我不能通过C#中的句柄设置窗口的透明度吗? [英] can't I set transparency of a window by its handle in c#?
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问题描述
我正在尝试设置所有窗口的透明度.我有以下代码.
i am trying to set transparency of all windows. I have following code.
public partial class Form1 : Form
{
[DllImport("user32.dll")]
static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);
[DllImport("user32.dll")]
static extern int GetWindowLong(IntPtr hWnd, int nIndex);
[DllImport("user32.dll")]
static extern bool SetLayeredWindowAttributes(IntPtr hwnd, uint crKey, byte bAlpha, uint dwFlags);
public const int GWL_EXSTYLE = -20;
public const int WS_EX_LAYERED = 0x80000;
public const int LWA_ALPHA = 0x2;
public Form1()
{
InitializeComponent();
this.Load += new EventHandler(Form1_Load);
}
private void Form1_Load(object sender, EventArgs e)
{
Process[] processlist = Process.GetProcesses();
foreach (Process theprocess in processlist)
{
SetWindowLong(theprocess.Handle, GWL_EXSTYLE,
GetWindowLong(theprocess.Handle, GWL_EXSTYLE) ^ WS_EX_LAYERED);
SetLayeredWindowAttributes(theprocess.Handle, 0, 128, LWA_ALPHA);
}
}
}
执行代码时什么也没发生.
nothing happens when I execute the code.
怎么了?
推荐答案
SetWindowLong
需要一个窗口句柄(hWnd),但您正在向它传递一个进程句柄.
更改
SetWindowLong
takes a window handle (hWnd), but you're passing it a process handle instead.
Change all instances of
theprocess.Handle
到
theProcess.MainWindowHandle
更改后,它可以在我对其进行测试的Windows XP机器上运行.现在,我将不得不修改代码以使窗口恢复正常;)幸运的是,Visual Studio 2010窗口不受影响.
After changing that, it worked on the Windows XP machine I tested it on. Now I'm gonna have to modify the code to get the windows back to normal ;) Luckily, the Visual Studio 2010 window was unaffected.
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