C# Signature:
[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 );
VB.NET Signature:
Declare Function StretchBlt Lib "gdi32.dll" (ByVal hdcDest As IntPtr, ByVal nXOriginDest As Integer, ByVal nYOriginDest As Integer, _
ByVal nWidthDest As Integer, ByVal nHeightDest As Integer, ByVal hdcSrc As IntPtr, ByVal nXOriginSrc As Integer, _
ByVal nYOriginSrc As Integer, ByVal nWidthSrc As Integer, ByVal nHeightSrc As Integer, ByVal dwRop As TernaryRasterOperations) As Boolean
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*/
};
}
}
Alternative Managed API:
Do you know one? Please contribute it!
