Change Desktop Wallpaper

amahta

Unfortunately pre-compiled Libs for Qt are not provided with the official release (not yet!) but you can try building from source yourself.
I would suggest installing a lower version of MSVC compiler such as MSVC2013 (Community Edition is free btw) and using pre-compiled libraries if you are not comfortable with building sources yourself, or if you would prefer official builds.

QT-static-prgm

Ok i'll try to build the source. I did it a while ago with MinGW for static linking. So i hope it will be similar to this.
What's the difference between qt-everywhere-opensource-src-5.5.1 http://download.qt.io/archive/qt/5.5/5.5.1/single/ and qt5-opensource-src-5.5.1 http://download.qt.io/archive/qt/5.5/5.5.1/submodules/

Why should i use a lower version of MSVC?? I recently updated from VS 2013 Ultimate to VS 2015. So i'd prefer the newer one. But if this is a problem I can install VS2013 again.

amahta

@QT-static-prgm
Single is like an All-In-One package of modules but submodules version offers all modules separately.
Most probably you need Single version.
I'll suggest taking a look at this page and also this post

You need to use the lower version if you want the official build. If not, you can build yourself.
Good luck

QT-static-prgm

Thank you very much. Your tutorial is great. But i have some problems again:

+ cd qtbase
+ C:\Qt\5.5.1\qt-everywhere-opensource-src-5.5.1\qtbase\configure.bat -top-level -static -debug-and-release -prefix "C:\Qt\5.5.1\msvc2015_static" -platform win32-msvc2015 -qt-zlib -qt-pcre -qt-libpng -qt-libjpeg -qt-freetype -opengl desktop -qt-sql-sqlite -qt-sql-odbc -no-openssl -opensource -confirm-license -make libs -nomake tools -nomake examples -nomake tests

This is the Qt for Windows Open Source Edition.

You have already accepted the terms of the license.

Creating qmake...
execute: File or path is not found (nmake)
execute: File or path is not found (nmake)
Cleaning qmake failed, return code -1

btw what are all these options good for??

did i take the wrong cmd?? I used "MSBuild Befehlszeile für VS2015". There some more in my Start->All Programms->Visual Studio list:
Developer-Eingabeaufforderung für VS2015,
VS2015 x64 ARM Cross Tools-Eingabeaufforderung,
VS2015 x64 Native Tools-Eingabeaufforderung,
VS2015 x64 x86 Cross Tools-Eingabeaufforderung,
VS2015 x86 ARM Cross Tools-Eingabeaufforderung,
VS2015 x86 Native Tools-Eingabeaufforderung,
VS2015 x86 x64 Cross Tools-Eingabeaufforderung

Which one is the right one??

amahta

You should have "Developer Command Prompt for VS2015"
You are using German version so "Developer-Eingabeaufforderung für VS2015" is correct!

QT-static-prgm

It works :D Thank you very much.
ähm ok i just wanted to press send and checked my cmd output and it "finished". But it says:

jom: C:\Qt\5.5.1\qt-everywhere-opensource-src-5.5.1\qtdeclarative\src\qml\Makefile.Debug [.generated\debug\RegExpJitTables.h] Error 1
jom: C:\Qt\5.5.1\qt-everywhere-opensource-src-5.5.1\qtdeclarative\src\qml\Makefile [debug-all] Error 2
jom: C:\Qt\5.5.1\qt-everywhere-opensource-src-5.5.1\qtdeclarative\src\Makefile [sub-qml-make_first-ordered] Error 2
jom: C:\Qt\5.5.1\qt-everywhere-opensource-src-5.5.1\qtdeclarative\Makefile [sub-src-make_first] Error 2
jom: C:\Qt\5.5.1\qt-everywhere-opensource-src-5.5.1\Makefile [module-qtdeclarative-make_first] Error 2

amahta

@QT-static-prgm check your build folder. Most probably you already have most of the libraries built. Continue with "jom install" command.
But you can also check for dependencies and/or remove the module causing the problem, in this case it is qtdeclarative, and then rebuild.

QT-static-prgm

-nomake qtdeclarative doesn't work :/

cd qtbase
C:\Qt\5.5.1\qt-everywhere-opensource-src-5.5.1\qtbase\configure.bat -top-level -static -debug-and-release -prefix "C:\Qt\5.5.1\msvc2015_static" -platform win32-msvc2015 -c++11 -qt-zlib -qt-pcre -qt-libpng -qt-libjpeg -qt-freetype -opengl desktop -qt-sql-sqlite -qt-sql-odbc -no-openssl -opensource -confirm-license -make libs -nomake tools -nomake examples -nomake tests -nomake qtdeclarative
Unknown part qtdeclarative passed to -nomake.

amahta

@QT-static-prgm It won't. You have to carefully read configure options. I suggest taking a look at this old post of mine about configure options. If I am not mistaken, you need to use "skip" instead of "nomake"

