问题描述

我正在制作一个使用 GameSpy C 代码(GP 部分)的 C# 应用程序.C 代码成功调用回调(这是 C# 代码)，但我收到此错误 Run-Time Check Failure #0 - The value was not proper saved across a function call 之后回调完成.我用 C 代码制作了一个 DLL，如下所示:

I'm making a C# application which is using GameSpy C code (the GP part). The C code is calling a callback (which is C# code) succesfully, but I get this error Run-Time Check Failure #0 - The value of ESP was not properly saved across a function call right after the callback is done. I've made a DLL out of C code, like this:

    // GPCallback
    /////////////
    __declspec(dllexport) typedef void (* GPCallback)(
      GPConnection * connection,
      void * arg,
      void * param
    );

    // gpConnect
    ////////////
    __declspec(dllexport) GPResult gpConnect
    (
      GPConnection * connection,
      const gsi_char nick[GP_NICK_LEN],
      const gsi_char email[GP_EMAIL_LEN],
      const gsi_char password[GP_PASSWORD_LEN],
      GPEnum firewall,
      GPEnum blocking,
      GPCallback callback,
      void * param
    );

C# 是这样称呼它的:

C# is calling it like this:

   unsafe public delegate void GPCallback(
   GPConnection * connection,
   //GPConnectResponseArg arg,
   IntPtr arg,
   IntPtr param
  );

  [DllImport("saketestd.dll")]
  unsafe static extern GPResult gpConnect(
   GPConnection * connection, 
   gsi_char nick, 
   gsi_char email, 
   gsi_char password, 
   GPEnum firewall,
   GPEnum blocking,
   GPCallback callback,
   IntPtr param
  );
  unsafe public bool gpConnectE() {
   bool ret = false;
   try {
    GPResult res;
    debug.AddLine(this.getMethodName() + ": " + "connection before connect: " + connection.ToString("x"));
    fixed (int* pconn = &connection) {
     res = gpConnect(
      pconn,
      this.NICK,
      this.EMAIL,
      this.PASSWORD,
      GPEnum.GP_NO_FIREWALL,
      GPEnum.GP_BLOCKING,
      new GPCallback(this.ConnectResponse),
      IntPtr.Zero
     );
    }
    debug.AddLine(this.getMethodName() + ": " + "connection after connect: " + connection.ToString("x"));
    if (res != GPResult.GP_NO_ERROR) {
     debug.AddLine(this.getMethodName() + ": " + "failed: " + res);
    } else {
     debug.AddLine(this.getMethodName() + ": " + "OK");
     ret = true;
    }
   } catch (Exception ex) {
    debug.Text += ex.ToString();
   }
   return ret;
  }

  unsafe public void ConnectResponse(
   GPConnection * connection,
   //GPConnectResponseArg arg,
   IntPtr argPtr,
   IntPtr param
  ) {
   debug.AddLine(this.getMethodName() + " called with connection: " + (*connection).ToString("x"));
   GPConnectResponseArg arg;
   arg = (GPConnectResponseArg)Marshal.PtrToStructure(argPtr, typeof(GPConnectResponseArg)); 
   if (arg.result == GPResult.GP_NO_ERROR) {
    debug.AddLine(this.getMethodName() + ": Connected to GP");
    this.profileid = arg.profile;
   } else {
    debug.AddLine(this.getMethodName() + ": failed");
    debug.AddLine(this.getMethodName() + ": result: " + arg.result);
    debug.AddLine(this.getMethodName() + ": profile: " + arg.profile);
    debug.AddLine(this.getMethodName() + ": uniquenick: " + arg.uniquenick);
   }
  }

我认为我需要清除回调中的堆栈或更改 DLL 中的调用约定(这可能吗?).还有其他想法吗?

I believe that I need to clear the stack in my callback or change the calling convention in the DLL (is that possible?). Any other ideas?

推荐答案

检查你正在使用的调用约定.

Check the calling conventions you are using.

 [UnmanagedFunctionPointer(CallingConvention.Cdecl)]

参考其他相关问题:从 C 函数回调 - 崩溃

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