Control study-> image format conversion example: Convert *. jpg-> *. gif

(1). Functions

A sample program that demonstrates image format conversion.
Supported formats: conversion between bmp jpeg gif tiff png wmf and others

(2). Image example

(2). Code (the entire background code)

Using system;
Using system. drawing;
Using system. collections;
Using system. componentmodel;
Using system. Windows. forms;
Using system. Data;
Using system. IO;
Using system. Drawing. imaging;
Namespace image format conversion
{
/// <Summary>
/// Summary of form1.
/// </Summary>
Public class formmain: system. Windows. Forms. Form
{
Private system. Windows. Forms. Panel Panel1;
Private system. Windows. Forms. splitter splitter1;
Private system. Windows. Forms. Panel panel2;
Private system. Windows. Forms. Button buttonopen;
Private system. Windows. Forms. Button buttonconvert;
Private system. Windows. Forms. ComboBox;
Private system. Windows. Forms. Label label1;
Private system. Windows. Forms. Label label2;
/// <Summary>
/// Required designer variables.
/// </Summary>
Private system. componentmodel. Container components = NULL;
Private system. Windows. Forms. picturebox;
Private system. Drawing. Bitmap bitmap;

Public formmain ()
{
//
// Required for Windows Form Designer support
//
Initializecomponent ();

//
// Todo: add Any constructor code after initializecomponent calls
//
Bitmap = NULL;
Picturebox. width = panel2.width;
Picturebox. Height = panel2.height;
Picturebox. Top = panel1.top;
Picturebox. Left = panel1.left;
Panel2.resize + = new system. eventhandler (panel2_resize );
// Buttonopen. Click + = new system. eventhandler (buttonopen_click );
ComboBox. Items. addrange (new object [] {
"*. Jpg ",
"*. BMP ",
"*. GIF ",
"*. PNG ",
"*. Tif ",
"*. WMF"
});

}

/// <Summary>
/// Clear all resources in use.
/// </Summary>
Protected override void dispose (bool disposing)
{
If (disposing)
{
If (components! = NULL)
{
Components. Dispose ();
}
}
Base. Dispose (disposing );
}

# Region windows Form Designer generated code
/// <Summary>
/// The designer supports the required methods-do not use the code editor to modify
/// Content of this method.
/// </Summary>
Private void initializecomponent ()
{
This. Panel1 = new system. Windows. Forms. Panel ();
This. buttonconvert = new system. Windows. Forms. Button ();
This. buttonopen = new system. Windows. Forms. Button ();
This. ComboBox = new system. Windows. Forms. ComboBox ();
This. label1 = new system. Windows. Forms. Label ();
This. label2 = new system. Windows. Forms. Label ();
This. splitter1 = new system. Windows. Forms. Splitter ();
This. panel2 = new system. Windows. Forms. Panel ();
This. picturebox = new system. Windows. Forms. picturebox ();
This. panel1.suspendlayout ();
This. panel2.suspendlayout ();
This. suspendlayout ();
//
// Panel1
//
This. panel1.borderstyle = system. Windows. Forms. borderstyle. fixed3d;
This. panel1.controls. addrange (new system. Windows. Forms. Control [] {
This. buttonconvert,
This. buttonopen,
This. ComboBox,
This. label1,
This. label2 });
This. panel1.dock = system. Windows. Forms. dockstyle. Left;
This. panel1.name = "Panel1 ";
This. panel1.size = new system. Drawing. Size (128,365 );
This. panel1.tabindex = 0;
//
// Buttonconvert
//
This. buttonconvert. Location = new system. Drawing. Point (40,264 );
This. buttonconvert. Name = "buttonconvert ";
This. buttonconvert. size = new system. Drawing. Size (56, 24 );
This. buttonconvert. tabindex = 1;
This. buttonconvert. Text = "Conversion ";
Buttonconvert. Click + = new system. eventhandler (buttonconvert_click );
//
// Buttonopen
//
This. buttonopen. Location = new system. Drawing. Point (32, 56 );
This. buttonopen. Name = "buttonopen ";
This. buttonopen. size = new system. Drawing. Size (64, 24 );
This. buttonopen. tabindex = 0;
This. buttonopen. Text = "Open File ";
This. buttonopen. Click + = new system. eventhandler (this. buttonopen_click );
//
// ComboBox
//
This. ComboBox. Location = new system. Drawing. Point (64,224 );
This. ComboBox. Name = "ComboBox ";
This. ComboBox. size = new system. Drawing. Size (48, 20 );
This. ComboBox. tabindex = 0;
This. ComboBox. Text = "combobox1 ";
//
// Label1
//
This. label1.location = new system. Drawing. Point (24,104 );
This. label1.name = "label1 ";
This. label1.size = new system. Drawing. Size (80, 40 );
This. label1.tabindex = 0;
This. label1.text = "label1 ";
//
// Label2
//
This. label2.location = new system. Drawing. Point (8,224 );
This. label2.name = "label2 ";
This. label2.size = new system. Drawing. Size (48, 16 );
This. label2.tabindex = 0;
This. label2.text = "convert ";
//
// Splitter1
//
This. splitter1.location = new system. Drawing. Point (128, 0 );
This. splitter1.name = "splitter1 ";
This. splitter1.size = new system. Drawing. Size (3,365 );
This. splitter1.tabindex = 1;
This. splitter1.tabstop = false;
//
// Panel2
//
This. panel2.borderstyle = system. Windows. Forms. borderstyle. fixed3d;
This. panel2.controls. addrange (new system. Windows. Forms. Control [] {
This. picturebox });
This. panel2.dock = system. Windows. Forms. dockstyle. Fill;
This. panel2.location = new system. Drawing. Point (131, 0 );
This. panel2.name = "panel2 ";
This. panel2.size = new system. Drawing. Size (373,365 );
This. panel2.tabindex = 2;
//
// Picturebox
//
This. picturebox. Dock = system. Windows. Forms. dockstyle. Fill;
This. picturebox. Name = "picturebox ";
This. picturebox. size = new system. Drawing. Size (369,361 );
This. picturebox. sizemode = system. Windows. Forms. pictureboxsizemode. stretchimage;
This. picturebox. tabindex = 0;
This. picturebox. tabstop = false;
//
// Formmain
//
This. autoscalebasesize = new system. Drawing. Size (6, 14 );
This. clientsize = new system. Drawing. Size (504,365 );
This. Controls. addrange (new system. Windows. Forms. Control [] {
This. panel2,
This. splitter1,
This. Panel1 });
This. Name = "formmain ";
This. startposition = system. Windows. Forms. formstartposition. centerscreen;
This. Text = "formmain ";
This. panel1.resumelayout (false );
This. panel2.resumelayout (false );
This. resumelayout (false );

