我有一个任务,我有一个问题。我必须读取.ts文件,读取里面的数据包,并从每个数据包中提取标题信息。 我已经创建了一个结构数据包,它将保存标题的所有信息,并且我还有一个向量,在该数据包中我将push_back每个数据包。 问题在于for循环在163rd循环中由于某种原因而停止。如果我循环直到让我说我= 160,然后代码转义结束循环,但是当我打印vector.size()我得到一个非常大的数字,这是没有意义的。我想它应该是一个整数值高达Packets.Here的推回数是代码,我迄今为止:奇怪行为的结构向量C++
int main() {
FILE *ts_file = NULL;
ts_file = fopen64("/home/ddd/Desktop/Assignment/Streams/ddd.ts", "rb");
if (ts_file == NULL){
cout << "No file detected on this path, try again" << endl; // prints !!!Hello World!!!
}
TS_Analyzer *ts_analyzer;
ts_analyzer->parse_file(ts_file);
cout << "Finished main" << endl;
return 0;
}
空隙TS_Analyzer :: parse_file(FILE * ts_file) {
cout << "Inside parser" << endl;
fseek(ts_file,0,SEEK_END);
long file_size = ftell(ts_file);
rewind (ts_file);
number_of_packets = file_size/PACKET_SIZE;
unsigned int current_header_add = 0;
unsigned int i=0;
for (unsigned int j=1; i<number_of_packets; j++)
{
i++;
unsigned char TS_raw_header[4];
cout << "current position " << int(current_header_add) << endl;
current_header_add = ftell(ts_file);
fread(&TS_raw_header, sizeof(TS_raw_header), 1, ts_file);
Packet current_packet;
current_packet.sync_byte = TS_raw_header[0];
current_packet.transport_error_indicator = (TS_raw_header[1] & 0x80) >> 7;
current_packet.payload_start_indicator = (TS_raw_header[1] & 0x40) >> 6;
current_packet.transport_priority = (TS_raw_header[1] & 0x20) >> 5;
current_packet.PID = ((TS_raw_header[1] & 31) << 8) | TS_raw_header[2];
current_packet.transport_scrambling_control = (TS_raw_header[3] & 0xC0);
current_packet.adaption_field_control = (TS_raw_header[3] & 0x30) >> 4;
current_packet.continuity_counter = (TS_raw_header[3] & 0xF);
stream_packets.push_back(current_packet);
//cout << hex << int(current_packet.PID) << endl;
//cout << dec << "continuity counter " << int(current_packet.continuity_counter) << endl;
cout << " i " << int(i) << endl;
fseek(ts_file, 184, SEEK_CUR);
}
cout << "@@" << endl;
cout << stream_packets.size() << endl;
}
类TS_Analyzer:公共分析器{
p ublic: TS_Analyzer(); 〜TS_Analyzer();
struct Packet {
unsigned char sync_byte;
unsigned char transport_error_indicator;
unsigned char payload_start_indicator;
unsigned char transport_priority;
unsigned int PID;
unsigned char transport_scrambling_control;
unsigned char adaption_field_control;
unsigned char continuity_counter;
};
std::vector<Packet>stream_packets;
int number_of_packets = 0;
void parse_file(FILE *);
};
为什么矢量push_back打破for循环以及为什么我无法获得正确的矢量大小的任何想法?
我们可以看到错误吗? –
这不是一个错误,它只是停在163rd循环上。当我把循环让我们说直到111,然后循环完成,如果我打印矢量的大小我得到那11727604084342. – jmfel
什么是PACKET_SIZE?它没有定义。分析仪类的功能是什么?也没有定义。 fopen64()使用...它可以比2GB文件更大吗?在这种情况下,long可能不能包含目标平台上的长度。系统地忽略了各种其他功能(fseek fread等)返回的结果,因此无论如何它都不会将审查作为实际生产代码进行通过。还有未初始化的对象使用了JVApen已经回答的问题,大多数编译器都会抱怨它。 –