm trying to create a combo box in Win32 by following this msdn tutorial.
When I implement step 2 and try to compile, I get the following error:
error: 'wcscpy_s' was not declared in this scope
wcscpy_s(A, sizeof(A) / sizeof(TCHAR), (TCHAR*)Planets[k]);
I've included the following header files, hoping to solve this issue:
#include <string.h>
#include <wchar.h>
#include <windows.h>
#include <CommCtrl.h>
#include <math.h>
#include <objbase.h>
Can someone help me understand why I'm getting this error? Thanks in advance.
From cpp-reference
As with all bounds-checked functions, wcscpy_s is only guaranteed to be available if STDC_LIB_EXT1 is defined by the implementation and if the user defines STDC_WANT_LIB_EXT1 to the integer constant 1 before including wchar.h.
I've included the following and it doesn't work :
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>
What to include for cv::meanShift function ?
it's in the video module, so:
#include <opencv2/video/video.hpp>
2 hours later I found the answer :)
For some reason #include can't be included directly so the following code will include the video module indirectly.
#include "opencv2/video/tracking.hpp"
#include "opencv2/video/background_segm.hpp"
Answer here : http://fossies.org/dox/opencv-2.4.9/video_8hpp.html