c++visual-studioresourcesstring-table

c++ visual studio resources


I am trying to implement a String Table in resource file .rc and then load specific string using function CString::LoadStringW(). This is the code main.cpp:

#ifndef _AFXDLL
#define _AFXDLL
#endif
#include <afx.h>
#include <stdio.h>
#include "resource.h"

int main()
{
    printf("Code Example: Load resource file data\n");

    CString sentence;
    sentence.LoadStringW(IDS_STRING101);
    printf("Sentence: %s", sentence);

    getchar();
    return 0;
}

There are already good links with description, how to use resource files as:

http://www.cplusplus.com/forum/windows/119338/

http://www.winprog.org/tutorial/resources.html

The problem is when I compile the code and then try to run, it does not read the string. When debuging, the line with LoadStringW() function throws an assertion error:

Debug Assertion Failed!

Program: C:\WINDOWS\SYSTEM32\mfc140ud.dll
File: f:\dd\vctools\vc7libs\ship\atlmfc\include\afxwin1.inl
Line: 24

For information on how your program can cause an assertion
failure, see the Visual C++ documentation on asserts.

In the end of the first URL I provided is (as last step) to link compiled resource file .rc and my source file main.cpp. I am not sure how to do this and perhaps this is why my program does not work as expected.

Please, do you have any recommendations?

I am trying on MSVS 2015 / 2017.

Thanks.


Solution

  • After a while, I am still not able to explain why code posted in question does not work. However for reading a string resource from String Table I used different function LoadString() and finally made it work which is actually NOT part of CString class.

    The problem with NULL resource handler is solved by getting a handle to the running .exe file which contains these resources (good tool to verify which resources are included is e.g. Resource Hacker) - done with GetModuleHandle(NULL)

    Below is the working code snippet.

    main.cpp:

    #include <afx.h>
    #include <stdio.h>
    #include "resource.h"
    #define BUF_SIZE 50
    
    int main(void)
    {
        printf("Code Example: Load resource file data\n");
    
        wchar_t buffer[BUF_SIZE];
    
        if (!LoadString(GetModuleHandle(NULL), IDS_STRING104, buffer, BUF_SIZE))
        {
            printf("Error Loading String: IDS_STRING104\n");
        }
        else
        {
            printf("resource string: %ls\n", buffer);
        }
    
        getchar();
        return 0;
    }
    

    resource.h:

    #define IDS_STRING103                   103
    #define IDS_STRING104                   104
    

    Resource.rc:

    #include "resource.h"
    
    STRINGTABLE
    BEGIN
        IDS_STRING103           "Resource 103 sentence"
        IDS_STRING104           "Resource 104 sentence"
    END
    

    Here are some references, which were useful to me:

    How to get my own code's module handle?

    https://msdn.microsoft.com/en-gb/library/windows/desktop/ms647486.aspx