C++ unsigned long 转化为 unsigned char*

C++ Code

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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