| 发表于：2007-10-20 12:48:021楼 得分:0 |
说一下思路
你要求的功能是不是qq截图所要实现的功能
是的话 继续向下看
因为近来想写个类似于远程桌面监控的程序,该程序中要用到屏幕捕捉.为实现该程序的一部分功能,做了个小demo.程序很简单，用到的技术也不多，只能实现类似qq的截图功能（方法虽然很笨)
程序流程如下： 字串3
字串5
1.截取整个屏幕并保存
2.新开一个全屏窗口,将保存的屏幕作为背景
3.鼠标拖动改变截取范围,右键取消
4.双击截取,保存在粘贴板,全屏窗口关闭
字串3
字串4
好了,下面的是代码部分 字串9
字串5
首先新建一个项目screencutter（vs2005),将窗体名改为mainform,再新建一个窗体screenbody.
添加一个按钮btncutter到screencutter并添加按钮事件:
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（);
字串8
}screen.allscreens[0]是获取当前所有设备窗口的第一个,我这里只有一个显示器,当然我就是第一个.
利用graphics的copyfromscreen函数获取当前屏幕.
字串5
好了,现在按下按钮全屏窗口就会出来了.
字串1
下面讲全屏窗口screenbody,首先设置窗体的formborderstyle为none,然后声明以下变量
private graphics mainpainter; //主画笔
private pen pen; //就是笔咯
private bool isdowned; //判断鼠标是否按下
private bool rectready; //矩形是否绘制完成
private image baseimage; //基本图形（原来的画面)
private rectangle rect; //就是要保存的矩形
private point downpoint; //鼠标按下的点
int tmpx;
int tmpy;
之后就是窗体的鼠标函数了,里面很多代码都没有作出整理,看了一下,整理后的代码应该会更少更精简的 字串9
private void screenbody_doubleclick（object sender, eventargs e)
{
if （（（mouseeventargs)e).button == mousebuttons.left &&rect.contains（（（mouseeventargs)e).x, （（mouseeventargs)e).y))
{
//保存的时候有很多种方法的......我这里只用了这种
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（);
}
}
字串6
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;
}
字串2
}
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;
}
} 字串3
private void screenbody_mousemove（object sender, mouseeventargs e) 字串8
{
字串7
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)
{
字串6
//和上一次的位置比较获取偏移量
rect.x = rect.x + e.x - tmpx;
rect.y = rect.y + e.y - tmpy;
//记录现在的位置
tmpx = e.x;
tmpy = e.y;
moverect（（image)baseimage.clone（), rect);
}
}
}
字串8
}
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;
}
字串6
辅助函数
本来应该写更多的辅助函数的,将窗体响应函数里面的代码放到里面来,不过本人很懒,就这样将就了.呵呵 字串3
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); 字串8
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（);
} 字串9
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