fprintf不会编写整个过程

Question

I'm writing a code which takes 1024 packets from another program, prints them to the console and writes them into a txt file. Now the packets are transmitted just fine and the receiver prints them to the console successfully, all 1024 packets. However when I open the txt file, I see that it stopped writing in the middle of 972th packet. My output on the txt is like this:

Binary Buffer1: 01111000110 :966

Binary Buffer2: 01111000111 :967

XOR:            00000000001


Binary Buffer1: 01111001000 :968

Binary Buffer2: 01111001001 :969

XOR:            00000000001


Binary Buffer1: 01111001010 :970

Binary Buffer2: 01111001011 :971

XOR:            00000000001


Binary Buffer1: 01111001100 :972

Bin

It just stops after that Bin. My code part for fprintf is like this:

if(message_to_send[0]=='\0'&&message_to_send2[0]=='\0')

    {

        n = recvfrom(sockfd,message_to_send,5,0,(struct sockaddr *)&cliaddr,&len);

    sayi1=atoi(message_to_send);

    printf("Binary Buffer1: %s :%d\n",byte_to_binary(sayi1),sayi1);

    fprintf(f, "Binary Buffer1: %s :%d\n", byte_to_binary(sayi1),sayi1);

    sendto(sockfd,message_to_send,n,0,(struct sockaddr *)&cliaddr,sizeof(cliaddr));

    }


else if (message_to_send[0]!='\0'&&message_to_send2[0]=='\0')

    {

    n2 = recvfrom(sockfd,message_to_send2,5,0,(struct sockaddr *)&cliaddr,&len);

    sayi2=atoi(message_to_send2);

    printf("Binary Buffer2: %s :%d\n",byte_to_binary(sayi2),sayi2);

    fprintf(f, "Binary Buffer2: %s :%d\n", byte_to_binary(sayi2),sayi2);



    sendto(sockfd,message_to_send2,n2,0,(struct sockaddr *)&cliaddr,sizeof(cliaddr));

    }

This code block is in a loop so it prints all 1024 packets. I have no idea what might be the cause. There is no limit while writing into a text file right?

Thank you for your help.

Answer 1

Do you fclose the file at the end of the program and is this fclose really reached? Otherwise buffered file IO might not be written to the file.