AfxIsValidString
Use this function to determine whether a pointer to a string is valid.
Syntax
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));
Requirements
Header: afx.h