}
# Endregion

/// <Summary>
/// Main entry point of the application.
/// </Summary>
[Stathread]
Static void main ()
{
Application. Run (New formmain ());
}

Private void buttonopen_click (Object sender, system. eventargs E)
{
Openfiledialog = new openfiledialog ();
Openfiledialog. filter = "*. JPG ,*. JPEG ,*. BMP ,*. GIF ,*. ICO ,*. PNG ,*. TIF ,*. WMF | *. JPG ;*. JPEG ;*. BMP ;*. GIF ;*. ICO ;*. PNG ;*. TIF ;*. WMF ";
Openfiledialog. Title = "open image file ";
Openfiledialog. multiselect = false;
If (openfiledialog. showdialog () = dialogresult. OK)
{
If (Bitmap! = NULL)
{
Bitmap. Dispose ();
}
String filename = openfiledialog. filename;
Bitmap = new Bitmap (filename );
If (bitmap. width> bitmap. width)
{
Picturebox. width = panel2.width;
Picturebox. Height = (INT) (double) bitmap. Height * panel2.width/bitmap. width );
}
Else
{
Picturebox. Height = panel2.height;
Picturebox. width = (INT) (double) bitmap. Width * panel2.height/bitmap. Height );
}
Picturebox. Image = bitmap;
Fileinfo F = new fileinfo (filename );
This. Text = "image conversion:" + F. Name;
This. label1.text = f. Name;
Buttonconvert. Enabled = true;
}
}
Private void panel2_resize (Object sender, system. eventargs E)
{
Picturebox. Top = panel1.top;
Picturebox. Left = panel1.left;
If (Bitmap! = NULL)
{
If (bitmap. width> bitmap. Height)
{
Picturebox. width = panel2.width;
Picturebox. Height = (INT) (double) bitmap. Height * panel2.width/bitmap. width );
}
Else
{
Picturebox. Height = panel2.height;
Picturebox. width = (INT) (double) bitmap. Width * panel2.height/bitmap. Height );
}
}
Else
{
Picturebox. width = panel2.width;
Picturebox. Height = panel2.height;
}
Picturebox. Refresh ();
}
Private void buttonconvert_click (Object sender, system. eventargs E)
{
If (ComboBox. selecteditem = NULL)
{
Return;
}
Else
{
Savefiledialog = new savefiledialog ();
Savefiledialog. Title = "converted :";
Savefiledialog. overwriteprompt = true;
Savefiledialog. checkpathexists = true;
Savefiledialog. Filter = ComboBox. Text + "|" + ComboBox. text;
If (savefiledialog. showdialog () = dialogresult. OK)
{
String filename = savefiledialog. filename;
Switch (ComboBox. Text)
{
Case "*. BMP ":
Bitmap. Save (filename, imageformat. BMP );
Break;
Case "*. jpg ":
Bitmap. Save (filename, imageformat. JPEG );
Break;
Case "*. GIF ":
Bitmap. Save (filename, imageformat. GIF );
Break;
Case "*. tif ":
Bitmap. Save (filename, imageformat. Tiff );
Break;
Case "*. PNG ":
Bitmap. Save (filename, imageformat. PNG );
Break;
Case "*. WMF ":
Bitmap. Save (filename, imageformat. WMF );
Break;

}
Fileinfo F = new fileinfo (filename );
This. Text = "image conversion:" + F. Name;
Label1.text = f. Name;
}
}
}
}
}

(4) Sample Code download

Http://www.cnblogs.com/files/chengking/graphic format conversion .rar