[英]ofstream not outputting when I don't have a endl c++
我有一个客户端/服务器套接字程序,该程序将文件数据包写入char [2048]中,我已确保在通过套接字发送之前100%确保将所有数组都终止为null。
但是在服务器端,如果我没有endl,则无法将ofstream输出到文件,但是,此endl会在数据包的末尾插入自身,并使文件在我不希望的位置包含换行符他们去。
这是相关的代码
客户
void Copy(char *filename1,string filename2,int Sockfd) {
const int BUFSIZE=2048;
char buffer[BUFSIZE];
ifstream fin;
long filelen, bytesRemaining, bytes;
// Open the file to be transferred, check it exists.
fin.open( filename1);
if (!fin.good()) {
cerr << "Problems opening \"" << filename1 << "\" (" << errno << "): " << strerror(errno) << endl;
exit(1);
}
// Determine the file's length.
fin.seekg(0,ios::end);
if(fin.fail()) cerr<<"seekg() fail!\n";
filelen = fin.tellg();
if(fin.fail()) cerr<<"tellg() fail!\n";
fin.seekg(0, ios::beg);
if(fin.fail()) cerr<<"seekg() fail!\n";
// Copy the file data.
bytesRemaining = filelen;
while (bytesRemaining > 0)
{
bytes = bytesRemaining > BUFSIZE ? BUFSIZE : bytesRemaining;
buffer[bytes] = '\0';
fin.read(buffer,bytes);
if(fin.fail())
{
cerr<<"read() errror\n";
exit(1);
}
send(Sockfd,buffer,sizeof buffer,0);
recv(Sockfd,buffer,strlen(buffer),0);
bytesRemaining -= bytes;
}
fin.close();
}
和服务器
int retval;
char EchoBuffer[RCVBUFSIZE]; // Buffer for echo string
int RecvMsgSize; // Size of received message
std::ofstream fout;
fout.open("test.txt",std::ios::ate);
// Send received string and receive again until end of transmission
while(RecvMsgSize > 0)
{ // zero indicates end of transmission
// Echo message back to client
if(send(ClntSocket, EchoBuffer, RecvMsgSize, 0) != RecvMsgSize){
perror("send() failed"); exit(1);
}
// See if there is more data to receive
if((RecvMsgSize = recv(ClntSocket, EchoBuffer, RCVBUFSIZE-1, 0)) < 0){
perror("recv() failed"); exit(1);
}
EchoBuffer[RecvMsgSize] = '\0';
fout << EchoBuffer << endl; //If I don't have this endl, it won't work at all
}
fout.close();
close(ClntSocket); // Close client socket
}
您应该写fout.flush();
后fout << EchoBuffer;
。
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