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POHow do you create a button outside the WM_CREATE message in win32?
 

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  1. POHow do you create a button outside the WM_CREATE message in win32?
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    <p>I'm using c++ with win32 and gdi+ for graphics.<br> When I initialize a button outside WM_CREATE, specifically in a WM_TIMER message, I can't draw anything else, after that one frame is drawn. Here's a snippet of the code:</p> <pre><code>case WM_TIMER: RECT client; GetClientRect(hWnd, &amp;client); client.bottom-=100; //The bottom hundred pixels are static after I draw the first frame, so I never update them if(starting==true) { starting=false; hdc = GetDC(hWnd); hdcBuf = CreateCompatibleDC(hdc); hdcMem = CreateCompatibleDC(hdcBuf); hbmBackBM = CreateCompatibleBitmap(hdc, client.right, client.bottom ); hbmOldBackBM = (HBITMAP)SelectObject(hdcBuf, hbmBackBM); Graphics temp(hdc); SolidBrush yelloworange(Color(250,225,65)); temp.FillRectangle(&amp;yelloworange,0,client.bottom,client.right,100); //Fill the bottom with yellow buttons[0]=CreateWindow("button","makereg", WS_VISIBLE | WS_CHILD | BS_DEFPUSHBUTTON, 100, 630, 60, 20, hWnd, HMENU(IDB_MAKEREG), NULL, NULL); //buttons[1]=CreateWindow("button","destroyreg", WS_VISIBLE | WS_CHILD | BS_DEFPUSHBUTTON, 100, 670, 80, 20, hWnd, HMENU(IDB_MAKEREG+1), NULL, NULL); } Graphics g(hdcBuf); </code></pre> <p>The first part is for double buffering, and the variables that I instantiate are global. I delete the HDCs and HBITMAPs in WM_DESTROY. starting is a global boolean that is instantiated as true. I do all of my drawing in this WM_TIMER message. If I comment out just the two lines where the buttons are created, everything runs normally. With them, it only draws out what is left in this WM_TIMER, and does not draw in the next one. All of the other drawing code is done to hdcBuf or g, and hdcBuf is then BitBlt'd onto hdc.</p> <p>I tried creating the button in WM_CREATE, and then showing it in WM_TIMER, but that caused the same problem. I can't create and show the window in WM_CREATE, because otherwise it gets drawn over when I fill the bottom 100 pixels with a yellow color.</p> <p>Is there a way to create and show a button outside WM_CREATE and outside WM_PAINT without crashing the rest of the code?</p> <p>EDIT: Here is some of the code that stops working, in WM_TIMER:</p> <pre><code>if(mousex!=uptomousex &amp;&amp; mousey!=uptomousey &amp;&amp; lbuttondown==true) // this code draws a rectangle between the point where the user begins holding the left mousebutton, and where the mouse is right now. { if(uptomousex-mousex&gt;0 &amp;&amp; uptomousey-mousey&gt;0) g.DrawRectangle(&amp;(p[0]), mousex, mousey, uptomousex-mousex, uptomousey-mousey); else if(uptomousex-mousex&lt;0 &amp;&amp; uptomousey-mousey&gt;0) g.DrawRectangle((&amp;p[0]), uptomousex, mousey, mousex-uptomousex, uptomousey-mousey); else if(uptomousex-mousex&gt;0 &amp;&amp; uptomousey-mousey&lt;0) g.DrawRectangle((&amp;p[0]), mousex, uptomousey, uptomousex-mousex, mousey-uptomousey); else if(uptomousex-mousex&lt;0 &amp;&amp; uptomousey-mousey&lt;0) g.DrawRectangle(&amp;(p[0]), uptomousex, uptomousey, mousex-uptomousex, mousey-uptomousey); } </code></pre> <p>Some global variables:</p> <pre><code>bool lbuttondown=false; float mousex=0; float mousey=0; float uptomousex=0; float uptomousey=0; </code></pre> <p>Elsewhere in WndProc...</p> <pre><code>case WM_LBUTTONDOWN: lbuttondown=true; mousex=(float)GET_X_LPARAM(lParam); mousey=(float)GET_Y_LPARAM(lParam); uptomousex=mousex; uptomousey=mousey; break; case WM_MOUSEMOVE: if(mousex!=GET_X_LPARAM(lParam) &amp;&amp; mousey!=GET_Y_LPARAM(lParam)) { uptomousex=(float)GET_X_LPARAM(lParam); uptomousey=(float)GET_Y_LPARAM(lParam); } break; </code></pre>
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    1. PO
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    1. USdrowdemon
    1. USdrowdemon
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      1. POHow do you create a button outside the WM_CREATE message in win32?
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      1. VTUpMod
    1. COYou can create controls whenever you like and creating one would not normally prevent "drawing" from working. I think you will need to post some more code, particularly the code that actually "stops working" before anyone would be able to help you.
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      1. POHow do you create a button outside the WM_CREATE message in win32?
      1. USJonathan Potter
 

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