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From: Dan Kegel <dank AT kegel DOT com>
Date: Sat, 13 May 2017 08:34:14 -0700
Message-ID: <CAPF-yOa3R1ghm-rKOcjtMpFtQWXpJRi42x90ZJd1GBZ6HeBUSA@mail.gmail.com>
Subject: Re: BUG: winmain GetCommandLine only returning program name and path with no arguments
To: mikebarry AT gmail DOT com, cygwin AT cygwin DOT com
Content-Type: text/plain; charset="UTF-8"

That same executable behaves properly when built with cl.exe *or* run from cmd.

Only when built with cygwin gcc *and* run from cygwin shell does it
not show the full string,
and bonus, in that case does not set szCmdLine properly?

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

int WINAPI
WinMain(HINSTANCE hInst, HINSTANCE hPrev, LPSTR szCmdLine, int sw) {
        char* text = GetCommandLine();
        printf("getcmdline: %p %s\n", text, text);
        printf("szCmdLine: %p %s\n", szCmdLine, szCmdLine);
        return 0;
}

Built as a.exe by gcc, example.exe by cl

$ ./a.exe x y z
getcmdline: "C:\cygwin64\home\buildbot\a.exe"
szCmdLine:

$ ./example.exe x y z
getcmdline: C:\cygwin64\home\buildbot\example.exe x y z
szCmdLine: x y z

$ cmd
Microsoft Windows [Version 10.0.10240]
(c) 2015 Microsoft Corporation. All rights reserved.

C:\cygwin64\home\buildbot>a.exe x y z
getcmdline: a.exe  x y z
szCmdLine: x y z

C:\cygwin64\home\buildbot>example.exe x y z
example.exe x y z

C:\cygwin64\home\buildbot>getcmdline: example.exe  x y z
szCmdLine: x y z

(Incidentally,
http://stackoverflow.com/questions/13871617/winmain-and-main-in-c-extended/13872211
and
http://daviddeley.com/autohotkey/parameters/parameters.htm looks
like informative if one is interested in some nasty details. )

On Sat, May 13, 2017 at 7:30 AM, Mike Barry <mike DOT barry AT gmail DOT com> wrote:
> Below is a sample program that demonstrates that the GetCommandLine
> function is not returning the command line arguments.  I attached
> cygcheck.out.
>
> #include <windows.h>
> #include <stdio.h>
>
> int WINAPI
> WinMain(HINSTANCE hInst, HINSTANCE hPrev, LPSTR szCmdLine, int sw) {
>         char* text = GetCommandLine();
>         printf("getcmdline: %s\n", text);
>         return 0;
> }
>
> gcc test_wmain.c -o test
>
> $ ./test hello world
> getcmdline: "C:\cygwin64\home\mbarry\game-repos\greenbeam\src\test.exe"
>
>
> --
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