   Window Client Area Redraw Issue
  Hi. I am very out of pactice in my C++ and have even forgotten how to make a window correctly!I am having an issue where the window displays but the client area never updates. it is a snapshot of whatever was under the window when it was displayed.How do I make the window client area display as the standard grey as I am expecting?I have pieced this together from examples on MSDN. (Some of which appear to not give all the info you need)Here is my code :#include <windows.h>LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam){switch (uMsg){case WM_DESTROY:    PostQuitMessage( 0 );    break;default :  return DefWindowProc(hwnd, uMsg, wParam, lParam);}}int WINAPI winmain(HINSTANCE hInst, HINSTANCE hPrevInstance, LPSTR lpCmdLine, INT nCmdShow){    // Register the window class.    WNDCLASSEX wc = { sizeof(WNDCLASSEX), CS_CLASSDC, WindowProc, 0L, 0L, GetModuleHandle(NULL), NULL, NULL, NULL, NULL,"test", NULL };RegisterClassEx( &wc );// Create the application's window.HWND hWnd = CreateWindowEx(0, "test", "test2", WS_OVERLAPPEDWINDOW | WS_HSCROLL | WS_VSCROLL, 100, 100, 300, 300,(HWND) NULL, (HMENU) NULL, wc.hInstance, NULL ); if (!hWnd)  return FALSE; ShowWindow(hWnd, SW_SHOWDEFAULT);UpdateWindow(hWnd); MSG msg;BOOL fGotMessage;    while ((fGotMessage = GetMessage(&msg, (HWND) NULL, 0, 0)) != 0 && fGotMessage != -1){    TranslateMessage(&msg);    DispatchMessage(&msg);} return TRUE;};Any help appreciated.[Edited by - peter_mayes on May 30, 2009 2:34:40 AM]
  I'm not a WinAPI expert, but is it perhaps because you're not handling WM_PAINT messages?   ;  You need to either handle WM_PAINT as jyk mentioned or you need to initialize the hbrBackground member of your WNDCLASSEX instead of just slamming in NULL for everything.Minor: you question has 100% absolutely nothing to do with C++.   ;  Thankyou.Yes I needed the hbrBackground member filled in.I think where I went wrong is I was looking at a DirectX example that doesn't bother filling it in as it renders straight to the cliant area in that sample (eventually).Also :"Minor: you question has 100% absolutely nothing to do with C++."Except for the fact that my code sample is written in C++ and the syntax MAY have been wrong somewhere. :D (which wasn't the case here but it could have been) ;  If you get stuck with the basics of creating a window AND you are using Visual C++ Express, start a new windowed project and you'll see all the code you need to create a sample window.   