我正在尝试使用 Marshal 在 C# 中获得以下工作 C++ DLL 代码。它有两个结构体,它们在导出的 API 中作为指针参数传递,但它在 C# 中给出的结构体响应值的顺序不正确。而它在 VC++ 中运行良好。
//C++ Code - Working
//Structure 1
typedef struct
{
bool bExist;
bool bAvailable;
int iNoteNumber;
int iDispenseNumber;
int iOutNoteNumber;
char cStatus;
char acBoxID[6];
} tHopperStatus;
//Structure 2
typedef struct
{
char acCurrency[4];
int lDenomination;
int iRemainCount;
int iCount;
int iOutCount;
int iRejectCount;
int iPurgeCount;
BYTE byHopper;
char cStatus;
char cLastStatus;
char acBoxID[6];
BYTE byBoxType;
char acReserved1[10];
char acReserved2[10];
int iReserverd1;
int iReserverd2;
} tCashBox;
//API using above two structures
int iGetCassette(tCashBox* p_psCashBox,tDevReturn* p_psStatus);
//Calling API by passing pointer of Structure Array
tCashBox l_asBox[8] = {0};
tDevReturn l_asReturn[8] = {0};
int l_iRes = l_pDev->iGetCassette(l_asBox, l_asReturn);
我在 C# 中实现的内容:
//C# Code
//Structure 1
[StructLayout(LayoutKind.Sequential)]
unsafe public struct tDevReturn
{
public tDevReturn(int param)
{
iLogicCode = 0;
iPhyCode = 0;
iHandle = 0;
iType = 0;
acDevReturn = new char[128];
acReserve = new char[128];
}
public int iLogicCode;
public int iPhyCode;
public int iHandle;
public int iType;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 128)]
public char[] acDevReturn;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 128)]
public char[] acReserve;
}
//Structure 2
[StructLayout(LayoutKind.Sequential)]
unsafe public struct tCashBox
{
public tCashBox(int param)
{
acCurrency = new char[4];
lDenomination = 0;
iRemainCount = 0;
iCount = 0;
iOutCount = 0;
iRejectCount = 0;
iPurgeCount = 0;
byHopper = 0;
cStatus = '\0';
cLastStatus = '\0';
acBoxID = new char[6];
byBoxType = 0;
acReserved1 = new char[10];
acReserved2 = new char[10];
iReserverd1 = 0;
iReserverd2 = 0;
}
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 4)]
public char[] acCurrency;
public long lDenomination;
public int iRemainCount;
public int iCount;
public int iOutCount;
public int iRejectCount;
public int iPurgeCount;
public byte byHopper;
public char cStatus;
public char cLastStatus;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 6)]
public char[] acBoxID;
public byte byBoxType;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 10)]
public char[] acReserved1;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 10)]
public char[] acReserved2;
public int iReserverd1;
public int iReserverd2;
}
//API Import Declaration
[DllImport("xxxxxxxxxx.dll", CallingConvention = CallingConvention.StdCall)]
public static extern int CDM_iGetCassette([In, Out] tCashBox[] p_psCashBox, [In, Out] tDevReturn[] p_psStatus);
//API Call - but filling up the structure array with random values and incorrect sequence
tDevReturn[] response = new tDevReturn[8];
tCashBox[] cashboxData = new tCashBox[8];
int ret = Wrapper.CDM_iGetCassette(cashboxData, response);
我有一个疑问,在 C# 中是否允许以这种方式传递结构数组,而在 C++ 中它正在工作。如果有人可以帮助我,这将是一个很大的帮助。提前致谢。
编辑:我将“lDenomination”的数据类型从 long 更改为 int。现在,数组第一个元素被正确填充。但是结构数组的其余七个元素没有被填满。
如果有人可以帮助我,如何创建具有顺序内存的所有元素的结构数组。
最终通过以下更新的结构 2 解决了该问题: 1. 将“lDenomination”的数据类型从 long 更改为 int。2.在结构体布局参数中增加了Pack=1和CharSet=CharSet.Ansi。
[StructLayout(LayoutKind.Sequential, Pack = 1, CharSet = CharSet.Ansi)]
public struct tCashBox
{
public tCashBox(int param)
{
acCurrency = new char[4];
lDenomination = 0;
iRemainCount = 0;
iCount = 0;
iOutCount = 0;
iRejectCount = 0;
iPurgeCount = 0;
byHopper = 0;
cStatus = '\0';
cLastStatus = '\0';
acBoxID = new char[6];
byBoxType = 0;
acReserved1 = new char[10];
acReserved2 = new char[10];
iReserverd1 = 0;
iReserverd2 = 0;
}
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 4)]
public char[] acCurrency;
public int lDenomination;
public int iRemainCount;
public int iCount;
public int iOutCount;
public int iRejectCount;
public int iPurgeCount;
public byte byHopper;
public char cStatus;
public char cLastStatus;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 6)]
public char[] acBoxID;
public byte byBoxType;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 10)]
public char[] acReserved1;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 10)]
public char[] acReserved2;
public int iReserverd1;
public int iReserverd2;
}
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