@aha_1980, @Buckwheat Thank you very much! This is very helpful.

Don't worry, this code has been in production for twenty-five (25) years, and has run on hundreds of thousands of desktops. It was first written with compilers that didn't have 'const'! We'll deal with it when we have a program that runs. It's all good :o)

@jsulm You were right. I finally understood what you meant by getting the db at any time. Thank you very much for your help!

This is my working code:

#include "f1_system.h" #include <QtSql/qsqldatabase.h> #include <QtSql/qsqlquery.h> #include <QtSql/qsqlerror.h> #include <QtSql/qsqldriver.h> F1_System::F1_System(QWidget *parent) : QMainWindow(parent) { ui.setupUi(this); QSqlDatabase db = QSqlDatabase::addDatabase("QODBC", "dataB"); QString connectionString = "Driver={SQL Server};Server=DESKTOP-4K9MAS2\\SQLEXPRESS01;Database=Formula1_BD;Trusted_Connection=yes;"; db.setDatabaseName(connectionString); connect(ui.loginPushButton, SIGNAL(clicked()), this, SLOT(validateLogin())); } F1_System::~F1_System() { QSqlDatabase::database("dataB").close(); } void F1_System::validateLogin() { if (QSqlDatabase::database("dataB").open()) { QString selectUser("SELECT Username FROM Users WHERE Username = '" + ui.usernameInputField->text() + "' AND Userpassword = '" + ui.passwordInputField->text() + "';"); QSqlQuery qry(selectUser, QSqlDatabase::database("dataB")); if (qry.next()) ui.label->setText("Status: You are logged in!"); else ui.label->setText("Status: Wrong credentials!\nTry again!"); } else ui.label->setText("Failed to connect to the database!"); }

Hello @sophonet ,

thank you very much for your answer.
You are right. In the meantime, my problem with Qt 5.9.5 was solved:

[https://codereview.qt-project.org/#/c/236948/2/src/corelib/tools/qalgorithms.h](link url)

Many greetings from Germany,
Matthias

@aha_1980 The change was in qcompilerdetection.h Line: 1349.

Weird thing is that now that I've fixed the linker issue I was experiencing, compiler is Not complaining of the code - I've reverted qcompilerdetection.h back to its original version. Even though, looking at the file in VS the offending lines are still marked red, I guess moc is taking care of it somehow.

@JonB Do not misunderstand. I have not said that I will not try your solution. I have just explained my temporary approach that I'm currently using to find the origin of my crashes. For the future I will take time to investigate more with the hope to have a generic solution to apply on all my VS solutions.

Before crossing that feature definitively, I'd recommend asking on the interest mailing list. You'll find there Qt's developers/maintainers. This forum is more user oriented.

Perhaps some dll files are missing.

@SGaist It worked. Thank you so much.

hi @cc672012

you may have several problems, but the first one is that you assigned a 32bit compiler to a 64bit Qt version. That will not work.

@aha_1980 i cleaned my old project build tried it again. The build is successful but when i try to run same error as mentioned above.

any changes : just uninstalled Qt5.9.1 .other than that nothing much.

this is my compiler tab if it helps any !!

p.. i have downloaded windows 10 SDK too now there is no triangle on msvc 32bit one but the problem still remains :/ .

Hi,

Use the amd64 command prompt when building Qt.

Also note that Qt 5.4 was released before VS2015 came out, you should use at least Qt 5.6 with this compiler

Hi,

One small correction: you can use Visual Studio 2017 with libraries built for VS2015, these two compilers are compatible (which is the first time two Microsoft Compilers are compatible).

@srikanth
https://stackoverflow.com/questions/19575747/error-lnk2038-mismatch-detected-for-msc-ver-value-1600-doesnt-match-valu

and others like https://stackoverflow.com/questions/14692019/linking-error-because-of-different-versions-msvc-and-qt-libraries

In case anyone else falls into this error, i found the solution was that my Debug build in Visual studio was linked against QChart.lib, not QChartd.lib. Once i changed this it worked.

Hi,

Thanks for replying, I solved my issue. I was missing some "#include" in different files.

