c++模拟鼠标事件，一般可以通过mouse_event()和SendInPut()两种方法。mouse_event()在windows后期版本中逐渐被SendInPut()取代。SendInPut()模拟鼠标移动的事件中，标志位取值不同，输入坐标的意义也不同。简单来说就是，添加MOUSEEVENTF_ABSOLUTE标志位表示鼠标移动是通过绝对坐标定位，此时的坐标要通过转换。光标在屏幕中被分成65535个小块，可以通过如下转换：

  double fx = x*(65535.0f/fScreenWidth);
  double fy = y*(65535.0f/fScreenHeight);

若不使用MOUSEEVENTF_ABSOLUTE标志位，则坐标是相对前一坐标的位移。

SendInPut()鼠标事件使用如下结构：

typedef struct tagMOUSEINPUT {
  LONG      dx;
  LONG      dy;
  DWORD     mouseData;
  DWORD     dwFlags;
  DWORD     time;
  ULONG_PTR dwExtraInfo;
} MOUSEINPUT, *PMOUSEINPUT;

msdn中完整解释如下：

以下是摘自网络上的一段FAQ，代码演示了鼠标的几个具体操作。

Q: How can I emulate mouse events in an application?

A:

• There are two API fucntions that you can use:
  
  
  • 'mouse_event()'.
  • 'SendInput()'.
  
  
• Which of the two API functions should I use?
  
  The 'mouse_event()' function has been superseded by 'SendInput()' on Window NT/2000/XP. Thus, on these operating systems you should use 'SendInput()' (unless you need to provide backward compatibility with Windows 98 etc.). This FAQ is based on 'SendInput()'.
  
  
• Can I see some example on how to use 'SendInput()' to emulate a click with the left mouse button?
  
  
  
  Code:
  
  void LeftClick ( )
  { 
    INPUT    Input={0};
    // left down
    Input.type      = INPUT_MOUSE;
    Input.mi.dwFlags  = MOUSEEVENTF_LEFTDOWN;
    ::SendInput(1,&Input, sizeof(INPUT));
  
    // left up
    ::ZeroMemory(&Input, sizeof(INPUT));
    Input.type      = INPUT_MOUSE;
    Input.mi.dwFlags  = MOUSEEVENTF_LEFTUP;
    ::SendInput(1,&Input, sizeof(INPUT));
  }
• How to use the function?
  
  
  
  Code:
  LeftClick();
  The left click will be performed on the current position of the mouse cursor.
  
  
• Can I see some example on how to use 'SendInput()'
  to emulate a click with the right mouse button?
  
  
  
  Code:
  
  void RightClick ( )
  { 
    INPUT    Input={0};
    // right down
    Input.type      = INPUT_MOUSE;
    Input.mi.dwFlags  = MOUSEEVENTF_RIGHTDOWN;
    ::SendInput(1,&Input, sizeof(INPUT));
  
    // right up
    ::ZeroMemory(&Input, sizeof(INPUT));
    Input.type      = INPUT_MOUSE;
    Input.mi.dwFlags  = MOUSEEVENTF_RIGHTUP;
    ::SendInput(1,&Input, sizeof(INPUT));
  }
• How to use the function?
  
  
  
  Code:
  
  RightClick();
  The right click will be performed on the current position of the mouse cursor.
  
  
• Can I see some example on how to use 'SendInput()' for emulating mouse movement?
  
  
  
  Code:
  
  void MouseMove ( int x, int y )
  { 
    double fScreenWidth    = ::GetSystemMetrics( SM_CXSCREEN )-1;
    double fScreenHeight  = ::GetSystemMetrics( SM_CYSCREEN )-1;
    double fx = x*(65535.0f/fScreenWidth);
    double fy = y*(65535.0f/fScreenHeight);
    INPUT  Input={0};
    Input.type      = INPUT_MOUSE;
    Input.mi.dwFlags  = MOUSEEVENTF_MOVE|MOUSEEVENTF_ABSOLUTE;
    Input.mi.dx = fx;
    Input.mi.dy = fy;
    ::SendInput(1,&Input, sizeof(INPUT));
  }
• How to use the function?
  
  
  
  Code:
  
  MouseMove(100,100);
  This call will move the mouse cursor to the position 100/100 on the screen.

Thanks to cilu for helping writing this FAQ.