C#
我试图有一个空的窗体窗口,但使用工具窗口样式。 但是,调用Show()
导致以下异常:
Win32Exception:该参数不正确。
NativeErrorCode:87
System.Windows.Forms.Form.UpdateLayered()在System.Windows.Forms.Control.WmCreate(消息&m)在System.Windows.Forms.Control.WndProc(消息&m)在System.Windows.Forms.Form.WmCreate (Message&m)at System.Windows.Forms.Form.WndProc(Message&m)at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd,Int32 msg,IntPtr wparam,IntPtr lparam)
错误代码87是ERROR_INVALID_PARAMETER。
private class ToolForm : Form {
public ToolForm() {
AllowTransparency = true;
BackColor = System.Drawing.Color.FromArgb(0, 0, 1);
TransparencyKey = BackColor;
}
private const int WS_EX_TOOLWINDOW = 0x00000080;
protected override CreateParams CreateParams {
get {
var cp = base.CreateParams;
cp.ExStyle = WS_EX_TOOLWINDOW;
return cp;
}
}
}
编辑:
这工作:
public class ToolForm : Form {
public ToolForm() {
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.SizableToolWindow;
this.AllowTransparency = true;
this.BackColor = Color.FromArgb(0, 0, 1);
this.TransparencyKey = this.BackColor;
}
}
首先尝试使用OR分配而不是纯分配:
cp.ExStyle |= WS_EX_TOOLWINDOW;
如果这不起作用,您可以尝试额外处理以下某些相关样式:
cp.ExStyle |= ( int )(
WS_EX_LAYERED |
WS_EX_TRANSPARENT |
WS_EX_NOACTIVATE |
WS_EX_TOOLWINDOW );
相关的值是:
WS_EX_LAYERED = 0x00080000,
WS_EX_NOACTIVATE = 0x08000000,
WS_EX_TOOLWINDOW = 0x00000080,
WS_EX_TRANSPARENT = 0x00000020
WS_EX_TRANSPARENT
标志可能允许您需要的TransparencyKey = BackColor;
而不需要TransparencyKey = BackColor;
线。
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