Microsoft KB Archive/150764

= PRB: CString::LoadString Fails in Console Application =

Article ID: 150764

Article Last Modified on 11/21/2006

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APPLIES TO

 Microsoft Foundation Class Library 4.2, when used with:  Microsoft Visual C++ 2.0 Professional Edition

 Microsoft Visual C++ 2.1

 Microsoft Visual C++ 2.2

 Microsoft Visual C++ 4.0 Standard Edition</li></ul>

 Microsoft Visual C++ 4.1 Subscription</li></ul> </li></ul>

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This article was previously published under Q150764

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SYMPTOMS
CString::LoadString generates an MFC assert in debug mode console applications or fails in release mode console applications.

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CAUSE
CString::LoadString relies on MFC global resource handles that are initialized in AfxWinMain, which is only called in MFC GUI-based applications.

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RESOLUTION
The resource string is loaded using the Win32 API ::LoadString function. This method does not require any extra MFC initialization.

Example #1 below uses this method.

It is possible to initialize the MFC global resource handles by calling the undocumented AfxWinInit function. In this case, it is advisable to declare an instance of a CWinApp class.

Example #2 below demonstrates this method.

Sample Code - Example #1
/* Compile options needed: /MT */   #include <afx.h>   #include <stdio.h>   #include <conio.h>

#define IDS_HELLO 1

BOOL LoadStringResource(CString &cszString, UINT nID) {      int nSize = 0; int nLen = -1;

cszString.Empty;

//Keep looping until we have the whole string while ((nLen != 0) && (nLen == nSize - 1)) {          //Grow buffer by 256 bytes nSize += 256;

//Load String Resource nLen = ::LoadString( GetModuleHandle(NULL), nID,                               cszString.GetBuffer(nSize-1), nSize); }      cszString.ReleaseBuffer;

return (BOOL) nLen; }

void main(void) {      AfxInitialize;

CString cszString;

// IDS_HELLO is a string resource attached to the console application if (LoadStringResource(cszString, IDS_HELLO)) printf("The string was loaded\n%s\n", (LPCTSTR) cszString); else printf("Error loading string");

getch; }

Sample Code - Example #2
/* Compile options needed: /MT */   #include <afx.h>   #include <afxwin.h>   #include <conio.h>

#define IDS_HELLO 1

CWinApp theApp;

void main {      if (!AfxWinInit(GetModuleHandle(NULL), NULL, ::GetCommandLine, 0)) {          printf("Couldn't initialize MFC!\n"); return; }

CString cszString;

// IDS_HELLO is a string resource attached to the console application if (cszString.LoadString(IDS_HELLO)) printf("The string was loaded\n%s\n", (LPCTSTR) cszString); else printf("Error loading string");

getch; }

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STATUS
This behavior is by design.

Additional query words: 2.00 2.10 2.20 4.00 4.10

Keywords: kbprb KB150764

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