windows 简单api应用

//调用系统函数 将鼠标移动到相应位置
[DllImport("user32.dll", EntryPoint = "SetCursorPos")]
public extern static bool SetCursorPos(int x, int y);
//获取当前鼠标的绝对位置
[StructLayout(LayoutKind.Sequential)]
public struct POINT
{
public int X;
public int Y;
}
[DllImport("User32")]
public extern static bool GetCursorPos(out POINT p);
//是否显示鼠标箭头
[DllImport("User32")]
public extern static int ShowCursor(bool bShow);
//调用系统函数 模拟鼠标事件函数
[DllImport("user32", EntryPoint = "mouse_event")]
private static extern int mouse_event(int dwFlags, int dx, int dy, int cButtons, int dwExtraInfo);

例如：
private const int MOUSEEVENTF_LEFTDOWN = 0x0002; //模拟鼠标左键按下
private const int MOUSEEVENTF_LEFTUP = 0x0004; //模拟鼠标左键抬起
private const int MOUSEEVENTF_RIGHTDOWN = 0x0008; //模拟鼠标右键按下
private const int MOUSEEVENTF_RIGHTUP = 0x0010; //模拟鼠标右键抬起
private const int MOUSEEVENTF_ABSOLUTE = 0x8000;//鼠标绝对位置
mouse_event(MOUSEEVENTF_LEFTDOWN|MOUSEEVENTF_LEFTUP | MOUSEEVENTF_ABSOLUTE, 0, 0, 0, 0);//点击  其中 int dx, int dy没有效果
[DllImport("user32.dll")]
static extern IntPtr SetActiveWindow(IntPtr hWnd);//激活窗体
[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool SetForegroundWindow(IntPtr hWnd);//把窗体顶层显示
//获取窗体的句柄，其中第一个参数可以为null，第二个参数是任务管理器中“应用程序的 名称”
[DllImport("user32.dll")]
static extern IntPtr FindWindow(string strClass, string strWindow);
//获取窗口的相对的位置 高宽
[DllImport("user32.dll")]
private static extern bool GetWindowRect(IntPtr hWnd, out RECT lpRect);

[DllImport("user32.dll")]
private static extern bool IsZoomed(IntPtr hWnd);//判断窗口最大化,最大化则返回true
//以什么样的方式显示窗体
[DllImport("user32.dll")]
private static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);

//ShowWindow参数
　private const int SW_SHOWNORMAL = 1;
　private const int SW_RESTORE = 9;
　private const int SW_SHOWNOACTIVATE = 4;
　//SendMessage参数
　private const int WM_KEYDOWN = 0X100;
　private const int WM_KEYUP = 0X101;
　private const int WM_SYSCHAR = 0X106;
　private const int WM_SYSKEYUP = 0X105;
　private const int WM_SYSKEYDOWN = 0X104;
　private const int WM_CHAR = 0X102;
ShowWindow(ParenthWnd, SW_RESTORE); //还原窗口

[DllImport("user32.dll")]
static extern void mouse_event(int flags, int dX, int dY, int buttons, int extraInfo);

const int MOUSEEVENTF_MOVE = 0x1;
const int MOUSEEVENTF_LEFTDOWN = 0x2;
const int MOUSEEVENTF_LEFTUP = 0x4;
const int MOUSEEVENTF_RIGHTDOWN = 0x8;
const int MOUSEEVENTF_RIGHTUP = 0x10;
const int MOUSEEVENTF_MIDDLEDOWN = 0x20;
const int MOUSEEVENTF_MIDDLEUP = 0x40;
const int MOUSEEVENTF_WHEEL = 0x800;
const int MOUSEEVENTF_ABSOLUTE = 0x8000;

protected override bool ProcessCmdKey(ref Message msg, Keys key)
{
const int WM_KEYDOWN = 0x100;
const int WM_SYSKEYDOWN = 0x104;
if ((msg.Msg == WM_KEYDOWN) || (msg.Msg == WM_SYSKEYDOWN))
{
switch (key)
{
case Keys.Down:
mouse_event(MOUSEEVENTF_WHEEL, 0, 0, -100, 0);
break;
case Keys.Up:
mouse_event(MOUSEEVENTF_WHEEL, 0, 0, 100, 0);
break;
}
}
return base.ProcessCmdKey(ref msg, key);
}