QT-static-prgm

And again, thank you so much. What is qtdeclarative good for??

amahta

@QT-static-prgm it is related to QML. I usually can live without it :)

QT-static-prgm

Next error:

Error: dependent 'C:\Qt\5.5.1\qt-everywhere-opensource-src-5.5.1\qtdeclarative\lib\Qt5Qmld.lib' does not exist.
jom: C:\Qt\5.5.1\qt-everywhere-opensource-src-5.5.1\qtwebchannel\src\webchannel\Makefile [debug-all] Error 2
jom: C:\Qt\5.5.1\qt-everywhere-opensource-src-5.5.1\qtwebchannel\src\Makefile [sub-webchannel-make_first] Error 2
jom: C:\Qt\5.5.1\qt-everywhere-opensource-src-5.5.1\qtwebchannel\Makefile [sub-src-make_first] Error 2
jom: C:\Qt\5.5.1\qt-everywhere-opensource-src-5.5.1\Makefile [module-qtwebchannel-make_first] Error 2

I think it's a kind of Windows 10 problem: https://forum.qt.io/topic/58056/compilation-failure-with-vs2015/3

mrjj

@QT-static-prgm
HI just a side note:
I used this on Win 7 to change wallpaper.
(with mingw compiler)
Never tested on window 10, so might not work.

#include "mainwindow.h"
#include <QApplication>
#include <qDebug>

#include <Windows.h>
int setwallpaper (QString filePath ) {
  bool ret = SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, (PVOID)filePath.utf16(), SPIF_SENDWININICHANGE | SPIF_UPDATEINIFILE);
  return ret;
}

int main(int argc, char* argv[]) {
  QApplication a(argc, argv);
  MainWindow w;
  w.show();
  setwallpaper("c:/test.jpg"); // adjust
  return a.exec();
}

QT-static-prgm

Your code looks easy. I'll try it. But for now my program shown above is working with the VS compiler.

Thank you all :D

Ok next i'll try to manipulate the image to show the date and clock in the lower right corner. (my university killed the windows clock. That's why i need this ;))

mrjj

@QT-static-prgm
hehe so you switch compiler and
compiled all of Qt so you can change
the wallpaper each minute and that way
get a clock ???
:))
That is the spirit if I ever saw one :))

but are you sure they allow to change the wallpaper?

QT-static-prgm

@mrjj
That's the aim :D

btw your code works fine as well. It is only faster then the other one. This:

#include "mainwindow.h"
#include <QApplication>
#include <QDebug>
#include "shobjidl.h"
#include <Windows.h>


int setwallpaper (QString filePath ) {
  bool ret = SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, (PVOID)filePath.utf16(), SPIF_SENDWININICHANGE | SPIF_UPDATEINIFILE);
  return ret;
}


int main(int argc, char *argv[])
{
	HRESULT hr = CoInitialize(NULL);
	IDesktopWallpaper *pDesktopWallpaper = NULL;
	hr = CoCreateInstance(__uuidof(DesktopWallpaper), NULL, CLSCTX_ALL, IID_PPV_ARGS(&pDesktopWallpaper));
	if (FAILED(hr))
	{
		qDebug() << "error";
	}
	else
	{
		pDesktopWallpaper->SetWallpaper(NULL, QString("D:\\Bilder\\BMW\\3er nachher.jpg").toStdWString().c_str());
	}

	qDebug() << setwallpaper("D:\\Bilder\\BMW\\f22-wallpaper-1920x1600-16.jpg");

	return 0;
}

causes in first shown the f22-wallpaper-1920x1600-16.jpg image and then 3er nachher. So maybe your code is better and that way there was no need to compile qt for vs.

But ok now i understand building qt a bit better XD

mrjj

Ok. good to know,

Next its to create a timer object
http://www.bogotobogo.com/Qt/Qt5_QTimer.php
and then ( code not syntax checked)

// draw time on image
QPixmap pix("D:\\Bilder\\BMW\\3er nachher.jpg");
QPainter paint(pix);
QTime time = QTime::currentTime();
QString text = time.toString("hh:mm");
paint.drawText(pix.width()-100,pix.height()-20,text);

and off u go :)

QT-static-prgm

@mrjj You saved my time. Thanks for the commands. I hope there are not too much questions tomorrow than i find some time to implement it in the cip-pool :D

mrjj

@QT-static-prgm
Well its a good cause :)
Repel against the clock-less desktops!!
I think it would be the easiest to move all code to the timer object.
and let it draw on image then set it.
over and over :)

amahta

I'm glad the problem's solved. What @mrjj just mentioned is definitely much easier. My way was more like an example of using interfaces in Qt. They are of course more complicated but Windows API is changing so I guess you won't lose anything by seeing an interface example!
Good luck both