转换字节顺序
从PostgreSQL传来的二进制数据是网络字节顺序的,即高位先到,低位后到.使用时转换成本机字节顺序, 才能万无一失.
//将网络字节序的字节数据,转换成本机字节顺序的:long long netToHost_Int8(byte * bytes, int len = 8){ unsigned long long llv = 0; for (int i = 0; i < len; i++){ llv <<= 8; llv |= bytes; } return llv;}double netToHost_Double(char * chars){ unsigned long long llv = netToHost_Int8((byte*)chars); return *(double*)&llv;}int netToHost_Int4(char * chars){ return (int)netToHost_Int8((byte*)chars, 4);}short netToHost_Int2(char * chars){ return (short)netToHost_Int8((byte*)chars, 2);}
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