C#keybd_event和mouse_event使用了太多的CPU

Question

我试着自己编程一个宏记录器。我很难弄清楚为什么我的程序占用了这么多CPU。录制程序时，只需要大约0.2%的cpu使用率。在播放时，它的使用率高达25%左右。

为了模拟键盘输入，我调用了打开一个新任务的代码。

var kTask = new Task(() => new KeyboardTask(keys_stop[index], keys[index]));
kTask.Start();

该任务称之为此类：

class KeyboardTask
{
[DllImport("user32.dll")] static extern short VkKeyScan(char ch);
// Import the user32.dll
[DllImport("user32.dll", SetLastError = true)]
static extern void keybd_event(byte bVk, byte bScan, uint dwFlags, int dwExtraInfo);
// Declare some keyboard keys as constants with its respective code
// See Virtual Code Keys: https://msdn.microsoft.com/en-us/library/dd375731(v=vs.85).aspx
public const int KEYEVENTF_EXTENDEDKEY = 0x0001; //Key down flag
public const int KEYEVENTF_KEYUP = 0x0002; //Key up flag
public const int VK_RCONTROL = 0xA3; //Right Control key code
public const int VK_LCONTROL = 0xA2; //Left Control key code
public const int VK_LSHIFT = 0xA0;
public const int VK_RSHIFT = 0xA1;
byte key;
long cooldown;
long cooldown_time = 500;
long delay;
long delay_now;
bool first_press = false;
DateTime lastCooldown;
DateTime start;
DateTime stop;
TimeSpan ts;

public KeyboardTask(long delay, Key run_key)
{
key = (byte)KeyInterop.VirtualKeyFromKey(run_key);
lastCooldown = DateTime.Now;
this.delay = delay;

runOtherKeys();


if (run_key == Key.LeftShift || run_key == Key.RightShift)
{
runShift();
}
else if (run_key == Key.LeftCtrl)
{
runCtrl();
}

}

private void runShift()
{
start = DateTime.Now;
while (delay >= delay_now)
{
stop = DateTime.Now;
ts = (stop - start);
delay_now = (long)ts.TotalMilliseconds;
if (!first_press)
{
keybd_event(key, 0, KEYEVENTF_EXTENDEDKEY, 0);
first_press = true;
}
}
keybd_event(VK_LSHIFT, 0, KEYEVENTF_KEYUP, 0);
keybd_event(VK_RSHIFT, 0x45, KEYEVENTF_KEYUP, 0);
}
private void runCtrl()
{
start = DateTime.Now;
while (delay >= delay_now)
{
stop = DateTime.Now;
ts = (stop - start);
delay_now = (long)ts.TotalMilliseconds;
if (!first_press)
{
keybd_event(VK_LCONTROL, 0x9d, 0, 0);
first_press = true;
}
}
keybd_event(VK_LCONTROL, 0x9d, KEYEVENTF_KEYUP, 0);

}
private void runOtherKeys()
{
start = DateTime.Now;
while (delay >= delay_now)
{
stop = DateTime.Now;
ts = (stop - start);
delay_now = (long)ts.TotalMilliseconds;

if (first_press)
{
cooldown = getCooldown();
if (cooldown >= cooldown_time)
{
lastCooldown = DateTime.Now;
cooldown_time = 33;

keybd_event(key, 0x45, 0, 0);
keybd_event(key, 0x45, KEYEVENTF_KEYUP, 0);

}
}
else
{
lastCooldown = DateTime.Now;
keybd_event(key, 0x45, 0, 0);
keybd_event(key, 0x45, KEYEVENTF_KEYUP, 0);
first_press = true;
}

}
keybd_event(key, 0x45, KEYEVENTF_KEYUP, 0);
}
private long getCooldown()
{
DateTime cooldown_stop = DateTime.Now;
TimeSpan cooldown_timespan = (cooldown_stop - lastCooldown);
return (long)cooldown_timespan.TotalMilliseconds;
}
}

为了模拟鼠标输入，我在这里有一个代码：

public void Start()
{
Task.Run(() => runRecordMouse());      
} 

private void runRecordMouse()
{
DateTime start = DateTime.Now;
DateTime stop;
TimeSpan ts;
long time;
int count = 0;
int max = x_arr.Length;
long delay = delay_arr_mouse[count];
while (count < max)
{

stop = DateTime.Now;
ts = (stop - start);
time = (long)ts.TotalMilliseconds;
if (delay <= time)
{
performMouseEvent(count);
count++;
if (count != max) delay = delay_arr_mouse[count];
start = DateTime.Now;
}

}
}

private void performMouseEvent(int pos)
{
mouse_button = mouse_click_arr[pos];
x = x_arr[pos];
y = y_arr[pos];
if (mouse_button_pre != mouse_button && mouse_button_pre == 1)
{
mouse_event(MOUSEEVENTF_LEFTUP, x, y, 0, 0);
}
if (mouse_button_pre != mouse_button && mouse_button_pre == 2) mouse_event(MOUSEEVENTF_RIGHTUP, x, y, 0, 0);
switch (mouse_button)
{
case 0:
SetCursorPos(x, y); //move
break;
case 1:
if (mouse_button_pre == mouse_button)
{
Drag(x_arr[pos - 1], y_arr[pos - 1], x, y); //left Click drag
}
else
{
mouse_event(MOUSEEVENTF_LEFTDOWN, x, y, 0, 0); //left Click
}
break;
case 2:
mouse_event(MOUSEEVENTF_RIGHTDOWN, x, y, 0, 0); //right Click
break;

}

mouse_button_pre = mouse_button;
}
private static void Drag(int xStart, int yStart, int x, int y)
{

x = x - xStart;
y = y - yStart;
SetCursorPos(xStart, yStart);
mouse_event(MOUSEEVENTF_MOVE, x, y, 0, 0);
}

性能档案器

它是用C#.NET框架编写的。

我的电脑：CPU:AMD Ryzen 5 3600内存：32 GBGPU:AMD Radeon RX 5700

Answer 1

我刚刚添加了

Thread.Sleep(1);

一直循环，现在程序只占用大约0.5%的cpu使用率。