ISO8583类使用范例

/*
使用CISO8583Writer类构造报文
*/
bool Get8583Package(BYTE **pBuf, int &nBufLen)
{
    char szDate[5] = {\'\0\'}, szTime[7] = {\'\0\'}, szBatchTransNo[13] = {\'\0\'};
    char szUsers[128] = {\'\0\'}, szDESKey[33] = {\'\0\'}, szBuf[MAX_PATH] = {\'\0\'}, szDevNo[9] = {\'\0\'};
    CISO8583Writer mWriter;
    SYSTEMTIME t;
    GetLocalTime(&t);
    _snprintf(szDate, 5, "%02d%02d", t.wMonth, t.wDay);
    _snprintf(szTime, 7, "%02d%02d%02d", t.wHour, t.wMinute, t.wSecond);
    /* Generator radom des key [16bytes] */
    /* 省略部分准备数据代码 */

    mWriter.WriteField(12, 6, (BYTE *)szTime);
    mWriter.WriteField(13, 4, (BYTE *)szDate);
    mWriter.WriteField(37, 12, (BYTE *)szBatchTransNo);
    mWriter.WriteField(41, 8, (BYTE *)szDevNo);
    mWriter.WriteField(48, 128, (BYTE *)szUsers);
    mWriter.WriteField(55, 132, (BYTE *)szEncryptedDESKey);
    mWriter.WriteField(70, 3, (BYTE *)"929");
    nBufLen = mWriter.GetLength();
    *pBuf = new BYTE[nBufLen];
    assert(*pBuf != NULL);
    mWriter.CopyOut(*pBuf, nBufLen);

    /* Write Debug info */
    #ifdef _DEBUG
    mWriter.WriteToFile(XML_FILE_PATH, CISO8583::XML);
    mWriter.WriteToFile(BIN_FILE_PATH, CISO8583::BIN);
    mWriter.WriteToFile(HEX_FILE_PATH, CISO8583::HEX);
    #endif
}

/* 读取报文 */
void Read8583Package(BYTE *pBuf)
{
    CISO8583Reader mReader;
    int fields[] = {12, 13, 37, 41, 48, 55, 70};
    int nFields = sizeof(fields) / sizeof(int);
    if (!mReader.ReadMessage(pBuf))
        throw "Read package failed";

    /* 检查域存在，如果所有域都存在，返回0。该方法发现第一个不存在的域则返回该域索引 */
    assert(mReader.FieldsExist(fields, nFields) == 0);

    /* 读取第六域 */
    BYTE sBuf[256];
    memset(sBuf, 0, sizeof(sBuf));
    mReader.ReadField(12, sBuf, 6);

    /* 其他域读取相似 */
    /* 将报文写入文件 */
    mReader.WriteToFile(XML_FILE_PATH, CISO8583::XML);
    mReader.WriteToFile(BIN_FILE_PATH, CISO8583::BIN);
    mReader.WriteToFile(HEX_FILE_PATH, CISO8583::HEX);
}

void Test()
{
    BYTE *pBuf = NULL;
    int nLen;
    Get8583Package(pBuf, nLen);
    Read8583Package(pBuf);
}