copy unsigned char array into QByteArray ..... problems
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@J.Hilk hi,
passed buf[] as you told, as a parameter to QSerialPort(), but it gives same error.
The code is:for(i=0;i<20;i++){ wbuf[i]=i; } const qint64 bytesWritten = serPort->write(wbuf));the error is:
invalid conversion from "unsigned char*" to "const char*"can you point to examples or doc pages, if possible.
Thanks.
@o6a6r9v1p Please read what @raven-worx wrote (hint: casting)
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@o6a6r9v1p Please read what @raven-worx wrote (hint: casting)
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@jsulm
hi,
can we do it the way it is done C?
or is it different in C++?I am not good in C++.
Thanks.
const qint64 bytesWritten = serPort->write(reinterpret_cast<char*>(wbuf))); -
@jsulm
hi,
can we do it the way it is done C?
or is it different in C++?I am not good in C++.
Thanks.
@o6a6r9v1p
take a look herehttp://www.cplusplus.com/doc/tutorial/typecasting/
you can use c-style casting, but you're encuraged to use the cpp variants
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const qint64 bytesWritten = serPort->write(reinterpret_cast<char*>(wbuf))); -
@jsulm
hi,
Thanks for the word. this line was used, think i am wrong some where.const qint64 bytesWritten = serPort->write(const QByteArray ((unsigned char*) wbuf));where did i miss?
Thanks,
@o6a6r9v1p Why do you create a byte array? @J-Hilk already said here that this is not needed.
What is wrong in your code: remove the const before QByteArray. You should learn more about C++. -
@o6a6r9v1p Why do you create a byte array? @J-Hilk already said here that this is not needed.
What is wrong in your code: remove the const before QByteArray. You should learn more about C++. -
@o6a6r9v1p Again: there is NO need for QByteArray.
This line should work as well, did you try?const qint64 bytesWritten = serPort->write(reinterpret_cast<char*>(wbuf))); -
@o6a6r9v1p Why do you create a byte array? @J-Hilk already said here that this is not needed.
What is wrong in your code: remove the const before QByteArray. You should learn more about C++. -
@jsulm
removed const as told.
still i am getting:invaild conversion from unsigned char* to const char* error.i know c programming, but not good in c++,
thanks,
@o6a6r9v1p You should read more carefully - I already showed you what you need to do.
- Why do you want to use QByteArray? It is not needed. QByteArray does not care about any order - it is the order you give it.
- You need to cast unsigned char* to char*. See my previous posts to see how, I don't want to write it again and again.
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@o6a6r9v1p Again: there is NO need for QByteArray.
This line should work as well, did you try?const qint64 bytesWritten = serPort->write(reinterpret_cast<char*>(wbuf)));
