// c#中win32 api的调用
//windows 消息机制的原理
//clipboard viewer chain.
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
namespace UseClipboard
{
public partial class frmMain : Form
{
private int nextWindow;
[DllImport("User32.dll")]
public static extern int SetClipboardViewer(int h);
[DllImport("User32.dll")]
public static extern int SendMessage(int hwnd, int wMsg, int wParam, int lParam);
protected override void WndProc(ref Message m)
{
switch (m.Msg)
{
case 0x308://WM_DRAWCLIPBOARD
//string message = string.Format("收到消息!参数为:{0},{1}", m.WParam, m.LParam);
//MessageBox.Show(message);
if (nextWindow != 0)
{
SendMessage(nextWindow, Int32.Parse(m.Msg.ToString()), m.WParam.ToInt32(), m.LParam.ToInt32());
}
PasteFromClipboard();
break;
case 0x30d://WM_CHANGECBCHAIN
string message2 = string.Format("收到消息!参数为:{0},{1}", m.WParam, m.LParam);
MessageBox.Show(message2);
if (nextWindow == m.WParam.ToInt32())
nextWindow = m.LParam.ToInt32();
else if (nextWindow != 0)
{
SendMessage(nextWindow, Int32.Parse(m.Msg.ToString()), m.WParam.ToInt32(), m.LParam.ToInt32());
}
break;
default:
base.DefWndProc(ref m);
break;
}
}
public frmMain()
{
InitializeComponent();
nextWindow = SetClipboardViewer(Handle.ToInt32());
}
//图片
private Image bmp
{
get
{
return pictureBox1.Image;
}
set
{
pictureBox1.Image = value;
}
}
//图片说明
private string info
{
get
{
return txtImageInfo.Text;
}
set
{
txtImageInfo.Text = value;
}
}
private void btnLoadPic_Click(object sender, EventArgs e)
{
ChooseImageFile();
}
//选择图片
private void ChooseImageFile()
{
if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
bmp = new Bitmap(openFileDialog1.FileName);
}
}
//根据用户设定的信息创建对象
private MyPic CreateMyPicObj()
{
MyPic obj = new MyPic();
obj.pic = bmp;
obj.picInfo = info;
return obj;
}
//将对象复制到剪贴板上
private void CopyToClipboard()
{
//创建MyPic对象
MyPic obj = CreateMyPicObj();
//向剪贴板注册类型，格式为“项目名称.数据格式名”
DataFormats.Format UserDefFormat = DataFormats.GetFormat("UseClipboard.MyPic");
//创建一个数据对象，将MyPic类型的对象装入
IDataObject dataobj = new DataObject(obj);
//其它类型的数据也可以装入到数据对象中
dataobj.SetData(DataFormats.UnicodeText, info);
dataobj.SetData(DataFormats.Bitmap, bmp);
//复制到剪贴板上，第二个参数表明程序退出时不清空剪贴板
Clipboard.SetDataObject(dataobj,true );
}
private void btnExit_Click(object sender, EventArgs e)
{
Close();
}
private void btnCopyToClipboard_Click(object sender, EventArgs e)
{
CopyToClipboard();
}
//从剪贴板获取数据
private void PasteFromClipboard()
{
//剪贴板上有我需要的数据吗？
if (Clipboard.ContainsData("UseClipboard.MyPic") == false)
return;
//读取数据
IDataObject clipobj = Clipboard.GetDataObject();
//将数据转换为需要的类型
MyPic mypicobj = clipobj.GetData("UseClipboard.MyPic") as MyPic;
//从数据对象中分解出需要的数据
info = mypicobj.picInfo;
pictureBox1.Image = mypicobj.pic;
}
private void btnPasteFromClipboard_Click(object sender, EventArgs e)
{
PasteFromClipboard();
}
}
}
