How can I read strings from a binary file?
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This is what I have so far:
QFile file; QString str1, str2; file.setFileName(file_name); if (file.open(QIODevice::ReadOnly)) { QDataStream data(&file); data >> str1; data >> str2; } file.close();Will this work or do I have to store the string sizes in the file?
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Hi,
What do you use to write that file ?
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This is what I have so far:
QFile file; QString str1, str2; file.setFileName(file_name); if (file.open(QIODevice::ReadOnly)) { QDataStream data(&file); data >> str1; data >> str2; } file.close();Will this work or do I have to store the string sizes in the file?
@Guerrian Assuming you wrote it with a QDataStream/QFile as binary then no you will not need the lengths of each string.
Edit: as a side note you could have just compiled your example and tested it faster than writing this question. :D
My L-GPL'd C++ Logger github.com/ambershark-mike/sharklog
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@Guerrian Assuming you wrote it with a QDataStream/QFile as binary then no you will not need the lengths of each string.
Edit: as a side note you could have just compiled your example and tested it faster than writing this question. :D
@ambershark Not really, because I would have had two versions of my program each with a load and a save function... too much editing.
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@ambershark Not really, because I would have had two versions of my program each with a load and a save function... too much editing.
@Guerrian Yea but I literally took your code, added it to a
main(), wrote a quick file using QFile as binary, and then read it using your code. Took me < 2 minutes. You didn't have to edit your actual code, you can just create a test app. Even if you were super slow and it took you 20 min to test it, it's still faster than asking a forum. ;)My L-GPL'd C++ Logger github.com/ambershark-mike/sharklog
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@Guerrian Yea but I literally took your code, added it to a
main(), wrote a quick file using QFile as binary, and then read it using your code. Took me < 2 minutes. You didn't have to edit your actual code, you can just create a test app. Even if you were super slow and it took you 20 min to test it, it's still faster than asking a forum. ;) -
@Guerrian Yea but I literally took your code, added it to a
main(), wrote a quick file using QFile as binary, and then read it using your code. Took me < 2 minutes. You didn't have to edit your actual code, you can just create a test app. Even if you were super slow and it took you 20 min to test it, it's still faster than asking a forum. ;)@ambershark I sussed this out, but it took me a lot longer than 20 minutes. I'm new to Qt and my program had a bug which I had to fix before getting this right. It works like you said. Thanks.
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@ambershark I sussed this out, but it took me a lot longer than 20 minutes. I'm new to Qt and my program had a bug which I had to fix before getting this right. It works like you said. Thanks.
@Guerrian Yea sorry I didn't factor learning time or bugs into my times. :) Unfortunately while learning everything takes so much longer. But the experience is what makes the memory in the future.
