代码

void CALLBACK MessageCallback(LONG lCommand, NET_DVR_ALARMER *pAlarmer, char *pAlarmInfo, DWORD dwBufLen, void *pUser)
{printf("enter MessageCallback---------------------->\n");int i;NET_DVR_ALARMINFO_V30 struAlarmInfo;memcpy(&struAlarmInfo, pAlarmInfo, sizeof(NET_DVR_ALARMINFO_V30));printf("lCommand is %d, alarm type is %d\n", lCommand, struAlarmInfo.dwAlarmType);switch (lCommand){case COMM_ITS_PLATE_RESULT:// 交通抓拍结果上传(新报警信息类型){printf("COMM_ITS_PLATE_RESULT-------->\n");NET_ITS_PLATE_RESULT struITSPlateResult;memcpy(&struITSPlateResult, pAlarmInfo, sizeof(NET_ITS_PLATE_RESULT));printf("号牌VehNo: %s\n", struITSPlateResult.struPlateInfo.sLicense);string vehNoStr = struITSPlateResult.struPlateInfo.sLicense;cout << "号牌GbkToUtf8:" << GbkToUtf8(vehNoStr) << endl;printf("PlateType:%d\n", struITSPlateResult.struPlateInfo.byPlateType);printf("IP:%s\n", pAlarmer->sDeviceIP);printf("Date:%04d-%02d-%02d %02d:%02d:%02d \n", struITSPlateResult.struSnapFirstPicTime.wYear, struITSPlateResult.struSnapFirstPicTime.byMonth, struITSPlateResult.struSnapFirstPicTime.byDay, struITSPlateResult.struSnapFirstPicTime.byHour, struITSPlateResult.struSnapFirstPicTime.byMinute, struITSPlateResult.struSnapFirstPicTime.bySecond);printf("VehType:%d\n", struITSPlateResult.byVehicleType);}break;default:break;}
}

输出

直接通过

 printf("号牌VehNo: %s\n", struITSPlateResult.struPlateInfo.sLicense);

输出号牌信息，号牌中的汉字是乱码，通过如下GbkToUtf8转换后输出正常。GbkToUtf8相关代码如下：

#include <iostream>
#include <string.h>
#include <iconv.h>using namespace std;// 编码转换，source_charset是源编码，to_charset是目标编码
std::string code_convert(char *source_charset, char *to_charset, const std::string &sourceStr) // sourceStr是源编码字符串
{iconv_t cd = iconv_open(to_charset, source_charset); // 获取转换句柄，void*类型if (cd == 0)return "";size_t inlen = sourceStr.size();size_t outlen = 255;char *inbuf = (char *)sourceStr.c_str();char outbuf[255]; // 这里实在不知道需要多少个字节，这是个问题// char *outbuf = new char[outlen]; 另外outbuf不能在堆上分配内存，否则转换失败，猜测跟iconv函数有关memset(outbuf, 0, outlen);char *poutbuf = outbuf; // 多加这个转换是为了避免iconv这个函数出现char(*)[255]类型的实参与char**类型的形参不兼容if (iconv(cd, &inbuf, &inlen, &poutbuf, &outlen) == -1)return "";std::string strTemp(outbuf); // 此时的strTemp为转换编码之后的字符串iconv_close(cd);return strTemp;
}// gbk转UTF-8
std::string GbkToUtf8(const std::string &strGbk) // 传入的strGbk是GBK编码
{return code_convert("gb2312", "utf-8", strGbk);
}// UTF-8转gbk
std::string Utf8ToGbk(const std::string &strUtf8)
{return code_convert("utf-8", "gb2312", strUtf8);
}// gbk转unicode,"UCS-2LE"代表unicode小端模式
std::string GbkToUnicode(const std::string &strGbk) // 传入的strGbk是GBK编码
{return code_convert("gb2312", "UCS-2LE", strGbk);
}// unicode转gbk
std::string UnicodeToGbk(const std::string &strGbk) // 传入的strGbk是GBK编码
{return code_convert("UCS-2LE", "gb2312", strGbk);
}int main()
{string strUnicode = GbkToUnicode("汉字测试"); // 转成unicostring strUtf8 = GbkToUtf8("汉字测试");       // 转成utf8编码return 0;
}

参考：linux下字符编码转换 - 简书