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    Qt World Summit: Early-Bird Tickets

    Change Desktop Wallpaper

    General and Desktop
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    • QT-static-prgm
      QT-static-prgm last edited by

      Hi,

      i'm looking for a way to change the Background of the desktop via prgm.
      I read something about
      SystemParametersInfo but this doesn't work for me beacuse there is a problem with the path. And if i take an example code where you drag the img on the exe it works, but the screen becomes only black.

      Also i read something about IActiveDesktop, but i all the headers needed don't work for me.

      So what is the easier way? ActiveDesktop or SystemParametersInfo?? And how can i do it??

      The idea is simple i have a image called myWallaper, or what ever, and put it in the same directory with the exe. and than the .exe will be startet and i get the new Wallpaper.

      Thank you for your help

      1 Reply Last reply Reply Quote 0
      • QT-static-prgm
        QT-static-prgm last edited by

        Ok i got a prgm working for setting wallpaper

        @#include <iostream>
        #include <windows.h>
        #include <QString>

        using namespace std;

        int main()
        {
        QString filepath = "C:\Path\to\Image\Image.jpg";
        char path[150];
        strcpy(path, filepath.toStdString().c_str());
        char *pathp;
        pathp = path;

        cout << path;

        int result;
        result = SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, pathp, SPIF_UPDATEINIFILE);

        if (result)
        {
        cout << "Wallpaper set";
        }
        else
        {
        cout << "Wallpaper not set";
        cout << "SPI returned" << result;
        }

        return 0;
        }@

        I also read that there's a problem with jpg and that only bmp works, but also if i take a bmp it doesn't work. maybe someone has an idea.

        a yes the problem is that the screen just becomes black

        1 Reply Last reply Reply Quote 0
        • A
          amahta last edited by

          You need to use Windows API interfaces (IDesktopWallpaper to be precise) to do this in newer versions of Windows such as 8 and 10.
          Checkout this post for more info.

          Thou shalt programme
          http://www.amin-ahmadi.com

          1 Reply Last reply Reply Quote 0
          • QT-static-prgm
            QT-static-prgm last edited by

            I tried the code, but i get some errors. I hope you understand them. I fixed some of them by using NULL instead of nullptr.

            #include "shobjidl.h"
            #include <QDebug>
            
            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("C:\\Users\\Amin\\Desktop\\test.jpg").toStdWString().c_str());
            	}
            
            	return 0;
            }
            
            QT += core
            QT -= gui
            
            TARGET = WallpaperChanger
            #CONFIG += console
            CONFIG -= app_bundle
            LIBS += -lOle32
            
            TEMPLATE = app
            
            SOURCES += main.cpp
            
            
            
            • D:\workspaces\Qt_default\WallpaperChanger\main.cpp:17: Fehler: invalid use of incomplete type 'IDesktopWallpaper {aka struct IDesktopWallpaper}'
              pDesktopWallpaper->SetWallpaper(NULL, QString("C:\Users\Amin\Desktop\test.jpg").toStdWString().c_str());
              ^

            • C:\Qt\Qt5.5.1\Tools\mingw492_32\i686-w64-mingw32\include\shobjidl.h:987: Fehler: forward declaration of 'IDesktopWallpaper {aka struct IDesktopWallpaper}'
              typedef interface IDesktopWallpaper IDesktopWallpaper;
              ^

            • C:\Qt\Qt5.5.1\Tools\mingw492_32\i686-w64-mingw32\include\combaseapi.h:79: Fehler: invalid static_cast from type 'IDesktopWallpaper*' to type 'IUnknown*'
              static_cast<IUnknown *> (*pp);
              ^

            1 Reply Last reply Reply Quote 0
            • A
              amahta last edited by

              First of all, please try the same thing with a Widgets application. And create it by selecting new project, the Widgets Application. Do NOT use console project to try it! (Your project does not seem to be even Console anyway!)
              Next, you seem to be using MingW compiler, not sure but you may be facing the problem because of that. The interface mentioned here belongs to recent SDKs of Windows and therefore it might not work correctly (link correctly) with a MingW compiler.
              I would suggest using a recent MSVC compiler.

              Thou shalt programme
              http://www.amin-ahmadi.com

              1 Reply Last reply Reply Quote 0
              • QT-static-prgm
                QT-static-prgm last edited by

                OK, i changed it to widgets application. And yes i'm using MinGW.
                I tried to config MSVC for my Qt Creator, but i wasn't successfull:

                • :-1: Warnung: LNK4044: Nicht erkannte Option /lshell32; wird ignoriert.

                • :-1: Warnung: LNK4044: Nicht erkannte Option /LC:\Qt\Qt5.5.1\5.5\mingw492_32\lib; wird ignoriert.

                • :-1: Warnung: LNK4044: Nicht erkannte Option /lQt5Cored; wird ignoriert.

                • :-1: Fehler: LNK1104: Datei "C:\Qt\Qt5.5.1\5.5\mingw492_32\lib\qtmaind.lib" kann nicht geöffnet werden.

                I'm sure i need the libs for msvc, but i couldn't find them. Are there the libs pre compiled? Or do i need to take the qt-everywhere-opensource-src-5.5.1.zip and build the source with my compiler on my own??
                (I have Visual Studio Enterprise 2015 installed)

                1 Reply Last reply Reply Quote 0
                • A
                  amahta last edited by

                  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.

                  Thou shalt programme
                  http://www.amin-ahmadi.com

                  1 Reply Last reply Reply Quote 0
                  • QT-static-prgm
                    QT-static-prgm last edited by

                    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.

                    A 1 Reply Last reply Reply Quote 0
                    • A
                      amahta @QT-static-prgm last edited by

                      @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

                      Thou shalt programme
                      http://www.amin-ahmadi.com

                      1 Reply Last reply Reply Quote 1
                      • QT-static-prgm
                        QT-static-prgm last edited by

                        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??

                        1 Reply Last reply Reply Quote 0
                        • A
                          amahta last edited by

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

                          Thou shalt programme
                          http://www.amin-ahmadi.com

                          1 Reply Last reply Reply Quote 0
                          • QT-static-prgm
                            QT-static-prgm last edited by

                            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

                            A 1 Reply Last reply Reply Quote 0
                            • A
                              amahta @QT-static-prgm last edited by

                              @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.

                              Thou shalt programme
                              http://www.amin-ahmadi.com

                              1 Reply Last reply Reply Quote 0
                              • QT-static-prgm
                                QT-static-prgm last edited by

                                -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.
                                A 1 Reply Last reply Reply Quote 0
                                • A
                                  amahta @QT-static-prgm last edited by

                                  @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"

                                  Thou shalt programme
                                  http://www.amin-ahmadi.com

                                  1 Reply Last reply Reply Quote 0
                                  • QT-static-prgm
                                    QT-static-prgm last edited by

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

                                    A 1 Reply Last reply Reply Quote 0
                                    • A
                                      amahta @QT-static-prgm last edited by

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

                                      Thou shalt programme
                                      http://www.amin-ahmadi.com

                                      1 Reply Last reply Reply Quote 0
                                      • QT-static-prgm
                                        QT-static-prgm last edited by

                                        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 1 Reply Last reply Reply Quote 0
                                        • mrjj
                                          mrjj Lifetime Qt Champion @QT-static-prgm last edited by

                                          @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();
                                          }
                                          
                                          
                                          1 Reply Last reply Reply Quote 0
                                          • QT-static-prgm
                                            QT-static-prgm last edited by

                                            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 1 Reply Last reply Reply Quote 0
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