Re: [問題] Callback 函式 (C# 呼叫 C++ dll) (用 …
→ percyy:嗯...什麼意思? @@"
如果這程式有問題的話, 應該在runtime會有exception呀?
DllImport 不到進入點, 應該會有找不到進入點的exception,
calling converntion或參數大小不到, 應該會告訴你 stack 爛掉 的excetion
callback function pointer有誤, C/C++端呼叫時說不定會直接當掉..
或是 delegate 被GC回收了, 在debug環境下, 應該也會有exception
如果你什麼 exception都沒收到,
要不是被你自己catch起來和諧掉了, 就是C/C++那邊根本沒有呼叫該callback
推 cplusplus:基本上 unmanaged C++ 不能直接call C#的method...
這確定可以呼叫 @.@
舉個例子, 用 CreateThread() Windows API 來 create thraed,
而非使用 .NET 的 Thread Class
--
/*
* 這理是 p/invoke 相關的宣告
*/
delegate Int32 ThreadStartDelegate(IntPtr arg);
[DllImport("kernel32.dll")]
static extern IntPtr CreateThread(
IntPtr SecurityAttributes,
uint StackSize,
ThreadStartDelegate StartFunction,
IntPtr ThreadParameter, uint CreationFlags, out uint ThreadId);
/*
* 這裡是使用該 p/invoke 的 code
*/
// CreateThread 在 .NET 的 callback
Int32 MyThread(IntPtr arg)
{
Console.WriteLine("Hello World");
}
// 呼叫 CreateThread
int tid;
IntPtr h;
ThreadStartDelegate td = new ThreadStartDelegate(MyThread);
h = CreateThread(IntPtr.Zero, 0, td, IntPtr.Zero, 0, out tid);
// 這裡應該還要放個 WaitForSingleObject 等 Thread 結束....
GC.KeepAlive(td);
--
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※ 編輯: cole945 來自: 123.204.66.43 (09/17 01:03)
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