C++模拟鼠标事件

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：

dx
Type: LONG

The absolute position of the mouse, or the amount of motion since the last mouse event was generated, depending on the value of the dwFlags member. Absolute data is specified as the x coordinate of the mouse; relative data is specified as the number of pixels moved.

dy
Type: LONG

The absolute position of the mouse, or the amount of motion since the last mouse event was generated, depending on the value of the dwFlags member. Absolute data is specified as the y coordinate of the mouse; relative data is specified as the number of pixels moved.

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The 'mouse_event()' function has been superseded by 'SendInput()' on Window NT/2000/XP.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.