I want to embedded python code in Qt C++ code. I create a console Qt app for test.
My .pro is
SOURCES += main.cpp
LIBS = -lboost_python -lpython27
HEADERS += /usr/include/python2.7
My main.cpp file is
#include <QCoreApplication>
#include <boost/python.hpp>
using namespace boost::python;
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
return a.exec();
}
But I found I can't build this program.
error message is:
/usr/include/boost/python/detail/wrap_python.hpp:50:
Error:pyconfig.h: No such file or directory
I googled this problem, but havn't got answer.
How to configure Qt I want embedded Python code in My Qt C++ program?
it's INCLUDEPATH, not HEADERS in .pro file.
You must install python developer package at first.
In Ubuntu you can use apt-get as the following:
apt-get install python2.7-dev
Related
I have problems loading the built-in plugins for iconengines for a deployed application. Below is a minimal program to show the problem. It is not exactly the same, because Qt scans the plugin directories at start and registers it according to the file suffix, but I hope when I can get the minimal program to run, then the automatic scanning works, too.
main.cpp:
#include <QCoreApplication>
#include <QPluginLoader>
#include <QDebug>
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
QPluginLoader loader("C:/Qt/5.15.1/msvc2019_64/plugins/iconengines/qsvgicon.dll");
if (loader.load()) {
qDebug() << "load ok";
} else {
qDebug() << "load failed";
}
return a.exec();
}
and PluginTest.pro:
QT -= gui
CONFIG += c++11 console
CONFIG -= app_bundle
SOURCES += main.cpp
When I start it from the Qt Creator IDE, version 4.13.1, with Visual Studio 2019, 64 bit compiled, it prints "load ok". Now I do this from a "x64 Native Tools Command Prompt for VS 2019" command prompt in the project directory:
set PATH=%PATH%;C:\Qt\5.15.1\msvc2019_64\bin
mkdir deploy
copy release\PluginTest.exe deploy
windeployqt --release release\PluginTest.exe --plugindir deploy\QtPlugins
When I start PluginText.exe from the command prompt in the deploy directory, I get the output "load failed".
Additional information: when I set set qt_debug_plugins=1 and start the real application, I see these errors:
QFactoryLoader::QFactoryLoader() checking directory path "C:/projects/deploy/QtPlugins/iconengines" ...
QFactoryLoader::QFactoryLoader() looking at "C:/projects/deploy/QtPlugins/iconengines/qsvgicon.dll"
"Failed to extract plugin meta data from 'C:/projects/deploy/QtPlugins/iconengines/qsvgicon.dll'"
not a plugin
The qsvgicon.dll file is identical to "c:\Qt\5.15.1\msvc2019_64\plugins\iconengines\qsvgicon.dll".
I found the problem. It used some other Qt DLLs from the path when starting the application. This fixed it:
xcopy /y c:\Qt\5.15.1\msvc2019_64\bin\*.dll deploy
On Windows 7 I installed qt creator and now I am trying to connect to the oracle database. I installed oracle client and plsql/developer and everything works fine. In qt creator I have error:
QsqlDatabase: QOCI driver not loaded
This qt documentation does not work for me. Is it clear tutorial how to do it on different platforms and situations?
Ok. I found solution.
Documentation says
set INCLUDE=%INCLUDE%;c:\oracle\oci\include
set LIB=%LIB%;c:\oracle\oci\lib\msvc
cd %QTDIR%\src\plugins\sqldrivers\oci
qmake oci.pro
nmake
If you are not using a Microsoft compiler, replace nmake with make in
the line above.
but make or nmake didn't work for me. Because I have not installed Microsoft Visual c++ on my machine.
I made instruction how to do this:
At first don't forget to install qt sources. During the installation check Sources checkbox.
then download and install oracle client win32_11gR2_client.zip. choose Runtime option during installation.(even if you are using 64 bit os download 32 bit version on oracle client). It creates c:\app\user\product\client_1... directory
then open qt minGW command line(start ->all peograms -> qt[version] -> [version] -> MinGW [version] -> Qt [version] for Desktop MinGW [version]) and move to the oci source folder:
cd C:\Qt\Qt[version]\[version]\Src\qtbase\src\plugins\sqldrivers\oci
then as documentation says include OCI(Oracle call interface) path and library:
set INCLUDE=%INCLUDE%;c:\app\user\product[version]\client_1\oci\include
set LIB=%LIB%;c:\app\user\product[version]\client_1\oci\lib\msvc
5.compile oci driver by executing these two lines:
qmake oci.pro
mingw32-make
it will creates two .dll files for you qsqloci.dll(release version) and qsqlocid.dll(debug version)
last step is to copy these two files into qtcreator installation folder.
go to the:
C:\Qt\Qt[version]\[version]\Src\qtbase\plugins\sqldrivers
and copy these files into:
C:\Qt\Qt[version]\[version]\mingw[version]\plugins\sqldrivers
and you are ready to go. to check connection try this code:
#include <QCoreApplication>
#include <QtSql>
#include <QDebug>
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
QSqlDatabase db = QSqlDatabase::addDatabase("QOCI");
db.setHostName("MY_IP_OR_HOST_NAME");
db.setDatabaseName("XE");
db.setUserName("test");
db.setPassword("test_password");
if (!db.open())
{
qDebug() << db.lastError().text();
}
else{
qDebug() << "Wow opened";
}
return a.exec();
}
You should use QODBC instea of QOCI.
gogagubi's answer is good, but step 4 does not work for me because set INCLUDE and LIB does not work for mingw32-make.
