Visual Studio 2015. I am reading the "Windows via C\C++" book and try to use its code samples. Author writes that the "safe" functions of string have the _s suffix and are declared in the StrSafe.h header. This header are to be the last in the list of includes. In my code I included such headers:
#include <iostream>
#include <exception>
#include <string>
#include <Windows.h>
#include <strsafe.h>
But I have a problem:
// IDE doesn't see the _tcscpy_s function
errno_t result = _tcscpy_s(szBuffer, _countof(szBuffer), TEXT("0123456789"));
I looked for info about the _tcscpy_s function, but I didn't see info about its header file (I expected that it is strsafe.h).
How can I fix it?
Just like any other "Generic Text" string function version, the _tcscpy_s() function is declared in TCHAR.H (as mentioned in the documentation).
Add #include <tchar.h> to your code.
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.
I am using Visual Studio Community 2017 to code c++. When I run the following code everything works fine.
#include "pch.h"
#include<Windows.h>
#include<Psapi.h>
#include <iostream>
#include <conio.h>
int main()
{
std::cout << "Really!! How do you do it?";
_getch();
}
But if I change the order of #includes by including psapi.h before Windows.h, compiler goes badass and throws 198 errors at me, which surprisingly(maybe only to me) includes Identifier "BOOL" is undefined.
Why is this happening?
Since Psapi.h's include tree is trivial, I'm going to exemplify. Everything relies on VStudio 2015 (Community) (v14.0.25431.01 Update 3) and Windows Kits 8.1 (? funny, because v10 is there too) files (with default env vars and preprocessor definitions):
BOOL is defined in minwindef.h (#157: typedef int BOOL;)
Psapi.h only includes one file (#27: #include <winapifamily.h>)
winapifamily.h doesn't include any other file
So, when reaching Psapi.h (#87: BOOL WINAPI EnumProcesses (...), the compiler doesn't know anything about BOOL, so it complains.
Windows.h includes minwindef.h (indirectly, via windef.h), and that's why it works when you include it before Psapi.h.
Personally, I think it's a bug in Psapi.h, since it's not self contained, but there might be a good reason (that I'm not aware of) for that. Anyway, if this is indeed a bug, it wouldn't be MS's 1st one :)
#include <Windows.h>
#include <WinSock2.h>
// main present just for rigorosity's sake
int main() {
return 0;
}
to answer the question, I know this is DATED but the issues persist today. You need the following:
#include "stdafx.h"
#include <stdbool.h>
#include <Windows.h>
#include <stdlib.h>
#include <psapi.h>
After stdlib.h was included, the errors were gone.
I can litterally not find which library/header this function is in, I've looked at so many examples of people using this function, but there are no results...
These are all the stuff I've included:
#include "Console.h"
#include "Direct3D9.h"
#include <string>
#include <cerrno>
#include <cstdlib>
#include <iostream>
#include <algorithm>
#include <math.h>
#include <cmath>
#include <stdio.h>
#include <stdlib.h>
But still strtof comes up as "Error namespace "std" has no member "strtof""
What I'm trying to do:
flValue = std::strtof( vszArgs.at( 1 ).c_str( ), NULL );
pConVar->Set( flValue );
Visual Studio 2012 does not implement strtof.
Link to MSDN bug report which includes a suggested workaround.
You can find it in cstdlib when using C++11. The information can easily be found here : http://www.cplusplus.com/reference/cstdlib/strtof/?kw=strtof
My guess is that you aren't compiling using c++11.
1) Include stdlib.h
#include <stdlib.h> /* strtof */
from http://www.cplusplus.com/reference/cstdlib/strtof/
If that still doesn't work...
2) Make sure your compiler is C++11 or newer
It's new as of C++11 so if you have an older compiler it won't work.
If that still doesn't work...
3) Your compiler may just not support it
Visual C++ 2012 does not have full support for the C++11 standard. See the Visual Studio bug "Missing strtof, strtold, strtoll, strtoull functions from stdlib.h".
We don't yet have those functions in the CRT. We will consider adding them to a future version of Visual C++.
I am not able to compile my program SHGetSpecialFolderPath() not being declared in the scope of the program, while the correct header is being included (according to MSDN)
http://msdn.microsoft.com/en-us/library/bb762204(v=vs.85).aspx
Here are the headers for my project:
#include <iostream>
#include <iostream>
#include <windows.h>
#include <algorithm>
#include <vector>
#include <fstream>
#include <direct.h>
#include <shlobj.h>
With error:
C:\Users\user\Documents\getAppData\main.cpp|31|error: `SHGetSpecialFolderPath' was not declared in this scope
with shlobj.h being the header with the declaration in it.
Any ideas why the compiler is throwing the error? Here is how I am calling the function:
char appData[MAX_PATH];
SHGetSpecialFolderPath( NULL
,appData
,CSIDL_LOCAL_APPDATA
,1 );
cout << appData << endl;
Thanks!
From the MSDN page:
The Microsoft Internet Explorer 4.0
Desktop Update must be installed for
this function to be available.
With Windows 2000, this function is
superseded by ShGetFolderPath. You can
use this function on earlier systems
by including the redistributable DLL,
ShFolder.dll.
Perhaps this is your problem?
I'm trying without any luck to include strings in my C++ Win32 API beginner project. The code won't compile if I define a string. What's going on?
Details:
I was working in Dev C++, but now have switched to Code::Blocks using the (default?) "Gnu GCC Compiler".
Here are the code cases I have tried, all similar, with their results:
Compiles successfully:
#include <windows.h>
#include <string.h> //<string> throws "no such file or directory"
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
//...the rest works perfectly, omitted in following examples
Fails:
#include <windows.h>
#include <string.h>
// Error: "string" does not name a type
string myString;
// ...WndProc
Compiles successfully:
#include <windows.h>
#include <string.h>
using namespace std;
// ...WndProc
Fails:
#include <windows.h>
#include <string.h>
using namespace std;
// Error: "string" does not name a type
string myString;
// ...WndProc
Fails:
#include <windows.h>
#include <string.h>
// Error: expected constructor, destructor, or type conversion before "myString"
// Error: expected ',' or ';' before "myString"
std::string myString;
// ...WndProc
I asked this question a few days ago but deleted it because it seemed like a dumb question. However, it wasn't solved and now has come back to haunt me. Thanks in advance.
Does the source file have a .cpp extension? If it's .c, it will compile as C code, which probably excludes the directories containing the standard C++ headers.
#include <string.h> //<string> throws "no such file or directory"
Something is seriously broken with either your compiler installation or your use of it. Whatever comes after this, not being able to include the header for std::string is going to make it very difficult to use one.
You can install the GCC suite without C++ support, maybe that's your problem.
<string.h> contains ANSI C string macros and function declarations (see here) , not the C++ string. To use std::string, you need to do
#include <string>
(no .h)
#include <windows.h>
#include <string>
std::string myString;
string.h has only methods to handle the string. For example, strcpy, strlen etc... (http://opengroup.org/onlinepubs/007908799/xsh/string.h.html)
If you want to use std::string, you should use .
If there is no file, check that file.
Good luck :)