read multiple image from QFileDialog

xena

Hi all, I am trying to read multiple image and do some image processing with QFileDialog but receive the following error.

error: C2664: 'cv::Mat cv::imread(const cv::String &,int)' : cannot convert argument 1 from 'std::list<T,std::allocator<_Ty>>' to 'const cv::String &'
with [T=QString

if anyone knows what the error or solution is please advice :)

    cv::Mat imgOriginal;            // input image
    QStringList strFileName = QFileDialog::getOpenFileNames();       // bring up open file dialog



    if(!strFileName.isEmpty())
    {

        for (int i =0;i<strFileName.count();i++)
        {

            ui->labelChosenFile->setText(strFileName.at(i));
            imgOriginal = cv::imread(strFileName.toStdList());        // read image to imgOriginal
        }
    }

Gerd

Hi,
instead of

imgOriginal = cv::imread(strFileName.toStdList());        // read image to imgOriginal

use

imgOriginalginal = cv::imread(strFileName.at(i).toStdString());        // read image to imgOriginal

jsulm

Hi!

You're program logic looks wrong.

if(!strFileName.isEmpty())
{
    for (int i =0;i<strFileName.count();i++)
    {
         ui->labelChosenFile->setText(strFileName.at(i));
         imgOriginal = cv::imread(strFileName.at(i).toStdString());        // read image to imgOriginal
    }
}

micland

To add an explanationto the suggested fixes: QList::toStdList() converts the QStringList (= QList<QString>) to an std::list<QString>. But I guess you need a std::list<std::string>. That's why you have to iterate over the list and call QString::toStdString() for each list entry...

xena

Thank you for the suggestion and explanation it is very helpful :D