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stringa

GDI+ Double Buffering...Flicker about every 15 seconds

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Hello........I am doing a conversion from GDI to GDI+ and I'm having trouble double buffering this app. Basically, I write everything to a Buffer and once that's finished, I DrawImage() to the Window DC. Here's my simple render function. The problem is...It flickers about once every 15 seconds or so. Anyone know how to fix this? // The last DC which is the screen Gdiplus::Graphics g(GetDC(win)); // Fill in the buffer with the board BufferDC->DrawImage(EmptyBoardBitmap,0,0); Gdiplus::Color transparent_black(100,0,0,0); Gdiplus::SolidBrush transparent_brush(transparent_black); BufferDC->FillRectangle( &transparent_brush, BOARD_START_X, BOARD_START_Y, BOARD_SIZE_X * BLOCK_PIXELS_X, BOARD_SIZE_Y * BLOCK_PIXELS_Y); BufferDC->DrawImage(BoardMinusAvatarBitmap, BOARD_START_X, BOARD_START_Y, BOARD_START_X, BOARD_START_Y, BOARD_SIZE_X * BLOCK_PIXELS_X, BOARD_SIZE_Y * BLOCK_PIXELS_Y, Gdiplus::UnitPixel); // Draw the avatar insert_avatar_onto_buffer(BufferDC, theGame); g.DrawImage( BufferBitmap,0,0);

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I've never used gdiplus, but I'd guess the problem is that the window is being refreshed which causes it to fill it's area with it's background color.

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Thanks for fixing the problem. I was letting DefWindowProc handle that message. inserted the following in WinProc and now it's working

case WM_ERASEBKND: // something like that

break;


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