AfxIsValidString
Visual Studio .NET 2003
Use this function to determine whether a pointer to a string is valid.
BOOL AfxIsValidString( LPCSTR lpsz, int nLength = -1 );
Parameters
- lpsz
- The pointer to test.
- nLength
- Specifies the length of the string to be tested, in bytes. A value of –1 indicates that the string will be null-terminated.
Return Value
In debug builds, nonzero if the specified pointer points to a string of the specified size; otherwise 0.
In non-debug builds, nonzero if lpsz is not NULL; otherwise 0.
Example
// Create a character string which should be valid. char str[12] = "hello world"; // Create a null pointer, which should be an invalid string. char *null = (char *)0x0; ASSERT(AfxIsValidString(str, 12)); ASSERT(!AfxIsValidString(null, 5));
See Also
MFC Macros and Globals | AfxIsMemoryBlock | AfxIsValidAddress