It need to set INCPATH and LIBS in oci.pro or use:
qmake "INCPAH +=c:\app\user\product[version]\client_1\oci\include
LIBS +=-Lc:\app\user\product[version]\client_1\oci\lib\msvc" oci.pro
Add the following lines to the oci.pro:
INCPATH +=c:\app\user\product[version]\client_1\oci\include
LIBS+=-Lc:\app\user\product[version]\client_1\oci\lib\msvc
ciao tutto;
you can connect to oracle db with QODBC driver if it exist;(default in Qt windows is exist) Like below:
QSqlDatabase db=QSqlDatabase::addDatabase("QODBC");
db.setConnectOptions();
db.setDatabaseName("Driver={Microsoft ODBC for Oracle};Server=127.0.0.1:1521;Uid=ep;Pwd=605605");
if(!db.open())
exit(0);
QSqlQuery query(db);
query.exec("select * from t");
while(query.next())
QMessageBox::information(0,"",query.value(1).toString());
this is connected and allow to execurte query;
buona fortuna;
I want to learn how to code GUI programs in Linux, so I chose GTK3, but I'm running into some issues compiling the code for a simple blank window in GTK3. I'm using the Code::Blocks IDE, and this is my code. I'm almost certain it's correct because I copy-and-pasted it from a well known GTK tutorial site. Anyway, here's the code I have:
#include <gtk-3.0/gtk/gtk.h>
int main( int argc, char *argv[])
{
GtkWidget *window;
gtk_init(&argc, &argv);
window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_widget_show(window);
gtk_main();
return 0;
}
The code can't compile, and Code::Blocks states: "fatal error: gdk/gdk.h: No such file or directory"
I don't know why it says this, because I can look in my usr/include folder and I see the gdk folder as well as gdk.h within it. Before I tried to compile the code I installed GTK 3.0+ via the following console command:
sudo apt-get install libgtk-3-dev
What am I doing wrong? I would greatly appreciate any help you guys can give me.
just use #include .
if u build with pkg-config and gcc, it should looks like gcc -Wall filename filename.c -o pkg-config --cflags --libs gtk+-3.0
I am trying to decode a .wav file using QAudioDecoder class. Even though I had included the QtMultimedia module into my .pro file by adding
QT += multimedia I am receiving an error that service for the QAudioDecoder was not found. I am not able to see where to problem lies.
I am using Qt 5.1.0 with MingGW 4.8 32 bit on Windows 7.
Error message:
defaultServiceProvider::requestService(): no service found for - "org.qt-project.qt.audiodecode"
.pro file:
QT += core
QT += multimedia
QT -= gui
TARGET = test
CONFIG += console
CONFIG -= app_bundle
TEMPLATE = app
SOURCES += main.cpp
main file:
#include <QCoreApplication>
#include <QAudioDecoder>
#include <QAudioBuffer>
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
QString pathToFile = "C:/Users/Mateusz/Documents/Szkola/Sound Processing/Lab1/artificial/easy/506Hz.wav";
QAudioDecoder decoder;
decoder.setSourceFilename(pathToFile);
decoder.start();
while(decoder.bufferAvailable()) {
QAudioBuffer buffer = decoder.read();
qDebug() << "Buffer size: " << buffer.byteCount();
}
return a.exec();
}
The Multimedia module uses plugins that are different on each platform (or compiler).
See http://qt-project.org/wiki/Qt_Multimedia_Backends
On Windows you have DirectShow and MediaFoundation (WMF).
Only the WMF plugin implements audio decoding features.
WMF plugin is only available with MSVC compiler.
See http://qt-project.org/doc/qt-5.1/qtmultimedia/platform-notes-windows.html
I had the same problem in Qt5.5 running under Linux.
The problem disappeared after upgrade to Qt5.5.1 using their MaintenanceTool.
I also struggled with this issue and finally got it to work by using the MS visual studio compiler in QT Creator, like Fernando Pelliccioni suggested.
Steps were:
-Use the Qt MaintenanceTool to add support for msvc2013
-Install Visual Studio 2013
-In Qt Creator go to Projects->Manage Kits and add msvc2013
-Build and run. Now QAudioDecoder works.
I've install Netbeans 7.2 and Qt 5 on Windows7. Everything compiles fine.
But recently when I create a Qt form and try to use it in this way:
New Project > C/C++ Qt Application > Finish
Right click on new Qt project > New > Qt Form > Finish
After saving ui file in Designer
This error appears:
newForm.h:11:24: fatal error: ui_newForm.h: No such file or directory
The content of main.cpp is :
#include <QGuiApplication>
#include "newForm.h"
int main(int argc, char *argv[])
{
// initialize resources, if needed
// Q_INIT_RESOURCE(resfile);
QGuiApplication app(argc, argv);
// create and show your widgets here
return app.exec();
}
I tried to manually create ui_xwz.h file and add it to my project. But I want it work automatically as same as before. How can I solve it?
I have a ridiculous solution, Maybe we should report it as a bug to Netbeans or Qt.
Go and active QtSVG and QtXml modules of your project and rebuild it. I tested this way and the problem vanished.