This seems like a pretty softball question, but I always have a hard time looking up this function because there seem there are so many variations regarding the referencing of char and tchar.
TCHAR is a Microsoft-specific typedef for either char or wchar_t (a wide character).
Conversion to char depends on which of these it actually is. If TCHAR is actually a char, then you can do a simple cast, but if it is truly a wchar_t, you'll need a routine to convert between character sets. See the function MultiByteToWideChar()
There are a few answers in this post as well, especially if you're looking for a cross-platform solution:
Although in this particular situation I think the TChar is a wide character I'll only need to do the conversion if it isn't. which I gotta check somehow.
if (sizeof(TCHAR) != sizeof(wchar_t))
{ .... }
The cool thing about that is both sizes of the equals are constants, which means that the compiler will handle (and remove) the if(), and if they are equal, remove everything inside the braces
Here is the CPP code that duplicates _TCHAR * argv[] to char * argn[].
If you adopting old code to Windows, simple use define mentioned in the code as optional.
You can put condition in your code
ifdef _UNICODE
{ //DO LIKE TCHAR IS WIDE CHAR } ELSE { //DO LIKE TCHAR IS CHAR }
I realize this is an old thread, but it didn't get me the "right" answer, so am adding it now.
The way this appears to be done now is to use the TEXT macro. The example for FindFirstFile at msdn points this out. http://msdn.microsoft.com/en-us/library/windows/desktop/aa364418%28v=vs.85%29.aspx
来源：https://stackoverflow.com/questions/159442/what-is-the-simplest-way-to-convert-char-to-from-tchar-in-c-cms