解决：对 PInvoke 函数的调用导致堆栈不对称问题
问题描述：
在使用托管代码调用非托管代码时，发生“对 PInvoke 函数“UseTwiHikVisionDllTest!UseTwiHikVisionDllTest.TwiHikVision::GetFirstPic”的调用导致堆栈不对称。原因可能是托管的 PInvoke 签名与非托管的目标签名不匹配。请检查 PInvoke 签名的调用约定和参数与非托管的目标签名是否匹配。”
解决方法：
添加属性:CallingConvention=CallingConvention.Cdecl
如：
[DllImport("TwiHikVision.dll", EntryPoint="GetFirstPic",CallingConvention=CallingConvention.Cdecl)]
public static extern string GetFirstPic(string videoFileName, string exportFilePath);
网络参考可能原因：
http://social.msdn.microsoft.com/Forums/en-US/csharpgeneral/thread/b0637998-dc89-4ff9-b59d-5ad262a48bc6
You need to set the calling convention. The default convention (stdcall) is not correct, which will cause P/Invoke stack imbalances.
For example, your first call should look like:
[DllImport("Service.dll", CallingConvention=CallingConvention.Cdecl)] static private extern IntPtr CallCreateClass();
By default, C and C++ use cdecl - but marshalling uses stdcall to match the Windows API.