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我有以下結構:什麼是「託管/非託管類型組合無效」。意思?
[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];
}
基於C++的結構:
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;
而下面的功能:
[DllImport(@"Bird.dll", CallingConvention = CallingConvention.Cdecl)]
private static extern bool birdGetSystemConfig(
int nGroupID,
ref BIRDSYSTEMCONFIG psyscfg,
bool bGetDriverCopy
);
基於C++函數:
BOOL DLLEXPORT birdGetSystemConfig(int nGroupID, BIRDSYSTEMCONFIG *psyscfg, BOOL bGetDriverCopy = FALSE);
我稱之爲是這樣的:
BIRDSYSTEMCONFIG sysconf = new BIRDSYSTEMCONFIG();
birdGetSystemConfig(1, ref sysconf, true);
但得到一個錯誤,告訴我:
不能元帥參數#2「:無效 管理/非託管類型組合。
這是什麼意思?爲什麼會發生?我如何克服它?歡迎所有建議!
您應該發佈原始的C++結構。 – 2011-04-15 02:06:09
好主意。編輯。 – 2011-04-15 02:10:10
看看這裏:http://www.groupsrv.com/dotnet/about24649.html – sajoshi 2011-04-15 02:38:41