@jweber

Hi and welcome to devnet forum

I am not sure if this is possible at all. It is quite a long time back when I used MSVC. However, I am having no good feelings when I read your post.

I had started recently compiling for Android. Since a couple of years I am using Qt creator and MinGW compiler. The Android compiling process is GCC-based as MinGW is. That is taking some ambiguities out. Therefore my recommendation you may save time and conserve some hair, when you are going directly to Qt creator when starting Qt for Android.

The error message you are presenting is probably because of the mix MSVC and GCC-make, which might errornously recognized as linux version. I might be wrong there, but this looks fishy.

In case you decide to follow my advice, also go directly to Qt 5.9.0 (at least). There seem to be recent change also on the Android side, which was not really helpful in getting started. I had struggled quite a bit when trying to follow the different advices and tutorials. "gradle" seems to have replaced "ant" already on Android. At the end I had decided to go directly to newest Qt5.9.0 at that time instead of fiddling around with the previous stuff. That went much easier.

@John_A._Myer yes

@koahnig

SetName takes in a char* because it is a part of an API.

@kshegunov

Here are the relevant linker calls. I don't know how to get the .pro file from a VS project.

Here is the linker call in the project that makes the dll:

/OUT:"E:\Users\misappsci\Documents\Projects\yyy\x64\bin\yyy3D.dll" /MANIFEST /LTCG:incremental /NXCOMPAT /PDB:"E:\Users\misappsci\Documents\Projects\yyy\x64\bin\yyy3D.pdb" /DYNAMICBASE "sl_zed64.lib" "opencv_world310.lib" "cudart.lib" "kernel32.lib" "user32.lib" "gdi32.lib" "winspool.lib" "comdlg32.lib" "advapi32.lib" "shell32.lib" "ole32.lib" "oleaut32.lib" "uuid.lib" "odbc32.lib" "odbccp32.lib" "qtmain.lib" "Qt5Core.lib" "Qt5Multimedia.lib" "Qt5Gui.lib" "winmm.lib" /IMPLIB:"E:\Users\misappsci\Documents\Projects\yyy\x64\bin\yyy3D.lib" /DEBUG /DLL /MACHINE:X64 /OPT:REF /PGD:"E:\Users\misappsci\Documents\Projects\yyy\x64\bin\yyy3D.pgd" /SUBSYSTEM:CONSOLE /MANIFESTUAC:"level='asInvoker' uiAccess='false'" /ManifestFile:"x64\3DRelease\yyy3D.dll.intermediate.manifest" /OPT:ICF /ERRORREPORT:PROMPT /NOLOGO /LIBPATH:"C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v8.0\lib\x64" /LIBPATH:"C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v8.0/lib/x64" /LIBPATH:"C:\Program Files (x86)\ZED SDK\dependencies\opencv_3.1.0/x64/vc14/lib" /LIBPATH:"C:\Program Files (x86)\ZED SDK\lib" /LIBPATH:"C:\Program Files\boost\boost_1_63_0/lib/x64" /LIBPATH:"C:\Qt\5.7\msvc2015_64\lib" /TLBID:1

Here is the linker call for the project that uses the dll and has the run time error:

