You need to give it a buffer that can hold some characters; wchar_t buffer[MAX_PATH]; for example.

VS properly points out that you are using an uninitialized buffer - buffer var is a pointer to WSTR , but it has not been initialized with the s...

This is a general problem with the Win32 API, functions return strings into a buffer of a limited size and you are never sure if your buffer was la...

And, on a sidenote/addition to my answer below: Sometimes, you want to access a function size_t GetString(char* buf = NULL, size_t bufsize = 0);...

I also ran across that issue with trusting char pszPath[_MAX_PATH] being enough for ::GetModuleFilename() to work properly (it didn't!). So I t...

you may try this : { TCHAR szPath[MAX_PATH]; GetModuleFileName(NULL, szPath, MAX_PATH); }