[Qgis-developer] Open a project file programmatically

[Nathan Woodrow]

http://qgis.org/api/classQgisInterface.html#ac23b3947fa382bf08a5f0164bac8b053

- nathan

On Tue, 17 Mar 2015 7:16 pm Olivier Dalang <olivier.dalang at gmail.com> wrote:

> Hi !
>
> I'm trying to load a project file using python in a plugin, but am
> encountering some problems.
>
> I simply want to have exactly the same behavior as if the user was
> choosing "open" from the project menu, and selecting one particular file.
>
> The C++ QgisApp class has an void openProject(const QString &fileName)
> method which I suspect to do what I want, but if I'm not mistaken, there's
> no access to QgisApp through python.
> The python QgisInterface class has no such method. It only has a reference
> to the QAction triggering the open file dialog, but that's not helping.
>
> So I'm using these lines :
>
>         QgsProject.instance().clear()
>         QgsProject.instance().setFileName('C:\mypath\myfile.qgs')
>         QgsProject.instance().read()
>
> It seems to work more or less.
>
> But the behavior is not exactly the same :
>
> - postgres layers for which I have a stored user/password in the browser
> (not in the project file) are simply ignored (there's not even an
> user/password prompt, nor the handle bad layers dialog).
> - there's no save prompt if the current project was modified
> - I seem to have some crashes every now and then
>
> Is there a way to simply open a file using python given it's path ? Am I
> just missing it ?
>
> Thanks for your help !!
>
> Olivier
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