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POwin32: TextOut not being displayed
 

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  1. POwin32: TextOut not being displayed
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    <p>I recently having my mainwindow write text by using WM_PAINT, but now I realise it was maybe not the best message to do so in, so I'm trying another version;</p> <p>The mainwindow contains a menu, upon clicing a menu item the ID_FILE_PID msg is sent and it builds the 4 new windows aswell as displays text in the mainwindow (paintEditSigns function). The 4 windows works fine but the text dosn't work at all, unless I do it in the main() function as shown... what on earth is this? O_O</p> <p>BTW: I still have no clue why the code-display on StackOverflow keeps looking so wierd when I post, why is this?</p> <pre><code>switch(message) { case WM_COMMAND: switch (LOWORD(wParam)) { case ID_FILE_PID: { HWND hWndButton; HWND hWndEdit; HWND hWndEdit2; HWND hWndDisplay; // drawing the text in mainwindow trigger=true; // adding new windows in the mainwindow hWndButton = CreateWindowEx(0,TEXT("BUTTON"),"Modify",WS_CHILD | WS_VISIBLE | BS_DEFPUSHBUTTON, 170,56,80,30,hWnd,(HMENU)ID_BUTTON,hThisInstance,NULL); hWndEdit = CreateWindowEx(0,RICHEDIT_CLASS,TEXT(""),WS_CHILD | WS_VISIBLE | WS_BORDER, 120,30,80,25,hWnd,(HMENU)ID_EDIT,hThisInstance,NULL); hWndEdit2 = CreateWindowEx(0,RICHEDIT_CLASS,TEXT(""),WS_CHILD | WS_VISIBLE | WS_BORDER, 220,30,80,25,hWnd,(HMENU)ID_EDIT2,hThisInstance,NULL); hWndDisplay = CreateWindowEx(0,TEXT("STATIC"),NULL,WS_CHILD | WS_VISIBLE | WS_BORDER, 0,100,450,140,hWnd,(HMENU)ID_DISPLAY,hThisInstance,NULL); UpdateWindow(hWnd); break; } ..... case WM_PAINT: { if (trigger) { paintEditSigns() } break; } // // Main function // int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) { HWND hWnd; WNDCLASSEX wc; ZeroMemory(&amp;wc, sizeof(WNDCLASSEX)); hThisInstance = hInstance; LoadLibrary("Riched20.dll"); wc.cbSize = sizeof(WNDCLASSEX); wc.style = CS_HREDRAW | CS_VREDRAW; wc.lpfnWndProc = WindowProc; wc.hInstance = hInstance; wc.lpszMenuName = MAKEINTRESOURCE(IDR_MYMENU); if(!(wc.hIcon = LoadIcon(hInstance,MAKEINTRESOURCE(IDI_MYICON)))) { HRESULT res = GetLastError(); } wc.hCursor = LoadCursor(NULL, IDC_ARROW); wc.hbrBackground = (HBRUSH)COLOR_WINDOW; wc.lpszClassName = TEXT("testcpp"); RegisterClassEx(&amp;wc); hWnd = CreateWindowEx(NULL, wc.lpszClassName, TEXT("test"), WS_OVERLAPPEDWINDOW, 300, 200, 450, 300, NULL, NULL, hInstance, NULL); ShowWindow(hWnd,nCmdShow); //paintEditSigns() -- here it works, but not when in the message part MSG msg; while (GetMessage(&amp;msg, NULL,0,0)) { TranslateMessage(&amp;msg); DispatchMessage(&amp;msg); } return msg.wParam; } void paintEditSigns() { HFONT hf = createFont(); PAINTSTRUCT ps; HWND hWnd = FindWindow(TEXT("testcpp"),TEXT("test")); HBRUSH hbruzh = CreateSolidBrush(RGB(0,0,0)); HDC hdz = BeginPaint(hWnd,&amp;ps); string s = "Memory Address"; SelectBrush(hdz,hbruzh); SelectFont(hdz,hf); TextOut(hdz,0,100,s.c_str(),s.length()); EndPaint(hWnd,&amp;ps); DeleteObject(hbruzh); } HFONT createFont() { HDC hdc; long lfHeight; hdc = GetDC(NULL); lfHeight = -MulDiv(12, GetDeviceCaps(hdc, LOGPIXELSY), 72); ReleaseDC(NULL, hdc); HFONT hf = CreateFont(lfHeight, 0, 0, 0, 0, TRUE, 0, 0, 0, 0, 0, 0, 0, "MS Sans Serif"); return hf; } </code></pre>
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    1. USKaiserJohaan
    1. USKaiserJohaan
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    1. COto fix the formatting you should select your code and click the `{}` button in the editor toolbar, this will indent all the code by 4 spaces which stackoverflow then formats as code.
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      1. POwin32: TextOut not being displayed
      1. USChris Taylor
    2. COcouple comments about your code: 1) you should not `DeleteObject` a GDI object that is selected in a device context. Common practice is to save the old object handle, then select it back in before you `DeleteObject`. 2) `LoadLibrary` returns a ref-counted handle. You should free that handle when appropriate. 3) you won't need to use `UpdateWindow`. GDI and winapi painting take a lot of getting used-to, so I think everyone goes through questions like this at some point. Be meticulous in reading MSDN docs for the API, and don't skim over confusing parts; try to understand them.
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      1. POwin32: TextOut not being displayed
      1. UStenfour
 

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