因為近來想寫個類似於遠程桌面監控的程序,該程序中要用到屏幕捕捉.為實現該程序的一部分功能,做了個小DEMO.程序很簡單，用到的技術也不多，只能實現類似qq的截圖功能(方法雖然很笨)
程序流程如下：
1.截取整個屏幕並保存
2.新開一個全屏窗口,將保存的屏幕作為背景
3.鼠標拖動改變截取范圍,右鍵取消
4.雙擊截取,保存在粘貼板,全屏窗口關閉
好了,下面的是代碼部分
首先新建一個項目ScreenCutter(VS2005),將窗體名改為MainForm,再新建一個窗體ScreenBody.
添加一個按鈕btnCutter到ScreenCutter並添加按鈕事件:
private void btnCutter_Click(object sender, EventArgs e)
{
Image img = new Bitmap(Screen.AllScreens[0].Bounds.Width, Screen.AllScreens[0].Bounds.Height);
Graphics g = Graphics.FromImage(img);
g.CopyFromScreen(new Point(0, 0), new Point(0, 0), Screen.AllScreens[0].Bounds.Size);
ScreenBody body = new ScreenBody();
body.BackgroundImage = img;
body.Show();
}
Screen.AllScreens[0]是獲取當前所有設備窗口的第一個,我這裡只有一個顯示器,當然我就是第一個.
利用Graphics的CopyFromScreen函數獲取當前屏幕.
好了,現在按下按鈕全屏窗口就會出來了.
下面講全屏窗口ScreenBody,首先設置窗體的FormBorderStyle為None,然後聲明以下變量
private Graphics MainPainter; //主畫筆
private Pen pen; //就是筆咯
private bool isDowned; //判斷鼠標是否按下
private bool RectReady; //矩形是否繪制完成
private Image baseImage; //基本圖形(原來的畫面)
private Rectangle Rect; //就是要保存的矩形
private Point downPoint; //鼠標按下的點
int tmpx;
int tmpy;
之後就是窗體的鼠標函數了,裡面很多代碼都沒有作出整理,看了一下,整理後的代碼應該會更少更精簡的
private void ScreenBody_DoubleClick(object sender, EventArgs e)
{
if (((MouseEventArgs)e).Button == MouseButtons.Left &&Rect.Contains(((MouseEventArgs)e).X, ((MouseEventArgs)e).Y))
{
//保存的時候有很多種方法的......我這裡只用了這種
Image memory = new Bitmap(Rect.Width, Rect.Height);
Graphics g = Graphics.FromImage(memory);
g.CopyFromScreen(Rect.X + 1, Rect.Y + 1, 0, 0, Rect.Size);
Clipboard.SetImage(memory);
this.Close();
}
}
private void ScreenBody_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
isDowned = true;
if (RectReady == false)
{
Rect.X = e.X;
Rect.Y = e.Y;
downPoint = new Point(e.X, e.Y);
}
if (RectReady == true)
{
tmpx = e.X;
tmpy = e.Y;
}
}
if (e.Button == MouseButtons.Right)
{
if (RectReady != true)
{
this.Close();
return;
}
MainPainter.DrawImage(baseImage, 0, 0);
RectReady = false;
}
}
private void ScreenBody_MouseUp(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
isDowned = false;
RectReady = true;
}
}
private void ScreenBody_MouseMove(object sender, MouseEventArgs e)
{
if (RectReady == false)
{
if (isDowned == true)
{
Image New = DrawScreen((Image)baseImage.Clone(), e.X, e.Y);
MainPainter.DrawImage(New, 0, 0);
New.Dispose();
}
}
if (RectReady == true)
{
if (Rect.Contains(e.X, e.Y))
{
//this.Cursor = Cursors.Hand;
if (isDowned == true)
{
//和上一次的位置比較獲取偏移量
Rect.X = Rect.X + e.X - tmpx;
Rect.Y = Rect.Y + e.Y - tmpy;
//記錄現在的位置
tmpx = e.X;
tmpy = e.Y;
MoveRect((Image)baseImage.Clone(), Rect);
}
}
}
}
private void ScreenBody_Load(object sender, EventArgs e)
{
this.WindowState = FormWindowState.Maximized;
MainPainter = this.CreateGraphics();
pen = new Pen(Brushes.Blue);
isDowned = false;
baseImage = this.BackgroundImage;
Rect = new Rectangle();
RectReady = false;
}
輔助函數
本來應該寫更多的輔助函數的,將窗體響應函數裡面的代碼放到裡面來,不過本人很懶,就這樣將就了.呵呵
private void DrawRect(Graphics Painter, int Mouse_x, int Mouse_y)
{
int width = 0;
int heigth = 0;
if (Mouse_y < Rect.Y)
{
Rect.Y = Mouse_y;
heigth = downPoint.Y - Mouse_y;
}
else
{
heigth = Mouse_y - downPoint.Y;
}
if (Mouse_x < Rect.X)
{
Rect.X = Mouse_x;
width = downPoint.X - Mouse_x;
}
else
{
width = Mouse_x - downPoint.X;
}
Rect.Size = new Size(width, heigth);
Painter.DrawRectangle(pen, Rect);
}
private Image DrawScreen(Image back, int Mouse_x, int Mouse_y)
{
Graphics Painter = Graphics.FromImage(back);
DrawRect(Painter, Mouse_x, Mouse_y);
return back;
}
private void MoveRect(Image image, Rectangle Rect)
{
Graphics Painter = Graphics.FromImage(image);
Painter.DrawRectangle(pen, Rect.X, Rect.Y, Rect.Width, Rect.Height);
DrawRects(Painter);
MainPainter.DrawImage(image, 0, 0);
image.Dispose();
}
到這裡,代碼就算是寫完了,運行
http://www.cnblogs.com/kevin-wu/archive/2006/12/24/601989.html
