GCC, C-project and GDI+

Asked Dec 20 '14 at 12:10

Active Dec 20 '14 at 12:35

Viewed 1,474 times

So, I have project written on C and need to draw PNG in the window created by the WinApi. I decided to use GDI+ and to create one c++ source file, linked to general project. There it is:

#include <windows.h>
#include <gdiplus.h>
#include <stdio.h>

using namespace Gdiplus;

void drawPNG (HWND hwnd, unsigned xpos, unsigned ypos, char * rid) {

    PAINTSTRUCT ps;
    HDC dc = BeginPaint (hwnd, &ps);

    GdiplusStartupInput gdiplusStartupInput;
    ULONG_PTR gdiplusToken;
    GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);

    Rect rect(20,20,50,50);
    Graphics grpx(dc);
    Image* image = new Image(L"SomePhoto.png");
    grpx.DrawImage(image,rect);

    delete image;

    GdiplusShutdown(gdiplusToken);

    EndPaint(hwnd, &ps);

}

I try to compile it with:

gcc -lstdc++ -x c++ img_drawing.c -lgdiplus -mwindows

And got these errors:

img_drawing.o:img_drawing.c:(.text+0x5d): undefined reference to `GdiplusStartup@12'
img_drawing.o:img_drawing.c:(.text+0x105): undefined reference to `GdiplusShutdown@4'
img_drawing.o:img_drawing.c:(.text$_ZN7Gdiplus11GdiplusBasenwEj[__ZN7Gdiplus11GdiplusBasenwEj]+0xfffffa09): undefined reference to `GdipAlloc@4'

But if I try to use g++, it builds without errors:

g++ img_drawing.c -lgdiplus -mwindows

I use MinGW compiler on Windows 7. Any idea why it's compiling with errors with the first command?

edited Dec 20 '14 at 12:35

Heskja

asked Dec 20 '14 at 12:10

`gcc` is the c-compiler, do you have plain c-code? No. – πάντα ῥεῖ Dec 20 '14 at 12:17
No, I have C++ code, but gcc can compile c++ code with special flags (-x c++). If I remove GDIPlus functions it builds without errors. – Dec 20 '14 at 12:22
Looks like the `libgdiplus.a` was created using `g++`. – πάντα ῥεῖ Dec 20 '14 at 12:24
What should I do? Recompile libgdiplus? – Dec 20 '14 at 12:26
_"Recompile libgdiplus?"_ Should help. – πάντα ῥεῖ Dec 20 '14 at 12:27
I dont know how) Where can I found sources? – Dec 20 '14 at 12:27
Well, what's wrong about just using `g++`, as long this works? – πάντα ῥεῖ Dec 20 '14 at 12:29
But I have Pure C project, I dont want to write on C++. It's very big differences for me. – Dec 20 '14 at 12:31
The source provided is C++. You say you don't want to write C++ but you already are. – Colonel Thirty Two Dec 20 '14 at 12:39
2

In theory you should be able to *compile* your c files with gcc and your c++ files with g++ and then use g++ linker to bring them altogether.Doing a quick search I found an [SO Answer](http://stackoverflow.com/a/5430720/3857942) that may be able to point you in the right direction – Michael Petch Dec 20 '14 at 12:39
Thank you very much, I'll read it. – Dec 20 '14 at 13:48
Possible duplicate of [Compiling C and C++ files together using GCC](http://stackoverflow.com/questions/5430688/compiling-c-and-c-files-together-using-gcc) – Armali Feb 13 '17 at 13:20

GCC, C-project and GDI+

0 Answers0