Re: [Dev-C++] drawing in Windows

[Daniel G. <sp...@ho...>]

Yes you need to serialise the information to a file. I'll see if I can dig 
up some information on this, but that's what you need to do.






>From: "Vlada Djurovic" <dj...@im...>
>To: "'DevC++ help'" <dev...@li...>
>Subject: [Dev-C++] drawing in Windows
>Date: Thu, 24 Oct 2002 10:32:16 +0200
>
>Hi, everybody
>Here's my problem: I'm trying to write a simple drawing app (just for 
>exercise) and so far its been going OK. I can draw lines in client area in 
>different colors, but when ever I minimize or maximize the window, or 
>something similar happenes, all the content of the window is gone. I tried 
>to use a memory DC an bitmap to save the contents in, and BitBlt it back in 
>response to WM_PAINT message, but the program just "froze". Can anybody 
>give me a hint how to do it? Here's the code used for drawing lines without 
>any restoring parts:
>
>         case WM_MOUSEMOVE:
>         {
>             switch(iTool)           /* iTool is used for dtetrmining which 
>drawing tool is selected(line, rect etc.)*/
>             {
>                 case 0:
>                 {
>                    if(wParam==MK_LBUTTON)    /*if line is selected 
>(itool=0) and left button presed*/
>                    {
>                          HDC hDC=GetDC(hwnd);
>
>                        HPEN hPen=CreatePen(PS_SOLID,iCurWidth,crCurColor);
>                        HPEN hOldPen=(HPEN)SelectObject(hDC,hPen);
>                        CLine* pLine=new 
>CLine(ptPrevPos,MAKEPOINTS(lParam),iCurWidth,crCurColor); /*create new line 
>object*/
>                        pLine->DrawLine(hDC);
>                        ptPrevPos=MAKEPOINTS(lParam);
>                        SelectObject(hDC,hOldPen);
>                        DeleteDC(hDC);
>                    }
>                 }
>                 break;
>                 case 1: /* nothing here yet*/
>                 break;
>             }
>         }


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