error compile

[mickey]

No you don't. Do you use methods defined there?

yes I use members of mainform from here; But if I put it in implementation compile..
[QUOTE=wysota]
No. You should avoid including to much files in headers, because it slows down the compilation. [QUOTE]
including much headers where? from QTdesigner? in implementation? in declarations? Or at begin of file by hand?

thanks

[wysota]

including much headers where? from QTdesigner? in implementation? in declarations? Or at begin of file by hand?

In header files. Because each file which includes that file will also include all the files including it and each time cpp has to parse them. That's why using precompiled headers results in such a big speed gain Parsing header files takes much time.

[mickey]

Sorry but I have some problems with english also. Do you say me to put #incldue much more In implementation or implemention (from qtDesinger).
And is this an help for speed:

#ifndef MYWIDGET_H
#define MYWIDGET_H
.......

#ifndef MYWIDGET_H
#define MYWIDGET_H
.......

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Thanks