CODEWITHSUNDEEP
c++qt
0xAX
0xAX

Reputation: 21817

qt write to end file

I need to write some text at the end of txt file. But i can only rewrite all file. How can i add text to the end of file?

Thank you.

Upvotes: 5

Views: 7027

Answers (3)

Mahdi Khalili
Mahdi Khalili

Reputation: 1198

i did this after reading @Let_Me_Be 's answer 

QString log;
for(int i=0;i<argc;i++){
    log+= argv[i];
    log+="\n";
}

QFile logFile("log.ini");
if(logFile.open(QIODevice::Append|QIODevice::Text)){
    QTextStream outLog(&logFile);
    outLog<<log;
}
logFile.close();

Upvotes: 0

dirbacke
dirbacke

Reputation: 3021

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main(void)
{
    FILE *fp;
    size_t count;
    const char *str = "hello\n";



fp = fopen("yourFile.txt", "a");
if(fp == NULL) {
    perror("failed to open yourFile.txt");
    return EXIT_FAILURE;
}
count = fwrite(str, 1, strlen(str), fp);
printf("Wrote %u bytes. fclose(fp) %s.\n", count, fclose(fp) == 0 ? "succeeded" : "failed");return EXIT_SUCCESS;}
Just use the append "a" flag!

Upvotes: 1

Šimon T&#243;th
Šimon T&#243;th

Reputation: 36433

Are you sure you are opening the file in the append mode? QIODevice::Append

Upvotes: 16

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