[英]What does “Invalid managed/unmanaged type combination.” mean?
I have the following struct: 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];
}
Based on the C++ struct: 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;
And the following function: 并具有以下功能:
[DllImport(@"Bird.dll", CallingConvention = CallingConvention.Cdecl)]
private static extern bool birdGetSystemConfig(
int nGroupID,
ref BIRDSYSTEMCONFIG psyscfg,
bool bGetDriverCopy
);
Based on the C++ function: 基于C ++函数:
BOOL DLLEXPORT birdGetSystemConfig(int nGroupID, BIRDSYSTEMCONFIG *psyscfg, BOOL bGetDriverCopy = FALSE);
Which I call like this: 我称之为:
BIRDSYSTEMCONFIG sysconf = new BIRDSYSTEMCONFIG();
birdGetSystemConfig(1, ref sysconf, true);
But get an error telling me: 但是告诉我一个错误:
Cannot marshal 'parameter #2': Invalid managed/unmanaged type combination.
无法编组'参数#2':无效的托管/非托管类型组合。
What does that mean? 这意味着什么? Why does it occur?
它为什么会发生? How can I overcome it?
我怎么能克服它? All suggestions welcome!
欢迎所有建议!
Turns out all I needed to do was change: 事实证明我需要做的就是改变:
[StructLayout(LayoutKind.Auto,Pack=0)]
To 至
[StructLayout(LayoutKind.Sequential,Pack=0)]
Since the question was about more than just how to solve it, I'll leave it open for a while. 既然问题不仅仅是如何解决它,我还会暂时搁置它。 It'd be nice to find out a bit more about this error.
很高兴找到关于这个错误的更多信息。
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