| 发表于：2007-10-26 10:14:56 楼主 |
我在做一个屏幕捕捉程序，像qq那样的
完成运行，被捕捉的机器的速度奇慢无比，查看方的显示的当然也是慢的，有什么方法可以降低cpu使用率或着修改哪些地方可以提高性能？
代码：
using system;
using system.collections.generic;
using system.componentmodel;
using system.data;
using system.drawing;
using system.text;
using system.windows.forms;
using system.net.sockets;
using system.threading;
using system.net;
using system.io;
namespace thclient
{
public partial class form1 : form
{
// private socket socket = null;
private networkstream ns = null;
private streamreader sr = null;
private streamwriter sw = null;
private thread tcpthread = null;
private tcpclient tcpclient = null;
memorystream ms = null;
bool iscon = false;
bool iserror = false;
public form1（)
{
initializecomponent（);
}
[system.runtime.interopservices.dllimport（"gdi32.dll")]
private static extern intptr createdc（
string lpszdriver, // 驱动名称
string lpszdevice, // 设备名称
string lpszoutput, // 无用，可以设定位"null"
intptr lpinitdata // 任意的打印机数据
);
[system.runtime.interopservices.dllimportattribute（"gdi32.dll")]
private static extern bool bitblt（
intptr hdcdest, //目标设备的句柄
int nxdest, // 目标对象的左上角的x坐标
int nydest, // 目标对象的左上角的x坐标
int nwidth, // 目标对象的矩形的宽度
int nheight, // 目标对象的矩形的长度
intptr hdcsrc, // 源设备的句柄
int nxsrc, // 源对象的左上角的x坐标
int nysrc, // 源对象的左上角的x坐标
system.int32 dwrop // 光栅的操作值
);
public void capture（)
{
//this.visible = false;
intptr dc1 = createdc（"display", null, null, （intptr)null);
//创建显示器的dc
graphics g1 = graphics.fromhdc（dc1);
//由一个指定设备的句柄创建一个新的graphics对象
system.drawing.image myimage = new bitmap（screen.primaryscreen.bounds.width,
screen.primaryscreen.bounds.height, g1);
//根据屏幕大小创建一个与之相同大小的bitmap对象
graphics g2 = graphics.fromimage（myimage);
//获得屏幕的句柄
intptr dc3 = g1.gethdc（);
//获得位图的句柄
intptr dc2 = g2.gethdc（);
//把当前屏幕捕获到位图对象中
bitblt（dc2, 0, 0, screen.primaryscreen.bounds.width, screen.primaryscreen.bounds.height, dc3, 0, 0,
13369376);
//把当前屏幕拷贝到位图中
g1.releasehdc（dc3);
//释放屏幕句柄
g2.releasehdc（dc2);
//释放位图句柄
ms = new memorystream（);
myimage.save（ms,system.drawing.imaging.imageformat.jpeg);
byte[] b =ms.getbuffer（);
ns.write（b, 0, b.length);
ms.flush（);
// this.picturebox1.image = image.fromstream（ms);
//this.visible = true;
}
private void form1_load（object sender, eventargs e)
{
this.label1.text = "程序启动中....\r\n";
timer1.enabled = true;
}
public void connect（)
{
try
{
while （true)
{
capture（);
}
}
catch（exception ex)
{
// messagebox.show（ex.message);
// messagebox.show（"错误!===\\\\"+ex.message );
sw.dispose（);
sr.dispose（);
ns.dispose（);
iscon = false;
iserror = false;
timer1.enabled = true;
this.label1.text += "远程主机被断开~!";
}
}
//关闭所有流
private void form1_closing（object sender,system.componentmodel.canceleventargs e)
{
}
private void timer1_tick（object sender, eventargs e)
{
if （!iscon)
{
con（);
if （!iserror)
{
timer1.enabled = false;
tcpthread = new thread（new threadstart（connect));
tcpthread.start（);
}
iserror = false;
}
}
public void con（)
{
try
{
this.label1.text += "连接中.....\r\n";
tcpclient = new tcpclient（);
tcpclient.connect（"192.168.1.3", 9420);
if （tcpclient.connected)
{
ns = tcpclient.getstream（);
sr = new streamreader（ns);
sw = new streamwriter（ns);
iscon = true;
this.label1.text += "连接成功\r\n";
}
//iserror = true;
}
catch
{
iserror= true;
this.label1.text += "连接失败!\r\n";
}
}
} |
|
|
|
|
