“无效的托管/非托管类型组合”是什么意思？

我有以下结构：

[StructLayout(LayoutKind.Auto,Pack=0)] private unsafe struct BIRDSYSTEMCONFIG { public byte bySystemStatus; public byte byError; public byte byNumDevices; public byte byNumServers; public byte byXmtrNum; public ushort wXtalSpeed; public double dMeasurementRate; public byte byChassisNum; public byte byNumChassisDevices; public byte byFirstDeviceNum; public ushort wSoftwareRev; public fixed byte byFlockStatus[127]; } 

基于C ++结构：

 typedef struct tagBIRDSYSTEMCONFIG { BYTE bySystemStatus; // current system status (see bird system status bits, above) BYTE byError; // error code flagged by server or master bird BYTE byNumDevices; // number of devices in system BYTE byNumServers; // number of servers in system BYTE byXmtrNum; // transmitter number (see transmitter number bits, above) WORD wXtalSpeed; // crystal speed in MHz double dMeasurementRate; // measurement rate in frames per second BYTE byChassisNum; // chassis number BYTE byNumChassisDevices; // number of devices within this chassis BYTE byFirstDeviceNum; // number of first device in this chassis WORD wSoftwareRev; // software revision of server application or master bird BYTE byFlockStatus[BIRD_MAX_DEVICE_NUM + 1]; // status of all devices in flock, indexed by bird number (see note in BIRDFRAME definition) - see bird flock status bits, above } BIRDSYSTEMCONFIG; 

以下function：

  [DllImport(@"Bird.dll", CallingConvention = CallingConvention.Cdecl)] private static extern bool birdGetSystemConfig( int nGroupID, ref BIRDSYSTEMCONFIG psyscfg, bool bGetDriverCopy ); 

基于C ++函数：

 BOOL DLLEXPORT birdGetSystemConfig(int nGroupID, BIRDSYSTEMCONFIG *psyscfg, BOOL bGetDriverCopy = FALSE); 

我称之为：

 BIRDSYSTEMCONFIG sysconf = new BIRDSYSTEMCONFIG(); birdGetSystemConfig(1, ref sysconf, true); 

但是告诉我一个错误：

无法封送’参数＃2’：无效的托管/非托管类型组合。

那是什么意思？ 它为什么会发生？ 我怎么能克服它？ 欢迎所有建议！

Answer 1

事实certificate我需要做的就是改变：

 [StructLayout(LayoutKind.Auto,Pack=0)] 

至

 [StructLayout(LayoutKind.Sequential,Pack=0)] 

既然问题不仅仅是如何解决它，我还会暂时搁置一下。 很高兴找到关于这个错误的更多信息。