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Displaying a Bitmap Image: A Quick Demo

Learn how to create an SDI application in C++ using a bitmap image, with step-by-step instructions and sample code.

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Displaying a Bitmap Image: A Quick Demo

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  2. Displaying a BITMAP Image

  3. A Quick Demonstration • Create an SDI application. • In the Resource View, right-click to Add Resource, and create a new Bitmap image. • The default name should be IDB_BITMAP1. • Draw something in the bitmap.

  4. Sample Code • In the OnDraw() function inf the View class, add the following code: • CBitmap Bitmap; • Bitmap.LoadBitmapW(IDB_BITMAP1); • CDC memDC; • memDC.CreateCompatibleDC( pDC ); • memDC.SelectObject( &Bitmap ); • pDC->BitBlt( 0, 0, 48, 48, &memDC, 0, 0, SRCCOPY ); • If Intelli-sense warns you that it does not recognize IDB_BITMAP1 (yet), just ignore the warning. • Build and execute the program.

  5. The meaning of each line of code • A CBitmap object must be declared. • The CBitmap object must be initialized by calling its LoadBitmap() function. • A CDC object must be declared. • The CDC object must be initialized by calling its CreateCompatibleDC() member function. • This DC is referred to as a “memory device context”. • Select the CBitmap object into the CDC object, by calling the CDC’s SelectObject() function. • Copy the memberDC to an on-screen windows, by calling the screen CDC’s BitBlt() function. screen CDC memory DC Bitmap

  6. Can I Load an External Bitmap File? CString szFilename ("Y:\\Waste\\micky.bmp"); HBITMAP hBmp = (HBITMAP)::LoadImageW(NULL, szFilename, IMAGE_BITMAP,0, 0, LR_LOADFROMFILE|LR_CREATEDIBSECTION); CBitmap Bitmap; // Bitmap.LoadBitmapW(IDB_BITMAP2); Bitmap.Attach(hBmp); CDC memDC; memDC.CreateCompatibleDC( pDC ); CBitmap *pOldbmp = memDC.SelectObject( &Bitmap ); BITMAP bi;// Get the BMP Height and Width Bitmap.GetBitmap(&bi); pDC->BitBlt( 0, 0, bi.bmWidth, bi.bmHeight, &memDC, 0, 0, SRCCOPY ); memDC.SelectObject( pOldbmp );

  7. Add a Button to Trigger the Action • Create an SDI (single document interface) application. • Select CFormView as the base class. • In the Resource View, expand the Dialog resource and double-click the form. • Drag a button control to the form. • Double-click the button to add a handler. • Insert the code for displaying a BITMAP file.

  8. HW21 • Design an application with 3 buttons. Each button will display a different bitmap file when it is pushed. • Bonus: Design your button so that it will show/hide the corresponding bitmap as a toggle switch.

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