WebA HandleRef is essentially an IntPtr to a handle and a reference to the object the handle belongs to. Using HandleRef prevents the GC from collecting the object until the native … WebMar 18, 2011 · In the "Common C# Overloads" paragraph, at the last overload method, there is a method that requires the IntPtr type of the wParam and lParam. [DllImport ("user32.dll", CharSet = CharSet.Auto, SetLastError = false)] static extern IntPtr SendMessage (HandleRef hWnd, UInt32 Msg, IntPtr wParam, IntPtr lParam);

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WebInitializes a new instance of the HandleRef class with the object to wrap and a handle to the resource used by unmanaged code. C# public HandleRef (object? wrapper, IntPtr handle); Parameters wrapper Object A managed object that should not be finalized until the platform invoke call returns. handle IntPtr WebDec 16, 2014 · C# 给按钮添加小盾牌图标 ... // Send the BCM_SETSHIELD message to the button control SendMessage(new System.Runtime.InteropServices.HandleRef(ThisButton, ThisButton.Handle), BCM_SETSHIELD, new IntPtr(0), new IntPtr(1)); } [System.Runtime.InteropServices.DllImport("user32.dll")] private static extern IntPtr … thom woodard indianapolis

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WebJul 20, 2009 · HandleRef is for making sure that a managed object from which you obtained an unmanaged handle doesn't get collected before you're done with the handle. For example: Code Block MyObject myObject = new MyObject(); IntPtr handle = myObject.GetHandle(); // myObject is eligable for collection now WebC# 可能的GDI+抽绳优化思考,c#,optimization,interop,system.drawing,C#,Optimization,Interop,System.drawing,我试 … WebC# 可能的GDI+抽绳优化思考,c#,optimization,interop,system.drawing,C#,Optimization,Interop,System.drawing,我试图从c GDI+DrawLines函数中获得更高的性能。 当我在代码上运行探查器时，我看到DrawLines函数中花费的几乎一半时间是准备将点数组发送到本机GDI+dll。 thomx