[Mingw-users] [mingw - Windows API] undefined reference to `TransparentBlt@44'

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By: mrfelis

I hope someone can help me with this error. Any help would be appreciated.

Using this sample:

#define WINVER 0x500

#include <windows.h>
#include <wingdi.h>

int main() {
  HDC hDC, hMemDC;
  int x,y,w,h;
  UINT color;

  TransparentBlt(hDC, x, y,w,h, hMemDC, 0, 0,w,h ,  color);
}

First, I'm my C/C++ is really rusty. I haven't done any serious C development
since taking a VB position over 5 years ago.

I know remember enough to realise this is a linker error, and I've searched
all over the Web but alll I'm finding are instructions to include the library
msimg32.lib in a VC project.  Other than providing the proper libary it hasn't
helped. :(

I found the actual declaration of the function in the windgi.h file supplied
in w32api-2.4.tar.gz and I can compile with the -c flag, so I'm pretty sure
that the problem is in the library or my commandline.

Here's the commands that I've tried:

>g++ -mwindows -c sample.cpp <- generates sample.o so the code does compile

The following fail:
>g++ -mwindows -lmsimg32 sample.cpp
>g++ -mwindows -L c:\mingw\lib\libmsimg32.a sample.cpp
>g++ -mwindows -Lc:\mingw\lib\libmsimg32.a sample.cpp

The output is always this line:
C:\DOCUME~1\Rich\LOCALS~1\Temp/ccOGaaaa.o(.text+0x41):sample.cpp: undefined
reference to `TransparentBlt@44'

I'm using GCC:

Reading specs from C:/MinGW/bin/../lib/gcc-lib/mingw32/3.2.3/specs
Configured with: ../gcc/configure --with-gcc --with-gnu-ld --with-gnu-as
--host=mingw32 --target=mingw32 --prefix=/mingw --enable-threads --disable-nls
--enable-languages=c++,f77,objc --disable-win32-registry --disable-shared
--enable-sjlj-exceptions
Thread model: win32
gcc version 3.2.3 (mingw special 20030504-1)

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