I am trying to add a custom sqlite3 regexp function into my Qt application (as recommended by this answer). it works fine in windows but in fedora i get this error:
:-1: error: sqlite3.o: undefined reference to symbol 'dlclose##GLIBC_2.2.5'
after adding LIBS += -ldl to .pro, compile is ok but when run command query.exec(); return value is false without any description and qtregexp() function don't run.
Edit:
after comment
LIBS += -ldl
SOURCES += sqlite\sqlite3.c
HEADERS += sqlite\sqlite3.h
and add
LIBS += -lsqlite3
to .pro i get segmentation fault with sqlite3_create_function .
if i open a database with native sqlite3 API (sqlite3_open) Instead handle of QSqlDatabase , sqlite3_create_function works very well
Related
It's my first time using opencv and i'm having isue finding where the error could be, i followed this tutorial to install everything (https://wiki.qt.io/How_to_setup_Qt_and_openCV_on_Windows)
but i keep getting this error whenever i try to compile :
D:\opencv\releases\bin\libopencv_core400.dll:-1: erreur : LNK1107: invalid or corrupt file: cannot read at 0x3F8 libopencv_core400.dll
The other issue is that the solution for this error is to link against a .lib but opencv only has .dll on my computer
.pro
INCLUDEPATH += D:\opencv\build\include
LIBS += D:\opencv\releases\bin\libopencv_core400.dll
LIBS += D:\opencv\releases\bin\libopencv_calib3d400.dll
LIBS += D:\opencv\releases\bin\libopencv_highgui400.dll
LIBS += D:\opencv\releases\bin\libopencv_imgcodecs400.dll
LIBS += D:\opencv\releases\bin\libopencv_imgproc400.dll
LIBS += D:\opencv\releases\bin\libopencv_features2d400.dll
This is an older thread, but maybe anybody with the same problem can make some use of it:
You can only use the built OpenCV-libraries for build-configurations using the same compiler. In your case: MinGW_32.
If you try to build your project with another build configuration, e.g. MSVC2017, you'll get these errors.
Selecting MinGW 32-bit as build configuraition fixed it for me.
I work on Mac OS 10.8.5 and Qt 5.1.1 with among other things, qdebug class which work well with some projects and doesn't compile with some others. I've already tried to re-install Qt which didn't change a thing.
It is certainly due to the use of SDL library (?!) but it used to work fine. Here's a part of the compilation output :
In file included from ../../Stage/Joker/tests/SDLTest/main.cpp:7:
In file included from /Applications/QT/5.1.1/clang_64/include/QtCore/QDebug:1:
In file included from /Applications/QT/5.1.1/clang_64/include/QtCore/qdebug.h:46:
In file included from /Library/Frameworks/QtCore.framework/Headers/qhash.h:46:
/Library/Frameworks/QtCore.framework/Headers/qchar.h:76:5: error: unknown type name 'QT_ASCII_CAST_WARN_CONSTRUCTOR'
QT_ASCII_CAST_WARN_CONSTRUCTOR QChar(char c);
^
If needed, I can provide more output or unworking Qt classes.
I build my code with Qt => Build => Run
Unfortunatly, I'm unable to reproduce the code on an other computer.
Here's the pro file (which work well with all my co-workers, except me) :
TEMPLATE = app
SOURCES += main.cpp
OBJECTIVE_HEADERS += ../../libs/PhGraphic/SDLMain.h
OBJECTIVE_SOURCES += ../../libs/PhGraphic/SDLMain.m
LIBS += -framework Cocoa
QMAKE_CXXFLAGS += -F/Library/Frameworks
QMAKE_OBJECTIVE_CFLAGS += -F/Library/Frameworks
LIBS += -F/Library/Frameworks
LIBS += -framework SDL -framework SDL_image -framework SDL_ttf
I'd once had this problem after installing a software: it created a QtCore.framework in the /Library/Framework folder that overrided the QtCore of your current Qt kit (due to QMAKE_CXXFLAGS += -F/Library/Frameworks).
It's qDebug, and there are two overloads:
a stream-returning function
qDebug() << "foo";
a printf-style function
qDebug("foo");
You need to provide a minimum reproducible test case for us to help you.
How are you building your code? Are you using qmake to produce the Makefile? We'd need to see the .pro file at the minimum, and please minimize it by removing useless boilerplate comments etc.
A problem with a Qt *.pro file:
TARGET = ProgName
TEMPLATE = app
CONFIG += console
QT += core
QT += gui
LIBS += -LC:\\Qt\\4.8.5\\bin
LIBS += -LC:\\Qt\\4.8.5\\lib
LIBS += -LS:\\lib
# LIBS += -lQtCored4 # not necessary
# LIBS += -lQtCore4
# LIBS += -lQtGuid4
# LIBS += -lQtGui4
SOURCES += ...
HEADERS += ...
