VC program prompts Expression :( "Buffer too small", 0) Error

Error:

An error is prompted when the VC program is running, but not every time.

Solution:

The call will fail if the string object itself is offered as a parameter to Format. For example, the following code:
CString str = "Some Data ";
Str. Format ("% d", str, 123); // Attention: str is also used in the parameter list.
Will cause unpredictable results.
To avoid this unpredictable problem, it is best not to take the string itself as a parameter of Format. You can define another CString variable:
Cstring str, strTmp;
StrTmp = "asd ....";
Str. format ("% s", strTmp );
This solves the problem.