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分享这些参数表示什么意思
我在别人的程序上看到这样的程序段
Private Sub Pic_MouseDown(Button As Integer, Shift As Integer, _
X As Single, Y As Single)
ReleaseCapture
SendMessage Pic.hwnd, &HA1, 2, 0&
End Sub
这样，就可以用mouse来拖动这个Pic控件。
我的问题是，SendMessage Pic.hwnd, &HA1, 2, 0& 这条命令中
&HA1, 2, 0& 这三个常量表示什么意思，也就是说具体是什么消息。
Private Sub Pic_MouseDown(Button As Integer, Shift As Integer, _
X As Single, Y As Single)
ReleaseCapture
SendMessage Pic.hwnd, &HA1, 2, 0&
End Sub
这样，就可以用mouse来拖动这个Pic控件。
我的问题是，SendMessage Pic.hwnd, &HA1, 2, 0& 这条命令中
&HA1, 2, 0& 这三个常量表示什么意思，也就是说具体是什么消息。
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litsnake1 2003-01-03
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来晚拉，同意楼上
这段代码可以实现了：以鼠标拖曳无标题窗体
这段代码可以实现了：以鼠标拖曳无标题窗体
pirateRocy 2003-01-03
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releaseCapture
释放mouse捕获
Const WM_NCLBUTTONDOWN = &HA1
mouse左键在窗体的非客户区按下
Const HTCAPTION = 2
移动窗体的Title
就是以鼠标拖曳无标题窗体
释放mouse捕获
Const WM_NCLBUTTONDOWN = &HA1
mouse左键在窗体的非客户区按下
Const HTCAPTION = 2
移动窗体的Title
就是以鼠标拖曳无标题窗体
Montaque 2003-01-03
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Public Const WM_NCLBUTTONDOWN = &HA1 左键down
Public Const HTCAPTION = 2 就像移动窗体的title一样移动
Public Const HTCAPTION = 2 就像移动窗体的title一样移动
suntt 2003-01-03
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WM_NCLBUTTONDOWN
The WM_NCLBUTTONDOWN message is posted when the user presses the left mouse button while the cursor is within the nonclient area of a window. This message is posted to the window that contains the cursor. If a window has captured the mouse, this message is not posted.
WM_NCLBUTTONDOWN
nHittest = (INT) wParam; // hit-test value
pts = MAKEPOINTS(lParam); // position of cursor
Parameters
nHittest
Value of wParam. Specifies the hit-test value returned by the DefWindowProc function as a result of processing the WM_NCHITTEST message. For a list of hit-test values, see WM_NCHITTEST.
pts
Value of lParam. Specifies aPOINTS structure that contains the x- and y-coordinates of the cursor. The coordinates are relative to the upper-left corner of the screen.
Return Values
If an application processes this message, it should return zero
The WM_NCLBUTTONDOWN message is posted when the user presses the left mouse button while the cursor is within the nonclient area of a window. This message is posted to the window that contains the cursor. If a window has captured the mouse, this message is not posted.
WM_NCLBUTTONDOWN
nHittest = (INT) wParam; // hit-test value
pts = MAKEPOINTS(lParam); // position of cursor
Parameters
nHittest
Value of wParam. Specifies the hit-test value returned by the DefWindowProc function as a result of processing the WM_NCHITTEST message. For a list of hit-test values, see WM_NCHITTEST.
pts
Value of lParam. Specifies aPOINTS structure that contains the x- and y-coordinates of the cursor. The coordinates are relative to the upper-left corner of the screen.
Return Values
If an application processes this message, it should return zero
