Very simple output task

[nand]

Hi everyone,

I`m using QT 4.8 on a ubuntu 12.04 machine.

I`m at the end of finishing a little software. But now I cant get through a very simple task. I`m a newbie but I try hard

I just want to following linux command to be executed:

rhash -rH --sha1 --md5 /hashfolder >hashlist

Getting the output from rhash into the hashlist file.

QProcess rhasher;
 
               QString rhash = "rhash";
 
               rhasher.startDetached(QString("rhash -rH --sha1 --md5 /hashfolder/));
 
               QString results = rhasher.readAllStandardOutput();
 
               QFile file("/home/user/hashliste");
 
               file.open(QIODevice::WriteOnly | QIODevice::Text);
 
               QTextStream out(&file);
 
               out << results;
 
               std::cout << "make MD5 und SHA1 hashes" << std::endl;
 
                file.close();
 
                rhasher.waitForFinished(-1);

QProcess rhasher;

               QString rhash = "rhash";

               rhasher.startDetached(QString("rhash -rH --sha1 --md5 /hashfolder/));

               QString results = rhasher.readAllStandardOutput();

               QFile file("/home/user/hashliste");

               file.open(QIODevice::WriteOnly | QIODevice::Text);

               QTextStream out(&file);

               out << results;

               std::cout << "make MD5 und SHA1 hashes" << std::endl;

                file.close();

                rhasher.waitForFinished(-1);

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I`m confusing myself right now. Hope you can help me out. Thanks


greetings Nand

[stampede]

startDetached is a static method, use QProcess::start() and connect to QProcess::readyReadStandardOutput signal to be notified when your process writes to stdout.

[wysota]

And allocate the process object on the heap.

[nand]

ok thank you.

I try the best I can, dont know if I can do this.

[wysota]

Alternatively just use system() or popen() calls which are both blocking.

[nand]

thanks for youre help. But I`m a bloody newbie. I dont know how to do this.

[wysota]

Open a terminal and type in "man popen" or search the internet.

[nand]

FILE *fp;
               int status;
               char path[PATH_MAX];
 
 
               fp = popen("rhash -rH --sha1 --md5 /home/user/ >hashlist", "r");
               if (fp == NULL)
                   /* Handle error */;
 
 
               while (fgets(path, PATH_MAX, fp) != NULL)
                   printf("%s", path);
 
 
               status = pclose(fp);
               if (status == -1) {
 
 
               } else {
 
 
               }

FILE *fp;
               int status;
               char path[PATH_MAX];


               fp = popen("rhash -rH --sha1 --md5 /home/user/ >hashlist", "r");
               if (fp == NULL)
                   /* Handle error */;


               while (fgets(path, PATH_MAX, fp) != NULL)
                   printf("%s", path);


               status = pclose(fp);
               if (status == -1) {
                   

               } else {
                   

               }

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Maybe in a few days I`ve got it....

[anda_skoa]

I would always use QProcess over low level C API.

If you really need it to be blocking use waitForFinished()

Cheers,
_

[wysota]

You are redirecting the output to a file so I don't know what you are expecting to receive on stdout of the process.