错误:
对“wpfMouse!wpfMouse.MainWindow+LowLevelMouseProc::Invoke”类型的已垃圾回收委托进行了回调。
这可能会导致应用程序崩溃、损坏和数据丢失。向非托管代码传递委托时,托管应用程序必须让这些委托保持活动状态,直到确信不会再次调用它们。
代码:
private IntPtr SetHook(LowLevelMouseProc proc)
{
using (Process curProcess = Process.GetCurrentProcess())
using (ProcessModule curModule = curProcess.MainModule)
{
return SetWindowsHookEx(WH_MOUSE_LL, HookCallback,
GetModuleHandle(curModule.ModuleName), 0);
}
}private IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
{if (nCode >= 0 && MouseMessages.WM_MOUSEMOVE == (MouseMessages)wParam)
{
hookStruct = (MSLLHOOKSTRUCT)Marshal.PtrToStructure(lParam, typeof(MSLLHOOKSTRUCT));
System.Diagnostics.Debug.WriteLine(hookStruct.pt.x + ", " + hookStruct.pt.y);}
return CallNextHookEx(_hookID, nCode, wParam, lParam);
}
开始找MSDN, http://msdn.microsoft.com/zh-cn/library/4ca6d5z7(VS.80).aspx
加了一个方法
Marshal.FreeCoTaskMem(lParam); 症状还是有.
在我们神奇的博客园上找答案.
发现两位大侠的文章
http://www.cnblogs.com/eashion/archive/2008/12/23/1360673.html
http://www.cnblogs.com/joe62/archive/2009/12/18/1626900.html
正确解决是,用代理. 不直接调用回调函数
private LowLevelMouseProc _proc;
private delegate IntPtr LowLevelMouseProc(int nCode, IntPtr wParam, IntPtr lParam);private IntPtr SetHook(LowLevelMouseProc proc)
{
using (Process curProcess = Process.GetCurrentProcess())
using (ProcessModule curModule = curProcess.MainModule)
{_proc=HookCallback;
return SetWindowsHookEx(WH_MOUSE_LL, proc,
GetModuleHandle(curModule.ModuleName), 0);
}
}