Click事件 = WM_LBUTTONDOWN、WM_LBUTTONUP在lParam参数中决定点击位置（控件客户区坐标！） WM_LBUTTONDOWN The WM_LBUTTONDOWN message is posted when the user presses the left mouse button while the cursor is in the client area of a window. If the mouse is not captured, the message is posted to the window beneath the cursor. Otherwise, the message is posted to the window that has captured the mouse. WM_LBUTTONDOWN fwKeys = wParam; // key flags xPos = LOWORD(lParam); // horizontal position of cursor yPos = HIWORD(lParam); // vertical position of cursor
Parameters fwKeys Value of wParam. Indicates whether various virtual keys are down. This parameter can be any combination of the following values: Value Description MK_CONTROL Set if the ctrl key is down. MK_LBUTTON Set if the left mouse button is down. MK_MBUTTON Set if the middle mouse button is down. MK_RBUTTON Set if the right mouse button is down. MK_SHIFT Set if the shift key is down. xPos Value of the low-order word of lParam. Specifies the x-coordinate of the cursor. The coordinate is relative to the upper-left corner of the client area. yPos Value of the high-order word of lParam. Specifies the y-coordinate of the cursor. The coordinate is relative to the upper-left corner of the client area. Return Values If an application processes this message, it should return zero. Res An application can use the MAKEPOINTS macro to convert the lParam parameter to a POINTS structure. QuickInfo Windows NT: Requires version 3.1 or later. Windows: Requires Windows 95 or later. Windows CE: Requires version 1.0 or later. Header: Declared in winuser.h.WM_LBUTTONUP The WM_LBUTTONUP message is posted when the user releases the left mouse button while the cursor is in the client area of a window. If the mouse is not captured, the message is posted to the window beneath the cursor. Otherwise, the message is posted to the window that has captured the mouse. WM_LBUTTONUP fwKeys = wParam; // key flags xPos = LOWORD(lParam); // horizontal position of cursor yPos = HIWORD(lParam); // vertical position of cursor
Parameters fwKeys Value of wParam. Indicates whether various virtual keys are down. This parameter can be any combination of the following values: Value Description MK_CONTROL Set if the ctrl key is down. MK_MBUTTON Set if the middle mouse button is down. MK_RBUTTON Set if the right mouse button is down. MK_SHIFT Set if the shift key is down. xPos Value of the low-order word of lParam. Specifies the x-coordinate of the cursor. The coordinate is relative to the upper-left corner of the client area. yPos Value of the high-order word of lParam. Specifies the y-coordinate of the cursor. The coordinate is relative to the upper-left corner of the client area. Return Values If an application processes this message, it should return zero. Res An application can use the MAKEPOINTS macro to convert the lParam parameter to a POINTS structure. QuickInfo Windows NT: Requires version 3.1 or later. Windows: Requires Windows 95 or later. Windows CE: Requires version 1.0 or later. Header: Declared in winuser.h.
可能我没有说清楚，button所在的窗口并非前台活动窗口，否则我点一下鼠标左键就完事了，何必送消息呢！
str1 = SendMessage(str, BM_CLICK, 0, 0)
这里str为button的句柄，返回值为0，说明调用不成功！
WM_LBUTTONDOWN
The WM_LBUTTONDOWN message is posted when the user presses the left mouse button while the cursor is in the client area of a window. If the mouse is not captured, the message is posted to the window beneath the cursor. Otherwise, the message is posted to the window that has captured the mouse. WM_LBUTTONDOWN
fwKeys = wParam; // key flags
xPos = LOWORD(lParam); // horizontal position of cursor
yPos = HIWORD(lParam); // vertical position of cursor
Parameters
fwKeys
Value of wParam. Indicates whether various virtual keys are down. This parameter can be any combination of the following values: Value Description
MK_CONTROL Set if the ctrl key is down.
MK_LBUTTON Set if the left mouse button is down.
MK_MBUTTON Set if the middle mouse button is down.
MK_RBUTTON Set if the right mouse button is down.
MK_SHIFT Set if the shift key is down.
xPos
Value of the low-order word of lParam. Specifies the x-coordinate of the cursor. The coordinate is relative to the upper-left corner of the client area.
yPos
Value of the high-order word of lParam. Specifies the y-coordinate of the cursor. The coordinate is relative to the upper-left corner of the client area.
Return Values
If an application processes this message, it should return zero. Res
An application can use the MAKEPOINTS macro to convert the lParam parameter to a POINTS structure. QuickInfo
Windows NT: Requires version 3.1 or later.
Windows: Requires Windows 95 or later.
Windows CE: Requires version 1.0 or later.
Header: Declared in winuser.h.WM_LBUTTONUP
The WM_LBUTTONUP message is posted when the user releases the left mouse button while the cursor is in the client area of a window. If the mouse is not captured, the message is posted to the window beneath the cursor. Otherwise, the message is posted to the window that has captured the mouse. WM_LBUTTONUP
fwKeys = wParam; // key flags
xPos = LOWORD(lParam); // horizontal position of cursor
yPos = HIWORD(lParam); // vertical position of cursor
Parameters
fwKeys
Value of wParam. Indicates whether various virtual keys are down. This parameter can be any combination of the following values: Value Description
MK_CONTROL Set if the ctrl key is down.
MK_MBUTTON Set if the middle mouse button is down.
MK_RBUTTON Set if the right mouse button is down.
MK_SHIFT Set if the shift key is down.
xPos
Value of the low-order word of lParam. Specifies the x-coordinate of the cursor. The coordinate is relative to the upper-left corner of the client area.
yPos
Value of the high-order word of lParam. Specifies the y-coordinate of the cursor. The coordinate is relative to the upper-left corner of the client area.
Return Values
If an application processes this message, it should return zero. Res
An application can use the MAKEPOINTS macro to convert the lParam parameter to a POINTS structure. QuickInfo
Windows NT: Requires version 3.1 or later.
Windows: Requires Windows 95 or later.
Windows CE: Requires version 1.0 or later.
Header: Declared in winuser.h.
这个我明白。
关键是窗口的botton按钮并不是固定在某个位置不动的，还有最小化的时候。
鼠标点击方法不太合适。