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Editorial Team
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Asked: 2026-05-19T05:52:57+00:00

Behold the code: QImage *qi = new QImage(fullCharArray, imwidth, imheight, QImage::Format_Indexed8); ui->viewLabel->setPixmap(QPixmap::fromImage(qi,Qt::AutoColor)); Why does

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Behold the code:

QImage *qi = new QImage(fullCharArray, imwidth, imheight, QImage::Format_Indexed8);
ui->viewLabel->setPixmap(QPixmap::fromImage(qi,Qt::AutoColor));

Why does this give me an error? What is it trying to get me to change the qi argument to in the call to fromImage? I am relatively new to C++ and it seems like I am setting this up correctly. It works if I change the line to 

QImage *qi = new QImage(fullCharArray, imwidth, imheight, QImage::Format_Indexed8);
    ui->viewLabel->setPixmap(QPixmap::fromImage(qi[0],Qt::AutoColor));

But is that the correct way to do this?

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1 Answer

  1. Editorial Team

    It’s because QPixmap::fromImage expects a reference to an image, not a pointer to one.

    However, change your qi[0] to *qi, that makes the intention cleaner. (or just refrain from using a pointer and start with QImage qi(fullCharArray ...).

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