问题描述
首先很抱歉，因为对于C#来说，这可能是一个过于本地化的问题，但是无论如何，我都没有找到有关VB.NET的信息，而且我对C#的理解也不是很好.
First of all sorry 'cause maybe this could be a too localized question for C# but anyways I didn't find info about this for VB.NET and I don't understand in a good level C# code.
基本上，我需要从应用程序中捕获/处理一些鼠标消息.
Basically I need to capture/process some mouse messages out of the application.
我该怎么做?
这只是我需要在应用程序外部进行复制的代码示例:
This is just a code example of what I need to reproduce but outside the application:
Protected Overrides Sub WndProc(ByRef m As Message)
Select Case m.Msg
Case &H200 ' WM_MOUSEMOVE
MsgBox("Mouse Move")
Case &H201 ' WM_LBUTTONDOWN
MsgBox("Left Button Down")
Case &H202 ' WM_LBUTTONUP
MsgBox("Left Button Up")
Case Else
MyBase.WndProc(m)
End Select
End Sub
主要思想是按下一个按钮，该按钮将隐藏应用程序，以使用户可以在屏幕上选择一个区域，在这里我需要捕获那些Windows消息，以了解何时需要开始/结束区域选择.
The main idea is to press a button that will hide the application to let the user selects a region over the screen and there is where I need to capture those windows messages to know when I need to start/end the region selection.
推荐答案
有两种方法可以做到这一点.
There are two ways to do this.
-
使用全局挂钩(在Google上使用)我不推荐.
Using global hooks (Google it)I do not recommend.
使您的winform透明.
Making ur winform transparent.
您需要将winform的透明颜色设置为背景控件颜色.要使表单无法定位，您需要将此代码添加到您的消息处理程序中
U need set transparent color of ur winform as the background control color. To make the form unfocusable u need add this code to ur message handler
if (m.Msg == WM_MOUSEACTIVATE)
{
m.Result = new IntPtr(MA_NOACTIVATE);
return;
}
如果您想接收左击消息，只需在MouseActivate消息之前添加此代码即可.
if u want to receive left-click message just add this code before MouseActivate massage.
if (m.Msg == WM_LBUTTONDOWN)
{
}
完整示例
namespace
{
public partial class XXXXXForm : Form
{
private const int WM_MOUSEACTIVATE = 0x21;
private const int WM_LBUTTONDOWN = 0x0201;
private const int MK_LBUTTON = 0x0001;
private const int MA_NOACTIVATE = 3;
public ClockForm()
{
InitializeComponent();
this.DoubleBuffered = true;
this.TopMost = true;
this.FormBorderStyle = FormBorderStyle.None;
this.ShowIcon = false;
this.ShowInTaskbar = false;
this.TransparencyKey = this.BackColor;
}
[DllImport("User32.dll", EntryPoint = "SendMessage")]
private extern static int SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam);
[DllImport("user32.dll")]
public static extern bool ReleaseCapture();
private const int WM_SYSCOMMAND = 0x112;
private const int SC_MOVE = 0xF010;
private const int HTCAPTION = 0x0002;
protected override void WndProc(ref Message m)
{
if (m.Msg == WM_LBUTTONDOWN)
{
...
}
else if (m.Msg == WM_MOUSEACTIVATE)
{
m.Result = new IntPtr(MA_NOACTIVATE);
return;
}
base.WndProc(ref m);
}
protected override bool ShowWithoutActivation
{
get
{
return false;
}
}
private void Form_Paint(object sender, PaintEventArgs e)
{
}
}
}
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