Const Char to LPTSTR

Question

I have looked for similar problems but none are in the context I require. The odd thing with this is that I get this error yet a different project set out in code the same way seems to work perfectly.

I am trying to load images into textures in openGL and have a function which takes in this parameter:

GLuint loadTexture(LPTSTR szFileName);

I then call it like this:

textureLib[0]= loadTexture("texturelib/texture1.bmp");
textureLib[1]= loadTexture("texturelib/texture2.bmp");
textureLib[2]= loadTexture("texturelib/texture3.bmp");
textureLib[3]= loadTexture("texturelib/texture4.bmp");

it then says "1>e:\usb\uni work\graphics\coursework\coursework\main.cpp(291): error C2664: 'loadTexture' : cannot convert parameter 1 from 'const char [24]' to 'LPTSTR'"

As stated above another program that I have seems to allow it so if there is a way of just fixing it to run it that would be appreciated :)

Answer 1

LPTSTR is either char* or wchar_t*, depending on whether Unicode macros are set (UNICODE, _UNICODE). And if you're passing literals to that function, you should not use it (and use LPCTSTR instead, which is const char/wchar_t*). After you change the signature, use _T() or TEXT() macro to match the literals to the type, i.e.

GLuint loadTexture(LPCTSTR filename);
loadTexture(TEXT("texturelib/texture1.bmp"));