我有一个库的一小部分,我想为其编写一个 .NET 包装器。目前,我正在使用 P/Invoke,但由于我没有库的源代码或大量 C 知识,因此我在编组方面遇到了困难。它到目前为止(有点)工作,但感觉就像一个黑客。
C 签名
typedef struct
{
unsigned short sAddress[MAX_ADDRESS_CHAR_LENGTH + 1];
unsigned short sCallback[MAX_CALLBACK_CHAR_LENGTH + 1];
unsigned short sMessage[(MAX_MESSAGE_CHAR_LENGTH + 1) ];
unsigned short sSmscAddress[MAX_ADDRESS_CHAR_LENGTH+1];
unsigned short sSubject[MAX_SUBJECT_CHAR_LENGTH + 1];
unsigned char msgLength;
unsigned char pduType;
unsigned short msgRef;
unsigned char msgSequence;
unsigned char msgTotal;
EMsgPriority nPriority;
struct tm tTime;
EncodingType encoding;
unsigned char bReceipt;
unsigned long dwDataMask;
struct tm tValidity;
unsigned char nValidityType;
unsigned char bRelativeValidityFlag;
unsigned char isDeliveryAck;
} SMS_MSG_DATA;
unsigned short SmsEncodeMessage( SMS_MSG_DATA* sms_msg, unsigned char* msg_buf,
unsigned short* msg_buf_len );
C# P/调用
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct SMS_MSG_DATA {
[MarshalAs(UnmanagedType.ByValTStr,
SizeConst=SmsEncoding.MAX_ADDRESS_CHAR_LENGTH+1)]
public string sAddress;
[MarshalAs(UnmanagedType.ByValTStr,
SizeConst=SmsEncoding.MAX_CALLBACK_CHAR_LENGTH+1)]
public string sCallback;
[MarshalAs(UnmanagedType.ByValTStr,
SizeConst=SmsEncoding.MAX_MESSAGE_CHAR_LENGTH+1)]
public string sMessage;
[MarshalAs(UnmanagedType.ByValTStr,
SizeConst=SmsEncoding.MAX_ADDRESS_CHAR_LENGTH+1)]
public string sSmscAddress;
[MarshalAs(UnmanagedType.ByValTStr,
SizeConst=SmsEncoding.MAX_SUBJECT_CHAR_LENGTH+1)]
public string sSubject;
public byte msgLength;
public byte pduType;
public ushort msgRef;
public byte msgSequence;
public byte msgTotal;
public EMsgPriority nPriority;
public tm tTime;
public EncodingType encoding;
public byte bReceipt;
public long dwDataMask;
public tm tValidity;
public byte nValidityType;
public byte bRelativeValidityFlag;
public byte isDeliveryAck;
}
[DllImport(Constants.LIB_SMSENCODE)]
public static extern ErrorCode SmsEncodeMessage(ref SMS_MSG_DATA sms_msg,
byte[] msg_buf, ref short msg_buf_len);
本质上,它所做的是获取结构并将其输出为字节数组SMS_MSG_DATA
中的二进制格式。msg_buf
的初始值msg_buf_len
是字节数组的大小,但是当编码完成时,它被设置为实际填充的字节数。
C++/CLI 包装器如何使这个过程变得更容易和更清晰?