C # detailed description of how to operate Clipboard to read data instances in the Clipboard

Source: Internet
Author: User

C # detailed description of how to operate Clipboard to read data instances in the Clipboard

This example describes how to read data from the Clipboard using C # Clipboard. Share it with you for your reference. The specific analysis is as follows:

1. Customize a class and ensure its serializability: implement the ISerializable interface; or mark it with [Serializable] (if there is a parent class, the parent class also needs to be marked; you can [NonSerialized ()] Mark Fields that do not want to be serialized in the class)

2. register the Custom Data Format: Call the static method DataFormats. GetFormat ()

3. Save data to clipboard: Use the IdataObject interface to create a data object and set the data. Call the Clipboard. SetDataObject () method.

4. obtain data from clipboard: Call GetDataPresent () of the DataObject instance to ensure the data format is compatible with the application. Call the GetData () method of IDataObject to obtain data.

Example program:

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Using System;

Using System. Collections. Generic;

Using System. ComponentModel;

Using System. Data;

Using System. Drawing;

Using System. Linq;

Using System. Text;

Using System. Windows. Forms;

Using System. Runtime. Serialization. Formatters. Binary;

Namespace _ ClipboardTest _

{

Public partial class Form1: Form

{

[System. Runtime. InteropServices. DllImport ("user32")]

Private static extern IntPtr SetClipboardViewer (IntPtr hwnd );

[System. Runtime. InteropServices. DllImport ("user32")]

Private static extern IntPtr changeconboardchain (IntPtr hwnd, IntPtr hWndNext );

[System. Runtime. InteropServices. DllImport ("user32")]

Private static extern int SendMessage (IntPtr hwnd, int wMsg, IntPtr wParam, IntPtr lParam );

Const int WM_DRAWCLIPBOARD = 0x308;

Const int WM_CHANGECBCHAIN = 0x30D;

Public Form1 ()

{

InitializeComponent ();

}

Private void Form1_Load (object sender, EventArgs e)

{

// Obtain the next window handle in the observation chain

NextClipHwnd = SetClipboardViewer (this. Handle );

}

Protected override void WndProc (ref System. Windows. Forms. Message m)

{

Switch (m. Msg)

{

Case WM_DRAWCLIPBOARD:

// Pass the WM_DRAWCLIPBOARD message to the window in the next observation chain

SendMessage (NextClipHwnd, m. Msg, m. WParam, m. LParam );

IDataObject iData = Clipboard. GetDataObject ();

// Detect text

If (iData. GetDataPresent (DataFormats. Text) | iData. GetDataPresent (DataFormats. OemText ))

{

This. richTextBox1.Text = (String) iData. GetData (DataFormats. Text );

}

// Detect Images

If (iData. GetDataPresent (DataFormats. Bitmap ))

{

PictureBox1.Image = Clipboard. GetImage ();

MyItem item = new MyItem ();

Item. CopyToClipboard ();

}

// Detect custom types

If (iData. GetDataPresent (typeof (MyItem). FullName ))

{

// MyItem item = (MyItem) iData. GetData (typeof (MyItem). FullName );

MyItem item = GetFromClipboard ();

If (item! = Null)

{

This. richTextBox1.Text = item. ItemName;

}

}

Break;

Default:

Base. WndProc (ref m );

Break;

}

}

Private void formpolicclosed (object sender, System. EventArgs e)

{

// Delete the observation window from the observation chain (first parameter: handle of the window to be deleted;

// Second parameter: Observe the handle of the next window in the chain)

Changeconboardchain (this. Handle, NextClipHwnd );

// Send the changed message WM_CHANGECBCHAIN to the window in the next observation chain

SendMessage (NextClipHwnd, WM_CHANGECBCHAIN, this. Handle, NextClipHwnd );

}

IntPtr NextClipHwnd;

Protected static MyItem GetFromClipboard ()

{

MyItem item = null;

IDataObject dataObj = Clipboard. GetDataObject ();

String format = typeof (MyItem). FullName;

If (dataObj. GetDataPresent (format ))

{

Item = dataObj. GetData (format) as MyItem;

}

Return item;

}

}

[Serializable]

Public class MyItem

{

Public MyItem ()

{

ItemName = "This is a Custom Item ";

}

Public string ItemName

{

Get {return itemName ;}

}

Private string itemName;

 

Public void CopyToClipboard ()

{

DataFormats. Format format = DataFormats. GetFormat (typeof (MyItem). FullName );

IDataObject dataObj = new DataObject ();

DataObj. SetData (format. Name, false, this );

Clipboard. SetDataObject (dataObj, false );

}

}

}

I hope this article will help you with C # programming.

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