Print a Real Image Size in Inches

This tutorial describes how to print a real image size in inches using the LEADTOOLS C\C++ API.

  1. Define the following global variables: 

    LBitmapBase BitmapBase; // bitmap   
L_FLOAT fRealWidth; // Image's real width in inches   
L_FLOAT fRealHeight; // Image's real height in inches   
L_FLOAT fPrnDPIX; // Number of pixels per logical inch along the screen width   
L_FLOAT fPrnDPIY; // Number of pixels per logical inch along the screen height

  2. Load the image in a LEAD bitmap: 

    BitmapBase.Load(TEXT("C:\\IMAGE1.CMP"), 0, ORDER_BGR, NULL, NULL);

  3. Calculate the real width and height of the bitmap in inches: 

    fRealWidth = (L_FLOAT)BitmapBase.GetWidth() / (L_FLOAT)BitmapBase.GetXResolution();   
fRealHeight = (L_FLOAT)BitmapBase.GetHeight() / (L_FLOAT)BitmapBase.GetYResolution();

  4. Get the printer's device context: 

    HDC hdcPrinter = NULL; // Printer device context   
LPrint LeadPrint(&BitmapBase); // LEAD Print   
hdcPrinter = LeadPrint.GetPrinterDC();

  5. Get the width and height DPI: 

    fPrnDPIX = (L_FLOAT)GetDeviceCaps(hdcPrinter, LOGPIXELSX);   
fPrnDPIY = (L_FLOAT)GetDeviceCaps(hdcPrinter, LOGPIXELSY);

  6. Now you are ready to print the image with real size in inches: 

    if(LeadPrint.IsValid() && hdcPrinter)   
   LeadPrint.Print(hdcPrinter, 1, 1, (L_INT)(fRealWidth * fPrnDPIX), (L_INT)(fRealHeight * fPrnDPIX));

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