which one is constant,sizeof(int) or sizeof(long)?

[coralbird]

In order to transport a class through Tcp,I have to define constant length's variable in this class,between int and long,which one's size is constant on differernt CPU Type(32 and 64 bit)?
thank you!

[Chicken Blood Machine]

You shouldn't rely on either (all though in most cases you can).

Instead use qint32, qint64, etc.

[coralbird]

but neither qint32 nor qint64 is defined in qt3.3.4.

[Chicken Blood Machine]

but neither qint32 nor qint64 is defined in qt3.3.4.

Q_INT32 and Q_INT64. They're all defined in qglobal.h

[coralbird]

thank Chicken Blood Machine !I have solved this problem as your guide.