[Qgis-developer] Open a *.qgs project file in API, why maps do not show?

[Tendfly niu]

Hi all, 
I'm using QGIS-2.4.0 API. I saved a test.qgs file in QGIS Desktop, in this
project, there is one layer in it. 

Then I open the test.qgs project file in QGIS API to developing, but it is
not showed in APP. 

Why is that? 
The code I'm using to open the project is: 
    QString myProjectPath = "E:\\QGIS\\Pro\\test.qgs"; 
    Qgsproject::instance()->setFileName(myProjectPath); 
    bool isRead = QgsProject::instance()->read(); 

In Debug mode, isRead equals TRUE. 

Any advice would be appreciated!

 

Regards,

 

Bob

 

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