Qt5 porting tips/findings

rootshell

Another good one is QString::toASCI() has been depreciated, use QString::toLatin1()

altera_2011

Yep. that change is incredibly sneaky since it doesn't throw any error. Glad it saved you some time

puffosauro

Hi altera_2011.

I'm going to port my Qt 4 application to Qt 5. I have a big Visual Studio (2008) solution with a lot of projects because I have a lot of qt plugins.

My doubt is about the Visual Studio project (and not about the application source code).

I know that with Qt 5 some modules have changed, so I would like to know what's the best procedure to port the Visual Studio project.
I don't know if I can use my old project and change the project settings, or if I must create a new project...

Thanks

altera_2011

puffosauro, I wish I had good advice for you but we use qmake and QtCreator instead of the VS2010 IDE. So in that respect the change to Qt 5 was a non-event as qmake took care of the changes.

How did you create the visual studio projects?

puffosauro

I have used the Visual Studio Addin to create the VS projects and also to add Qt classes etc... so I don't have a .pro file.

altera_2011

I'm sorry I'm not familiar with the VS addin. Maybe someone else can give some suggestions.

koahnig

[quote author="puffosauro" date="1389276361"]I have used the Visual Studio Addin to create the VS projects and also to add Qt classes etc... so I don't have a .pro file.
[/quote]

You can export the project to .pro file from vsaddin. This is part of the Qt menu in msvc. I have done my migration from msvc to Qt creator that way.

Asperamanca

[quote author="JKSH" date="1369361247"]I found another previously-undocumented change:

QPen now has a default width of 1 instead of 0, so it is no longer cosmetic by default.[/quote]

Ouch

puffosauro

[quote author="koahnig" date="1389278461"]
You can export the project to .pro file from vsaddin. This is part of the Qt menu in msvc. I have done my migration from msvc to Qt creator that way. [/quote]

Thanks. But I continue to use Visual Studio with the addin.

I have seen that it is easier than I thought, it's almost "automatic", I have only to add the new modules using the addin and I have to change the names of the libraries in the project settings (eg QtCore4.lib -> Qt5Core.lib)

....

[quote author="JKSH" date="1369361247"]

QPen now has a default width of 1 instead of 0, so it is no longer cosmetic by default.
[/quote]

mamma mia!!!!!! :(

pedromateo

ERROR: 'class QApplication' has no member named 'argc'

FIX for QApplication::argc():

@
s_argc = app->arguments().size();
@

FIX for QApplication::argv():

@
s_argv = new char*[s_argc + 1];
//
for (int i = 0; i < s_argc; i++) {
// current arg
std::string arg =
app->arguments().at(i).toStdString();
// copy arg to char** structure
s_argv[i] = new char[strlen(arg.c_str()) + 1];
memcpy(s_argv[i], arg.c_str(),
strlen(arg.c_str()) + 1); // +1 for '\0'
}
s_argv[s_argc] = ((char)NULL);
@

My two cents :-)

pedromateo

ERROR: 'class QApplication' has no member named 'argc'

FIX for QApplication::argc():

@
s_argc = app->arguments().size();
@

FIX for QApplication::argv():

@
s_argv = new char*[s_argc + 1];
//
for (int i = 0; i < s_argc; i++) {
// current arg
std::string arg =
app->arguments().at(i).toStdString();
// copy arg to char** structure
s_argv[i] = new char[strlen(arg.c_str()) + 1];
memcpy(s_argv[i], arg.c_str(),
strlen(arg.c_str()) + 1); // +1 for '\0'
}
s_argv[s_argc] = ((char)NULL);
@

My two cents :-)

pedromateo

ERROR: 'qWaitForWindowShown' is not a member of 'QTest'

FIX:
@
QWidget* panel;

panel->hide();
panel->show();

#if QT_VERSION >= 0x050000
QTest::qWaitForWindowActive(panel);
#else
QTest::qWaitForWindowShown(panel);
#endif
@

pedromateo