I'm using the most recent version of Dev-cpp, and i found that BITMAPV5HEADER is not defined in my WINGDI.h .

Why? What to do now?

It is defined in the Wingdi.h of Visual c++ 6.00 but not in the Wingdi.h of DEV-CPP or MingW Developer Studio

I'm afraid I don't know why Dev-C++ dosn't define the struct for you, but in regard to solving it, why don't you borrow the definition off MSDN?
http://msdn.microsoft.com/library/de...tmaps_7c36.asp

because WINGDI.h is not a standard header and there is no requirement that different compilers define the same stuff in non-standard headers.

Use VC++6 because the code was probably written with the extensions only VC has. DevC either:
1) has a different way to accomplish the same task
2) or it cannot accomplish the task because it wasn't designed into the compiler


What good would this do without the supporting code library?

is BITMAPV5HEADER important? I used instead BITMAPV4HEADER. I think it is rarely used by developers using Dev-cpp

Well, considering that firstly BITMAPV5HEADER is simply an extension of the structs BITMAPV4HEADER and BITMAPINFOHEADER, and the fact that the same functions use any of those depending upon which Windows version the program is running on, I'd say that the actual libraries aren't a big problem. Even if he didn't have the Win32 GDI static library, he could dynamically link his application to gdi32.dll.