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unsigned long lFileLen = 1000;

unsigned char *ucFileLenFlag;

ucFileLenFlag = (unsigned char *) &lFileLen; //方法一



//方法二：

ucFileLenFlag = new unsigned char [4];//数组指针

ucFileLenFlag[3] = ((unsigned char *)&lFileLen)[3]; //取i(long)最高位
ucFileLenFlag[2] = ((unsigned char *)&lFileLen)[2];
ucFileLenFlag[1] = ((unsigned char *)&lFileLen)[1];
ucFileLenFlag[0] = ((unsigned char *)&lFileLen)[0]; //取i(long)最低位