Win API doesn't working

[WhiteHat]

Hi everybody,
I have problem with Win API programming in Code::Blocks. I typed really easy Win API source code, Code::Blocks compiled it and made an .exe file. But this file can't be execute. Can You help me pls?

Code, I've typed:

Code

#include <windows.h>
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,
                                PSTR szCmdLine, int iCmdShow)
{
     MessageBox(NULL, TEXT("Ahoj světe"), TEXT("Programujeme"),0);
     return 0;
}

[Michael]

Hello,

Which C::B revision? Compiler? Not MinGW, because it does not compile you code .

Which errors did you get?

Best wishes,
Michael

[MortenMacFly]

I have problem with Win API programming in Code::Blocks.

A few more details would be nice:
- What C::B version are you using?
- What compiler are you using?
- What was your template? (A Windows GUI application, a console application, a file-only)?
- (In case of MSVCTK): do you link against gdi32.lib user32.lib kernel32.lib?
- (In case of GCC): do you link against gdi32 user32 kernel32 windows?
With regards, Morten.
BTW: If you remove your message box it compiles/runs fine for me (with MSVCTK and GCC).
Edit: Ooops, Michael was a few seconds faster than I - but we share the same questions... ;-)

[Michael]

Edit: Ooops, Michael was a few seconds faster than I - but we share the same questions... ;-)

But your questions are much more precise and detailed .

Best wishes,
Michael

[WhiteHat]

Well guys, thanks a lot, but I think, I have resolved this problem, as You've said, problem is with compiler (Mingw) Now I had dowbloaded Win32 compiler and everything is OK, only: I have to set build option in every project, how could I set it automaticly?

[Michael]

Well guys, thanks a lot, but I think, I have resolved this problem, as You've said, problem is with compiler (Mingw) Now I had dowbloaded Win32 compiler and everything is OK, only: I have to set build option in every project, how could I set it automaticly?

You did build an .exe with MinGW :?? Strange, because MinGW seems not to support WinMain AFAIK (but I may be wrong).

Compiler Options could be set globally for every projects under:

Settings-->Compiler and debugger-->Global compiler settings.

Or locally (for the whole project or for every target) under:

Project-->Build options

Best wishes,
Michael

[TDragon]

Strange, because MinGW seems not to support WinMain AFAIK (but I may be wrong).

Unless I've completely misunderstood you, you are wrong.

The code as posted fails to compile for me, because my default encoding doesn't support the non-ASCII characters; however, if I replace them with something harmless everything compiles and executes cleanly.

WhiteHat: Does it work when debugging from Code::Blocks (hit F8)? What exactly happens or doesn't happen when you try to run the executable?

[sethjackson]

MinGW supports WinMain for sure.  Umm why would you think otherwise :?

[WhiteHat]

Compiler is fine. No error message while compiling, but .exe file can't be runed. I don't know what type of project have I choose.

If I try to run .exe file, there will be console window for a while and nothing happens.

[David Perfors]

looks like you have choosen a console application. Go to the Project settings and change the application type to GUI application.

[Michael]

Strange, because MinGW seems not to support WinMain AFAIK (but I may be wrong).

Unless I've completely misunderstood you, you are wrong.

Hmmm. When compiling I got the same problem as here:

http://forums.codeblocks.org/index.php?topic=3374.0

May be I have forgotten to add a library or two.

Best wishes,
Michael

[Vampyre_Dark]

MinGW always supported WinMain for me. You just add -mwindows or something.  :| :?

[thomas]

The reason it fails is that you use illegal byte sequences ("Ahoj světe") which somehow screws up the compiler.

If you save the document as UTF-8, it compiles just fine. As an alternative, you could tell gcc to use a different encoding.

[sethjackson]

MinGW always supported WinMain for me. You just add -mwindows or something.  :| :?

Uhh I never had to do that either.....  :? Look in the C::B Win32 GUI template. You need to link gdi32, user32, and kernel32. There is no -mwindows to be found. Of course you have to include <windows.h>, and for MinGW you must download the winapi package for things to work.

@Michael

Umm that topic was talking about wmain not WinMain. The entry point for GUI (console apps don't count) apps on Windows is WinMain.

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/winui/windowsuserinterface/windowing/windows/windowreference/windowfunctions/winmain.asp

[thomas]

The only real problem with this code snippet is that it is not properly encoded.

If you paste it into an empty document and save with "default encoding" (which is Windows-something) then it fails to compile on my  machine, too. However, if you save the exact same file with UTF-8 encoding, all is fine.

This makes sense, too, since gcc uses UTF-8 as default encoding (unless told otherwise), and ět in Windows-something is not valid in UTF-8.
The only thing that is not quite right about it is that gcc does not report this as "illegal sequence" but simply fails silently, outputting an emtpy object file (which of course misses the WinMain function, as the linker correctly complains about).

Regarding main/WinMain, much to everybody's surprise MinGW is smart enough to wrap up everything so it still works, even if you use main instead of WinMain for a Windows application. The only obvious disadvantage is that you don't have easy access to hInstance and hPrevInstance, but they can be queried if needed (and who needs them anyway).