Hey, how do I convert LPVOID to LPCSTR?

Code:
	LPCSTR configString;
	LPVOID readBuffer;
	HANDLE file = CreateFile("file://Media/Config/Config.ini", GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
	if (ReadFile(file, &readBuffer, 500, 0, NULL))
	{
		configString = (LPCSTR)readBuffer; //Convert don't work?
	}
The code above compiles, but it is not working.

Thanks,
VB6Learner