BOOL AfxIsValidString( LPCSTR lpsz, int nLength = -1 );
Return Value
Nonzero if the specified pointer points to a string of the specified size; otherwise 0.
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.
Remarks
Use this function to determine whether a pointer to a string is valid.
See Also AfxIsMemoryBlock, AfxIsValidAddress