Article ID: 154744 - View products that this article applies to.
This article was previously published under Q154744
The error below may occur in an MFC application where one of the following is assigned a value by the programmer:
The following error is displayed in a message box:
CWinApp::m_pszAppName CWinApp::m_pszRegistryKey CWinApp::m_pszExeName CWinApp::m_pszHelpFilePath CWinApp::m_pszProfileName
In Microsoft Visual C++ 6.0, the following error is displayed in a message box:
Debug Assertion failed Program: my.exe File: dbgheap.c Line: 1017 Expression:_BLOCK_TYPE_IS_VALID(pHead->nBlockUse)
You may see this error when you upgrade from an earlier version of Visual C++ to Visual C++ versions 4.2 or later.
Debug Assertion failed Program: my.exe File: dbgheap.c Line: 1011 Expression: _CrtIsValidHelpPointer(pUserData)
The CWinApp destructor in MFC included with Visual C++ 4.2 and later now frees the data assigned to the member variables shown above by passing the pointer to the free() function. Doing this prevents memory leaks, which would occur if an MFC regular DLL were dynamically loaded and unloaded.
If you assign a value to m_pszAppName, m_pszRegistryKey, m_pszExeName, m_pszHelpFilePath, or m_pszProfileName, the data must be dynamically allocated on the heap. You may want to use the _tcsdup() run-time library function to do this.
Also, free the memory associated with the current pointer before assigning a new value. Here is an example:
Article ID: 154744 - Last Review: November 21, 2006 - Revision: 4.1