在C＃中使用非托管C ++库

Question

我还在尝试在C＃中使用C ++非托管dll。

我的问题是：

我有一个功能（来自我的dll）： C ++：

INT APIENTRY ReadPIC(HANDLE hComPort, PIC *pic, BYTE PacketData[])
{
BYTE InData[MAX_PACKET];        //Allocate for one packet
INT RetStatus;
INT DatCount;
INT DatCount2 = 0;

switch (pic->BootCmd){
    case COMMAND_READPM: 
    case COMMAND_READEE: 
    case COMMAND_READCFG: 
        break;
    default: return ERROR_INVALID_COMMAND;
}

//Limit to 1 or 2 bytes per addr
if(!pic->BytesPerAddr) return ERROR_BPA_TOO_SMALL;
if(pic->BytesPerAddr > 2) return ERROR_BPA_TOO_BIG;

if(pic->BytesPerBlock < pic->BytesPerAddr) return ERROR_BLOCK_TOO_SMALL;
if(pic->BootDatLen > MAX_PACKET - 6) return ERROR_PACKET_TOO_BIG;

//Build header
InData[0] = pic->BootCmd;
InData[1] = pic->BootDatLen / pic->BytesPerAddr;
InData[2] = (BYTE)(pic->BootAddr & 0xFF);
InData[3] = (BYTE)((pic->BootAddr & 0xFF00) / 0x100);
InData[4] = (BYTE)((pic->BootAddr & 0xFF0000) / 0x10000);

RetStatus = SendGetPacket(hComPort, InData, 5, MAX_PACKET, pic->MaxRetrys);

if(RetStatus < 0) return RetStatus;

for (DatCount = 5; DatCount < RetStatus - 1; DatCount++){
    PacketData[DatCount2] = InData[DatCount];
    DatCount2++;
}

return DatCount2;

}

C＃实施：

       [DllImport(@"PICBOOT.dll")]
       public static extern short ReadPIC(int hComPort, ref PIC pic, ref byte PacketData);

        DevID[0] = (byte)CMD_READ_VERSION;
        DevID[1] = (byte)0;
        short RetStat;
        PIC pic = new PIC();
        pic.BootAddr = 0x3FFFFE;
        pic.BootCmd = (byte)CMD_READ_PROG_MEM;
        pic.BootDatLen = (byte)2;
        pic.MaxRetrys = 3;
        pic.BytesPerBlock = 1;
        pic.BytesPerAddr = 1;


        RetStat = com.Dll_PIC_interface.ReadPIC(PicBoots.PortHandle, ref pic, ref DevID[0]);

我也有一个相同功能的VB示例：

    ReDim DevID(10) As Byte
Dim RetStat

Dim picb As PIC

DevID(0) = CMD_READ_VERSION
DevID(1) = 0
picb.BootAddr = &H3FFFFE
picb.BootCmd = CMD_READ_PROG_MEM
picb.BootDatLen = 2
picb.MaxRetrys = PicBootS.MaxRetry
picb.BytesPerBlock = 1
picb.BytesPerAddr = 1
RetStat = ReadPIC(PicBootS.PortHandle, picb, DevID(0))
If RetStat <= 0 Then
    ReadDeviceID = "0"
Else
    ReadDeviceID = CStr(((DevID(1) * 256) + DevID(0)) \ 32)
End If

C＃one抛出错误（-11）谁必须配合：#define ERROR_BPA_TOO_BIG -11

这是我第一次使用非托管dll，不知道为什么它不知道，我认为我非常接近VB的例子。

C ++结构实现

//PIC structure used for some functions
 typedef struct _PIC {
BYTE BootCmd;
BYTE BootDatLen;        //Number of bytes to read/write
DWORD BootAddr;         //24 bit memory address (Prog or EE)
BYTE BytesPerBlock;
BYTE BytesPerAddr;
WORD MaxRetrys;         //Number of retries before failure
 } PIC;

我的：

    public struct PIC
{
    public byte BootCmd;//{ get; set; }
    public byte BootDatLen ;//{ get; set; }
    public ulong BootAddr ; //{ get; set; }
    public byte BytesPerBlock; //{ get; set; }
    public byte BytesPerAddr ; //{ get; set; }
    public ushort MaxRetrys;  //{ get; set; }
}