/OUT:"E:\Users\misappsci\Documents\Projects\Aerie\host_x64\x64\Release\AerieLib.dll" /MANIFEST /LTCG:incremental /NXCOMPAT /PDB:"E:\Users\misappsci\Documents\Projects\Aerie\host_x64\x64\Release\AerieLib.pdb" /DYNAMICBASE "Qt5Core.lib" "Qt5Gui.lib" "Qt5Multimedia.lib" "yyy3D.lib" "sl_zed64.lib" "opencv_world310.lib" "cudart.lib" "kernel32.lib" "user32.lib" "gdi32.lib" "winspool.lib" "comdlg32.lib" "advapi32.lib" "shell32.lib" "ole32.lib" "oleaut32.lib" "uuid.lib" "odbc32.lib" "odbccp32.lib" /IMPLIB:"E:\Users\misappsci\Documents\Projects\Aerie\host_x64\x64\Release\AerieLib.lib" /DEBUG /DLL /MACHINE:X64 /OPT:REF /PGD:"E:\Users\misappsci\Documents\Projects\Aerie\host_x64\x64\Release\AerieLib.pgd" /MANIFESTUAC:"level='asInvoker' uiAccess='false'" /ManifestFile:"x64\Release\AerieLib.dll.intermediate.manifest" /OPT:ICF /ERRORREPORT:PROMPT /NOLOGO /LIBPATH:"C:\Qt\5.7\msvc2015_64\lib" /LIBPATH:"C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v8.0/lib/x64" /LIBPATH:"C:\Program Files (x86)\ZED SDK\dependencies\opencv_3.1.0/x64/vc14/lib" /LIBPATH:"C:\Program Files (x86)\ZED SDK\lib" /LIBPATH:"E:\Users\misappsci\Documents\Projects\yyy\x64\bin" /LIBPATH:"C:\Program Files\boost\boost_1_63_0/lib/x64/" /TLBID:1

Hi,

Which exact version of Windows are you using ? Patch/Update applied ?

@ynirkin said:

It does work on debug configuration.
I did set the QT_QPA_PLATFORM_PLUGIN_PATH environment variable to "Qt\5.7\msvc2015_64\plugins\platforms" directory and I also tried to create a platforms directory in my exe directory and copy the qwindows.dll there.

You shouldn't set it to the "platforms" folder, but to the (parent) "plugins" folder instead.

QTableWidget already has an internal model otherwise it's a QTableView.

Hi,

A bit off topic but why not use the libtiff bundled with Qt ? That could avoid you the trouble having to build an external version of it. Unless you absolutely need that specific version.

The database is on a remote server elsewhere, so the openssl stuff I have no clue outside what I included already from my system.

@jsulm thanks for the tipp!

I solved my problem by reinstalling VS2015 Update 2.

Thanks. I take a look at hat and at http://tishion.github.io/QCefView/

But then we end up in using an extra lib. Something we want to avoid.... :-(

@Simurr
Hi,

I am not sure whether WiFi Direct is among the supported APIs which can be co-used for classic apps. But usually you need to take care of a couple of things.

Most promintently you will need to link against runtimeobject.lib to find Activation symbols.
I just pushed a change for positioning to showcase, how a "generic" porting from WinRT to classic apps can work. See https://codereview.qt-project.org/#/c/159330/ for some details.

Hi and welcome to devnet,

Out of curiosity, are you using Qt Creator or Visual Studio ?

On a side note, there's Qt 4.8.7 that is available.

same client and server setup, but different out put sounds very strange...
I would suspect some misconfiguration on the VM webserver.
But here are some thoughts:

Some servers also behave strange when no USER-AGENT header is sent with the request Is the javascript embedded`/inlined or referenced externally as file in the yhead> section? what do the IIS logs tell?

For what it's worth, qmake in Qt 5.5.1 doesn't seem any better. I would like to set /SUBSYSTEM:WINDOWS,6.1 to specify that only Windows 7 and later are allowed, but qmake is still ignoring the version part when generating the vcxproj.

Hi,

For qmake you can use something like:

INCLUDEPATH += /path/to/OpenCV/include/folder LIBS += -L/path/to/OpenCV/lib/folder \ -lopencv_coreXXX \ -lopencv_imgprocXXX \ -lopencv_highguiXXX \ # next OpenCV libs you need

Note that you can also setup your project on your Windows machine using either qmake or cmake and once it's building there, bring it over to your Linux target, and add the Linux specific pieces to link to OpenCV

@taulant01
Sorry for not being clear.
I think the sample uses old opengl calls for lighting and textures.

The old way is called fixed pipeline. And new is called modern/programmable pipeline.

Most (older) samples use the fixed style and it just don't work nowadays.

please read
http://www.gamedev.net/topic/466751-fixed-pipeline-vs-programmable-pipeline/

For good info to learn opengl (modern)
http://www.opengl-tutorial.org/

Qt doen't replace glutWireTeapot etc.

Yes, but except for a one-time example what's the use of it these days? One should use shaders and VBOs anyway.