我有一個用C語言編寫的DLL,其中包含導出的函數,該函數具有一個函數指針,可用作回調函數.
// C++
DllExport unsigned int DllFunctionPointer( unsigned int i, unsigned int (*TimesThree)( unsigned int number ) ) {
return TimesThree( i ) ;
}
我有一個CSharp應用程式,我想用它來調用DLL函數.
// C#
public unsafe delegate System.UInt32 CallBack( System.UInt32 number );
class Program
{
[DllImport("SimpleDLL.dll")]
public static extern System.UInt32 DllFunctionPointer( System.UInt32 i, CallBack cb) ;
static unsafe void Main(string[] args)
{
System.UInt32 j = 3;
System.UInt32 jRet = DllFunctionPointer(j, CallBack );
System.Console.WriteLine("j={0}, jRet={1}", j, jRet);
}
static System.UInt32 CallBack( System.UInt32 number ) {
return number * 3 ;
}
}
上述代碼的問題是應用程式崩潰時出現以下錯誤消息.
'CallingACallbackFromADLL.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\XXXX\CallingACallbackFromADLL.exe', Symbols loaded.
Managed Debugging Assistant 'PInvokeStackImbalance' has detected a problem in 'C:\XXXX\CallingACallbackFromADLL.vshost.exe'.
Additional Information: A call to PInvoke function 'CallingACallbackFromADLL!CallingACallbackFromADLL.Program::DllFunction' has unbalanced the stack. This is likely because the managed PInvoke signature does not match the unmanaged target signature. Check that the calling convention and parameters of the PInvoke signature match the target unmanaged signature.
The program '[9136] CallingACallbackFromADLL.vshost.exe: Managed (v4.0.30319)' has exited with code 1073741855 (0x4000001f).
我不知道下一步該做什麼.
我的問題是：
>調用包含C#應用程式的Callback指針的C DLL函數的正确方法是什麼.