[DllImport("gdi32.dll")]
static extern bool StretchBlt(IntPtr hdcDest, int nXOriginDest, int nYOriginDest,
    int nWidthDest, int nHeightDest,
    IntPtr hdcSrc, int nXOriginSrc, int nYOriginSrc, int nWidthSrc, int nHeightSrc,    
    TernaryRasterOperations dwRop );

User-Defined Types:

None.

Notes:

None.

Tips & Tricks:

Please add some!

Sample Code:

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Runtime.InteropServices;

namespace StretchBlt_with_bitmap_image
{
    /// <summary>
    /// Summary description for Form1.
    /// </summary>
    public class Form1 : System.Windows.Forms.Form
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.Container components = null;

        Bitmap bmp;
        private System.Windows.Forms.MainMenu mainMenu1;
        private System.Windows.Forms.MenuItem menuItem1;
        private System.Windows.Forms.MenuItem menuItem2;

        IntPtr hbmp;

        public Form1()
        {
            InitializeComponent();            
        }

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        protected override void Dispose( bool disposing )
        {
            if( disposing )
            {
                if (components != null)
                {
                    components.Dispose();
                }
            }
            base.Dispose( disposing );
        }

        #region Windows Form Designer generated code
        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.mainMenu1 = new System.Windows.Forms.MainMenu();
            this.menuItem1 = new System.Windows.Forms.MenuItem();
            this.menuItem2 = new System.Windows.Forms.MenuItem();
            //
            // mainMenu1
            //
            this.mainMenu1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
                                                                                      this.menuItem1});
            //
            // menuItem1
            //
            this.menuItem1.Index = 0;
            this.menuItem1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
                                                                                      this.menuItem2});
            this.menuItem1.Text = "Fie";
            //
            // menuItem2
            //
            this.menuItem2.Index = 0;
            this.menuItem2.Text = "open";
            this.menuItem2.Click += new System.EventHandler(this.menuItem2_Click);
            //
            // Form1
            //
            this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
            this.ClientSize = new System.Drawing.Size(292, 273);
            this.Menu = this.mainMenu1;
            this.Name = "Form1";
            this.Text = "Form1";
            this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint);

        }
        #endregion

        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.Run(new Form1());
        }

        private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
        {
            if(bmp != null)
            {
                this.AutoScrollMinSize = bmp.Size;
                hbmp = bmp.GetHbitmap();

                IntPtr pTarget = e.Graphics.GetHdc();
                IntPtr pSource = CreateCompatibleDC(pTarget);
                IntPtr pOrig = SelectObject(pSource, hbmp);

                StretchBlt(pTarget, this.AutoScrollPosition.X,
                    this.AutoScrollPosition.Y,  bmp.Width , bmp.Height ,pSource,  
                    0,0,bmp.Width,  bmp.Height,TernaryRasterOperations.SRCCOPY);

                IntPtr pNew = SelectObject(pSource, pOrig);
                DeleteObject(pNew);
                DeleteDC(pSource);
                e.Graphics.ReleaseHdc(pTarget);
            }
        }

        private void Form1_Resize(object sender, System.EventArgs e)
        {
            this.Invalidate();
        }

        string _fileName = "";

        //File open click
        private void menuItem2_Click(object sender, System.EventArgs e)
        {
            OpenFileDialog dlg = new OpenFileDialog();

            if(dlg.ShowDialog() == DialogResult.OK)
            {
                _fileName = dlg.FileName;
            }
            bmp = new Bitmap(_fileName);
            this.AutoScrollMinSize = bmp.Size;
            this.Invalidate();
        }

        [DllImport("gdi32.dll")]
        static extern bool StretchBlt(IntPtr hdcDest, int nXOriginDest,
            int nYOriginDest, int nWidthDest, int nHeightDest, IntPtr hdcSrc,
            int nXOriginSrc, int nYOriginSrc, int nWidthSrc, int nHeightSrc,    
            TernaryRasterOperations dwRop );

        [DllImport("gdi32.dll", ExactSpelling=true, SetLastError=true)]
        static extern IntPtr CreateCompatibleDC(IntPtr hdc);

        [DllImport("gdi32.dll", ExactSpelling=true, SetLastError=true)]
        static extern bool DeleteDC(IntPtr hdc);

        [DllImport("gdi32.dll", ExactSpelling=true, SetLastError=true)]
        static extern IntPtr SelectObject(IntPtr hdc, IntPtr hgdiobj);

        [DllImport("gdi32.dll", ExactSpelling=true, SetLastError=true)]
        static extern bool DeleteObject(IntPtr hObject);

        [DllImport("gdi32.dll")]
        static extern bool SetStretchBltMode(IntPtr hdc, StretchMode iStretchMode);

        public enum StretchMode
        {
            STRETCH_ANDSCANS    =1,
            STRETCH_ORSCANS     =2,
            STRETCH_DELETESCANS =3,
            STRETCH_HALFTONE    =4,
        }

        public enum TernaryRasterOperations
        {
            SRCCOPY     = 0x00CC0020, /* dest = source*/
            SRCPAINT    = 0x00EE0086, /* dest = source OR dest*/
            SRCAND      = 0x008800C6, /* dest = source AND dest*/
            SRCINVERT   = 0x00660046, /* dest = source XOR dest*/
            SRCERASE    = 0x00440328, /* dest = source AND (NOT dest )*/
            NOTSRCCOPY  = 0x00330008, /* dest = (NOT source)*/
            NOTSRCERASE = 0x001100A6, /* dest = (NOT src) AND (NOT dest) */
            MERGECOPY   = 0x00C000CA, /* dest = (source AND pattern)*/
            MERGEPAINT  = 0x00BB0226, /* dest = (NOT source) OR dest*/
            PATCOPY     = 0x00F00021, /* dest = pattern*/
            PATPAINT    = 0x00FB0A09, /* dest = DPSnoo*/
            PATINVERT   = 0x005A0049, /* dest = pattern XOR dest*/
            DSTINVERT   = 0x00550009, /* dest = (NOT dest)*/
            BLACKNESS   = 0x00000042, /* dest = BLACK*/
            WHITENESS   = 0x00FF0062, /* dest = WHITE*/
        };
    }
}

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