I get these linker errors:
:-1: error: cannot find -lQtGuid
:-1: error: cannot find -lQtCored
collect2.exe:-1: error: error: ld returned 1 exit status
All the DLLs exist in the specified directories.
The documentation did not help much.
This pro file worked a few days ago, and it seems to have issues since I installed Qt 5.1 (this is not used, yet; I am still working with Qt4).
Platform: Windows 7, MinGW, Qt 4.8.4
You only need the following content:
TARGET = ProgName
TEMPLATE = app
CONFIG += console
QT -= gui
SOURCES += ...
HEADERS += ...
That is because core and gui are added to the QT variable automatically. In this particular case however, you can remove the gui default if you wish to build a console application as you seem. Although "CONFIG += console" could eventually do that for you. Besides this, everything will work automatically for you, so you do not need to pass the library path to the qt libraries and so forth. You would only need to use QT += widgets and similar lines if you used further Qt modules there are not there by default. Even then, you would not need to set the Qt library path as you did in your question.
Besides, if you wanna target cross-platform later, you may wish to add this:
CONFIG -= app_bundle
to avoid creating Mac bundle for console based applications.
If you have multiple versions of Qt installed as it seems, you need to use the qmake from the required version, and it will be fine. Just to give an example: I use qmake for Qt 5 on my Archlinux system, and qmake-qt4 for Qt4.
On windows, you should either have the desired qt installation bin in the path before the undesired, or you need to call desired qmake explicitly, something like C:\path\to\my\desired\qmake.
There's no need to link to any Qt libraries afaik.
If you're using Qt Creator you need to make sure Qt 4.8.4 is properly recognized in Tools - Options - Build & Run - Kits. Since you installed 5.1 this may no longer be true. Then set the 4.8.4 kit for your project and compile it (cleaning the build directory also helps sometimes).
While building a game code in Qt simulator I'm getting the following error:
-1: error: LNK1104: cannot open file 'libEGL.lib'
I have added following code to add library files:
INCLUDEPATH +=
C:\Imagination_Technologies\POWERVR_SDK\OGLES2_WINDOWS_X86EMULATION_2.08.28.0634\Builds\OGLES2\Include\
LIBS +=
-LC:\Imagination_Technologies\POWERVR_SDK\OGLES2_WINDOWS_X86EMULATION_2.08.28.0634\Builds\OGLES2\WindowsX86\Lib\
-llibEGL -llibGLESv2
LIBS += -llibEGL -llibGLESv2
It's been some time since I stopped programming under Windows, but as far as I can remember qmake uses the same mechanism used in Linux on all the supported OS (http://doc.qt.io/qt-5/qmake-project-files.html). Which means you should write:
LIBS += -LC:\Imagination_Technologies\POWERVR_SDK\OGLES2_WINDOWS_X86EMULATION_2.08.28.0634\Builds\OGLES2\WindowsX86\Lib\ -lEGL -lGLESv2
provided the path is correct of course (note that I removed the 'lib').
I have coded a program in QTcreator on linux and when i tried to port it to windows.
Program compiles without any errors.
But when i run the program it exits automatically
Starting C:\Projects\LIG\debug\LIGenerator.exe...
C:\Projects\LIG\debug\LIGenerator.exe exited with code -1073741515
I tried to debug it using QT creator debugger. But flow of the program does not pass even through main.cpp
how to debug the program and fine where is the errors.
Update
In the .pro file the INCLUDEPATH and LIB are the following
win32:INCLUDEPATH += "C:\Program Files\Expat 2.0.1\Source\lib"
win32:INCLUDEPATH += "E:\confuse-2.7\confuse-2.7\src"
win32:INCLUDEPATH += "C:\Projects\LithologyInputGenerator5\XML"
win32:LIBS += -L"C:/Program Files/Expat 2.0.1/Bin" \
-L"C:/Program Files/GnuWin32/lib/" \
-L"E:/confuse-2.7/confuse-2.7/windows/msvs.net/libConfuse/Release"
LIBS += -lexpat \
-lcrypto \
-lssl\
-lconfuse
unix:LIBS += libgsoap++.a \
-lgsoap
win32:LIBS += -lwsock32
Update
I have used dependency walker as mentioned which help me to find the missing dependencies. I have now fixed all the dependencies except MPR.DLL ( Warning: At least one module has an unresolved import due to a missing export function in a delay-load dependent module.). IT was not missing so i left it out.
Also i have used a configuration file. I have now copied the conf file to debug dir for WIN32 compiler.I don't remember whether i have used more than one conf file
Still the program automatically exit with code -1073741515
. I tried to debug program using GUI debugger . But program is not even breaking at main also.
Could any one help me to get out of the this?
-1073741515 is the same as 0xC0000135 which I think often is because a a dependency is missing. I'd suggest checking that all DLLs your app depends on are in the correct locations.
You can use Dependency Walker for this.
I had the same problem, fixed by changing project settings Projects -> Tool chain -> MinGW (x86 32bit)