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PO"Run-Time Check Failure #0 - The value of ESP was not properly saved across a function call" after successful C# callback from the C++ code
 

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  1. PO"Run-Time Check Failure #0 - The value of ESP was not properly saved across a function call" after successful C# callback from the C++ code
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    <p>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 <code>Run-Time Check Failure #0 - The value of ESP was not properly saved across a function call</code> right after the callback is done. I've made a DLL out of C code, like this:</p> <pre><code> // 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 ); </code></pre> <p>C# is calling it like this:</p> <pre><code> 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); } } </code></pre> <p>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?</p>
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