[Solved] Prepend long to QByteArray

McLion

Hi

I have a define that carries a long that I want to prepend to a QByteArray. How can I easily do this?

@#define SAMPLE 0x72454578
QByteArray Data->prepend(SAMPLE);
@

does not work (obviously!?).
Data should get {72,45,45,78 ......}
How can this be done easily?

McLion

Forgot to show how I currently do it:
@
uTemp.l = SAMPLE;
Data->prepend(uTemp.c[0]);
Data->prepend(uTemp.c[1]);
Data->prepend(uTemp.c[2]);
Data->prepend(uTemp.c[3]);@

prady_80

Would
QByteArray Data;
Data.prepend(QByteArray::number(SAMPLE));

help?

vidar

@ #define SAMPLE 0x72454578
QByteArray Data;

Data.prepend( (char) (SAMPLE>>0*8) );
Data.prepend( (char) (SAMPLE>>1*8) );
Data.prepend( (char) (SAMPLE>>2*8) );
Data.prepend( (char) (SAMPLE>>3*8) );@

should do the job ... ?

McLion

@prady_80
This does not work. QByteArray::number serves a different use.

@vidar
This would work, but is not really shorter or a "smaller" way.

Thank you guys for trying to help.
I think I leave it as it is.

vidar

This would also work, if you think that's shorter:

@ QByteArray Data;
const char sample[4] = { 0x72, 0x45, 0x45, 0x78 };

 Data.prepend( sample, 4 );@