Decode base64 into PDF file

I have a PDF file which has been encoded to base64. Now I want to convert these base64 script and write to a file to make a PDF file, I have try as following code:

Code:

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QByteArray data = QByteArray::fromBase64(ui->txtData->toPlainText().toAscii());
    QFile file("output.pdf");
    file.open(QIODevice::WriteOnly | QIODevice::Text);
    QTextStream out(&file);
    out << data;
    file.close();

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It can create the PDF file but it can not be read, the Foxit Reader say that "format error". I check the data has been decoded and I found that some special character become "?". How could I get all the character out? Could anyone can give me a solution?

QTextStream is for streaming textual data. PDF is binary data so it is not suited for QTextStream. Use QFile::write() instead.

Quote:

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Originally Posted by wysota

QTextStream is for streaming textual data. PDF is binary data so it is not suited for QTextStream. Use QFile::write() instead.

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I use QFile::write() but it still error and I try QDataStream instead, it works fine now. Thank you!

... then you are doing it wrong. If QDataStream::writeRawData() works then QIODevice::write() must work: the former being a thin wrapper over the latter.