qt - Error in using created custom widget in designer -

-

i having problem on using created custom widget. have created custom widget produces .dll file. placed .dll file under bin/designer. recognized in designer. used , placed on ui. when tried build it, error occurred.

debug\moc_scribblearea.cpp(44) : warning c4273: 'staticmetaobject' : inconsistent dll linkage d:\project\qt\workspace\sample-build-desktop\debug../../oep/scribblearea.h(53) : see previous definition of 'public: static qmetaobject const scribblearea::staticmetaobject'

debug\moc_scribblearea.cpp(44) : error c2491: 'scribblearea::staticmetaobject' : definition of dllimport static data member not allowed

debug\moc_scribblearea.cpp(54) : warning c4273: 'scribblearea::metaobject' : inconsistent dll linkage d:\project\qt\workspace\sample-build-desktop\debug../../sample/scribblearea.h(53) : see previous definition of 'metaobject'

debug\moc_scribblearea.cpp(59) : warning c4273: 'scribblearea::qt_metacast' : inconsistent dll linkage d:\project\qt\workspace\sample-build-desktop\debug../../sample/scribblearea.h(53) : see previous definition of 'qt_metacast'

debug\moc_scribblearea.cpp(67) : warning c4273: 'scribblearea::qt_metacall' : inconsistent dll linkage d:\project\qt\workspace\sample-build-desktop\debug../../oep/scribblearea.h(53) : see previous definition of 'qt_metacall'

how can use created custom widget correctly? there document/reference describes how use custom widget, copying .dll bin/designer folder upto building project?

i have never created custom widget stored in .dll, therefore can't on primary question, have workaround offer:

if custom widget relatively simple (it not have complex properties explicitly require form-editor) can create placeholder of kind (e.g. superclass of widget) in container-form, able set basic properties position, geometry, size & size-policy , replace placeholder custom widget using simple code in container-form constructor.

let's have following:

a. custom widget guiinpimageview inheriting qgraphicsview: guiinpimageview::guiinpimageview(qwidget *parent):qgraphicsview(parent)

b. mainwindowbase.ui (class mainwindow) @ want put instance of guiinpimageview

this workaround solution step-by-step:

  1. put .cpp source & header file guiinpimageview directly in project (not in dll)

  2. define following private member in mainwindow class header: guiinpimageview *inpimageview;

  3. open mainwindowvase.ui in form-editor , put qgraphicsview widget @ position wanted put custom guiinpimageview widget. let's have created vertical layout named inpimageviewvertlayout containing qgraphicsview named inpimageviewph (ph = placeholder). can set -if wish- geometry, min & max size , size policy of inpimageviewph using properties exposed in form-editor of qtcreator.

  4. put following code mainwindow constructor:

// main window constructor
mainwindow::mainwindow(qwidget *parent) : qmainwindow(parent)
{

setupui(this); // setup ui  // replace inpimageviewph custom widget // (inpimageviewph place holder visualize ui in design mode) inpimageview = new guiinpimageview(centralwidget); inpimageview->setgeometry(inpimageviewph->geometry()); inpimageview->setminimumsize(inpimageviewph->minimumsize()); inpimageview->setmaximumsize(inpimageviewph->maximumsize()); inpimageview->setsizepolicy(inpimageviewph->sizepolicy()); inpimageviewvertlayout->addwidget(inpimageview); // remove , hide placeholder, keep custom view inpimageviewvertlayout->removewidget(inpimageviewph); inpimageviewph->hide();  ...

this easiest way have found insert custom widget in form using code (without creating .dll) have graphical-preview , control position & size of widget in form-container.

hope helps...


Comments

Post a Comment

Popular posts from this blog

php - What is the difference between $_SERVER['PATH_INFO'] and $_SERVER['ORIG_PATH_INFO']? -

-
what’s difference between $_server['path_info'] , $_server['orig_path_info'] ? how use them? when run print_r($_server) , path_info , orig_path_info not present in array. why not? how can enable them? i have read php manual on them, still don’t understand them. the path_info variable present if invoke php script this: http://www.example.com/phpinfo.php/hello_there it's /hello_there part after .php script. if don't invoke url that, there won't $_server["path_info"] environment variable. the porig_ prefix uncommon. path_info standard cgi-environment variable, , should never prefixed. did read that? (there issues around php3/php4 if invoked php interpreter via cgi-bin/ - hardly has such setups today.) for reference: http://www.ietf.org/rfc/rfc3875
Read more

fortran - Function return type mismatch -

-
i'm attempting recode old c++ program in fortran make use of lapack (i'm aware c++ have lapack++, i'm having lot of trouble installing it, gave up). i didn't have problems compilation, when had variables declared real . when started coding section of program required lapack, found parameters passed dsyev need double precision . tried change double precision (including changing hard coded numbers double precision counterparts, i.e. 0.0 -> 0.0d0) when try compile, following error of functions , subroutines i've written: error: return type mismatch of function <function> @ (1) (real(4)/real(8)) i'm not sure coming from, in program has been changed double precision. for example, i've declared following: double precision :: alpha(3),d(3),zeta1,zeta2 double precision :: a1(3),a2(3),d1(3),d2(3) double precision :: pi pi = 3.14159265359d0 alpha = (/0.109818d0, 0.405771d0, 2.22766d0/) d = (/0.444635d0, 0.535328d0, 0.154329d0 /) 10 i=1,3 ...
Read more

queue - mq_receive: message too long -

-
i implementing communication between 2 processes using queue. problem when call function mq_receive, error: message long. i have done following: struct mq_attr attr; long size = attr.mq_msgsize; .... // initializing queue "/gateway" int rc = mq_receive(gateway, buffer, size, &prio); if print size value, size=1, while when print same size program (got same mechanism), not long integer ( -1217186280 )... how can solve error?....so while size = 1, believe it's right "message long" why 1? p.s. have tried put : int rc = mq_receive(gateway, buffer, sizeof(buffer), &prio); but no result. it seems need read docs more carefully. when call mq_receive should pass size of destination buffer. this size must greater mq_msgsize attribute of queue . in addition, seems have error in queue attributes initialisation makes proper mq_receive call impossible. here standard message queue session: fill mq_attr struct ( doc ): struct mq_a...
Read more