How do you check a file exits in another file ?

[QT_QT_QT]

I know you guys will have a lot of doubts regarding to the tile of this topic. Dont worry! I'll give a further explanation of my title. OK, lets start with this scenario, you have a folder A, inside the folder you ll have another three folders, the name of these three folder inside folder A are B,C and D. Now, Folder B and D is a empty folder, which means the folders B and D dont have anything inside the folder, but for folder C ,yes, its not empty, there is a .txt file inside folder C. Right now, i want to check the .txt. file in in which folder , want to check either is in B,C or D. Let me make my question simpler, how do i check which files have the .txt file in folder A?

#include "checkforfiles_form.h"
#include "ui_checkforfiles_form.h"
#include <QFileInfo>
#include <qdebug.h>

using namespace std;

CheckForFiles_Form::CheckForFiles_Form(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::CheckForFiles_Form)
{
    ui->setupUi(this);
}

CheckForFiles_Form::~CheckForFiles_Form()
{
    delete ui;
}

void CheckForFiles_Form::on_pushButton_clicked()
{
    QFileInfo fileInfo;
    fileInfo.setFile("C:\\Users\\USER\\Desktop\\folderA");
    qDebug()<<fileInfo.exists();
}

Above codes only will tell us folder A is really exist in that directory . But this is not i want , i want to search through the Folder A go inside the folder A, and check for which files in folder A containing .txt file?is it B,C or D? Some one here please give me some knowledge ,tips, reference or live example to proceed my task . Thank you

[the_]

@QT_QT_QT

QStringList QDir::entryList(Filters filters = NoFilter, sort = NoSort)

may be what you are looking for.

For example (if i understood your scenario right)

QDir folderA("C:\\Users\\USER\\Desktop\\folderA");
QStringList foldersinA = folderA.entryList(QDir::Dirs);
foreach(QString folder,foldersinA) {
  QDir f(folder);
  QStringList txtlist = f.entryList(QStringList() << "*.txt",QDir::Files);
  //do something with the filenames in txtlist
}

[SGaist]

Hi,

Since you want to check several folder, you can use QDirIterator in addition to what @the_ suggested.

On a side note, since your a using Qt, you should use the unix notation for path (i.e. "C:/Users/USER/Desktop/") that will avoid you headaches if your forget to escape your backslashes.

[QT_QT_QT]

Dear All, this is the solution for this specific problem . Thank you

void CheckForFiles_Form ::recursiveAddDir(QDir d, bool recursive)
{

    d.setSorting(QDir::Name);
    QDir::Filters df = QDir::Files | QDir::NoDotAndDotDot;
    if(recursive) df |= QDir::Dirs;
    QStringList qsl = d.entryList  (df,QDir::Name|QDir::DirsFirst);
    foreach (const QString &entry, qsl){
        QFileInfo fInfo(d,entry);
        if(fInfo.isDir()){
            QDir sd(fInfo.absoluteFilePath());
            recursiveAddDir(sd,true);
        }else{
            if(fInfo.completeSuffix()== "txt")
                qDebug() << fInfo.filePath();
        }
    }
}

void CheckForFiles_Form::on_pushButton_clicked()
{
    QDir r("C:/Users/USER/Desktop/FileA/");
    recursiveAddDir(r, true);
}

[SGaist]

Why not use QDirIterator ? You'd only have to do the file listing and check.