X-Received: by 10.224.57.65 with SMTP id b1mr1346922qah.2.1371362154274; Sat, 15 Jun 2013 22:55:54 -0700 (PDT)
X-Received: by 10.49.24.208 with SMTP id w16mr260464qef.37.1371362154239; Sat, 15 Jun 2013 22:55:54 -0700 (PDT)
Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!news.glorb.com!bw2no1851673qab.0!news-out.google.com!y6ni2993qax.0!nntp.google.com!j2no352849qak.0!postnews.google.com!glegroupsg2000goo.googlegroups.com!not-for-mail
Newsgroups: comp.os.ms-windows.programmer.misc
Date: Sat, 15 Jun 2013 22:55:54 -0700 (PDT)
In-Reply-To: <d0bc4f37-5302-496a-aab1-088c75262034@googlegroups.com>
Complaints-To: groups-abuse@google.com
Injection-Info: glegroupsg2000goo.googlegroups.com; posting-host=2.177.114.176; posting-account=qc51SAoAAAASmnHqyXwbmcAUkjDP4HPo
NNTP-Posting-Host: 2.177.114.176
References: <d0bc4f37-5302-496a-aab1-088c75262034@googlegroups.com>
User-Agent: G2/1.0
MIME-Version: 1.0
Message-ID: <0eac2ee9-502e-49c2-878c-77fe9103c46f@googlegroups.com>
Subject: Re: Simplest possible C win32 app to draw line?
From: moosavi78@gmail.com
Injection-Date: Sun, 16 Jun 2013 05:55:54 +0000
Content-Type: text/plain; charset=ISO-8859-1
Xref: csiph.com comp.os.ms-windows.programmer.misc:24

On Sunday, June 17, 2012 1:33:51 AM UTC+4:30, Dan Kegel wrote:
> What is the absolute simplest win32 program that draws a line in a window?
> 
> 
> 
> I tried
> 
> 
> 
> #include <windows.h>
> 
> int WINAPI WinMain(HINSTANCE hinst, HINSTANCE hinstPrev, LPSTR lpCmdLine, int nShowCmd)
> 
> {
> 
>     MSG msg;
> 
>     HWND hwnd;
> 
>     HDC hdc;
> 
>     RECT rect;
> 
>     WNDCLASS wc;
> 
> 
> 
>     ZeroMemory(&wc, sizeof(wc));
> 
>     wc.lpfnWndProc = DefWindowProc;
> 
>     wc.hInstance = hinst;
> 
>     wc.hCursor = LoadCursor(NULL, IDC_ARROW);
> 
>     wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
> 
>     wc.lpszClassName = "Foobar";
> 
>     RegisterClass(&wc);
> 
>     hwnd = CreateWindow(
> 
>         "Foobar",
> 
>         "Foobar",
> 
>         WS_OVERLAPPEDWINDOW,
> 
>         CW_USEDEFAULT, CW_USEDEFAULT,
> 
>         512, 512,
> 
>         NULL,
> 
>         NULL,
> 
>         hinst,
> 
>         0);
> 
>     hdc = GetDC(hwnd);
> 
>     GetClientRect(hwnd, &rect);
> 
>     FillRect(hdc, &rect, (HBRUSH) (COLOR_WINDOW+1));
> 
>     MoveToEx(hdc, 100, 100, NULL);
> 
>     LineTo(hdc, 200, 200);
> 
>     ReleaseDC(hwnd, hdc);
> 
>     ShowWindow(hwnd, nShowCmd);
> 
>     Sleep(5000);
> 
>     return 0;
> 
> }
> 
> 
> 
> but the window was not shown.  Is the problem that I
> 
> don't have a window proc?  I was hoping I could just
> 
> draw immediately without having to use the event system.
> 
> 
> 
> Thanks,
> 
> Dan

Try all those codes in a WP_PAINT message and create hdc with BeginPaint and Release HDC with EndPaint . this should work !