[英]Calling C++ method from C# with pointer parameter (WCT)
我不熟悉从C#调用C ++方法的概念。
假设我想从C#调用C ++函数GetThreadWaitChain
:
https://msdn.microsoft.com/en-us/library/windows/desktop/ms679364(v=vs.85).aspx https://msdn.microsoft.com/en-us/library/windows/desktop/ ms681623(v = vs.85)的.aspx
我已经构建了一个调用所依赖的其他类型的模型:
[DllImport("Advapi32.dll")]
public static extern void CloseThreadWaitChainSession(IntPtr WctHandle);
[DllImport("Advapi32.dll")]
public static extern HANDLE OpenThreadWaitChainSession(UInt32 Flags, UInt32 callback);
[DllImport("Advapi32.dll")]
public static extern BOOL GetThreadWaitChain(
IntPtr WctHandle,
UInt32 Context,
UInt32 flags,
UInt32 ThreadId,
WAITCHAIN_NODE_INFO NodeInfoArray,
UInt32 IsCycle
);
[StructLayout(LayoutKind.Sequential)]
public struct WAITCHAIN_NODE_INFO
{
public UInt32 ObjectType;
public UInt32 ObjectStatus;
public struct LockObject
{
string ObjectName;
UInt64 Timeout;
UInt32 Alertable;
}
public struct ThreadObject
{
UInt32 ProcessId;
UInt32 ThreadId;
UInt32 WaitTime;
UInt32 ContextSwitches;
}
}
如何调用GetThreadWaitChain函数? 它接受指向WAITCHAIN_NODE_INFO结构的指针...
目前,这就是我想出来调用该函数的方法(显然它不起作用):
void CollectWaitInformation(int threadId)
{
var wctHandle = OpenThreadWaitChainSession(0, 0);
WAITCHAIN_NODE_INFO info = new WAITCHAIN_NODE_INFO();
var result = GetThreadWaitChain(wctHandle, 0,
GetThreadWaitChainFlags.WCT_OUT_OF_PROC_COM_FLAG, threadID, info , 0);
}
我的C ++类型是否正确映射到C#类型?
GetThreadWaitChain函数原型不正确。 它应该是:
[DllImport("advapi32.dll", SetLastError = true)]
public static extern bool GetThreadWaitChain(
IntPtr WctHandle,
IntPtr Context,
UInt32 Flags,
int ThreadId,
ref int NodeCount,
[MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 4)]
[In, Out]
WAITCHAIN_NODE_INFO[] NodeInfoArray,
out int IsCycle
);
首次调用时,分配WAITCHAIN_NODE_INFO数组。
WAITCHAIN_NODE_INFO[] data = new WAITCHAIN_NODE_INFO[16];
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