So I am working on my Diploma Thesis, and so far everything went fine.
So this week I installed Win8.1 on my PC and installed QT, implemented some things and wanted to send the release version of my program to my company.
I compiled the hole thing, copied it to my release folder and i got an error.
"This application failed to start because it could not find or load the Qt platform plugin "windows"."
I googled and found out that I have add a folder named "platforms". Said and done. Same error. I also tried to copy the hole plugins folder to my release folder. Same error.
I really need help because my boss isn't happy about giving in work too late.
I hope someone can help me.
Do you also have "qminimal.dll" placed in your platforms directory?
Edit:
Sorry, "qminimal.dll" was not displayed in my previous post.
I found the Problem!
Previously i used the dll's from my old QT installation. I just copied the ones from the new Installtion into a folder and the exe. I don't even need the qwindow.dll now.
BUT! I works now... :)
Is there a way, that I create my own DLL, just for my Application?
But still thanks for your help!
Related
Firstly, I would not post here because I did not look up questions and answers already relating to this. I have tried the solutions, to little avail, as most questions revolved around previous versions, and were vague in some way. Below are the pages I visited:
Links
https://forum.qt.io/topic/78962/how-to-use-qt-with-visual-studio-2017/13, this ruined my case even worse. Something temporarily broke down because of the last 2 steps, but was back again to normal after restarting QT.
How to build Qt for Visual Studio 2010, I have VS 2017, and the command line prompt for that doesn't recognize 'configure.exe'. This is the line of code:
configure.exe -release -no-webkit -no-phonon -no-phonon-backend -no-script -no-scripttools -no-qt3support -no-multimedia -no-ltcg
Building Qt for Visual Studio 2010 - cannot open file 'qtmaind.lib', related again to VS 10, should I really work on the 2010 version? Is there a way to configure it for 2017, as it is the tool I am most familiar with?
qt cannot open input file 'c:\Qt\qt\lib\qtmaind.lib', I have no idea what QMAKESPACE is. I just started yesterday with the intent of making my semester project in it, so I do not have any professional experience with QT previously, or any kind of experience in general. The link attached to the ticked answer, https://doc.qt.io/archives/qt-4.8/supported-platforms.html, does not offer any kind of help. It just details what systems it supports. I am currently using Windows 10, version 1809.
https://www.qtcentre.org/threads/23917-fatal-error-LNK1181-cannot-open-input-file-qtmaind-lib, really lost me. Where are the qt sources that Nish is talking about? Are they from here: https://www.qt.io/offline-installers, from "Source Packages And Other Releases". Where are these files? Did they come with the installer from here: https://www.qt.io/download ? With what do I compile them with? Will these compiled files make some .exe files? Even more, these posts are from 2009.
What Is The Problem?
I watched the video by Derek Banas' series on QT ( https://www.youtube.com/watch?v=I96uPDifZ1w&t=297s ). Here are the steps I took to set up QT:
i): Went to https://www.qt.io/download.
ii): Selected "Go Open Source", and then clicked on download
iii): Started the QT setup after download. In the packages menu, I selected
the default. This gave me QT 4.6.3.
iv): Made a new project as shown by Derek Banas.
v): Upon selecting the green arrow on the bottom left, with debug option chosen, I pressed it. It gave me the error:
LNK 1104: Cannot open file 'qtmaind.lib'
vi): Changed to release, profile, gave me this error:
This application failed to start because it could not find or load the Qt platform plugin "windows"in "".Reinstalling the application may fix this problem.
I tried reinstalling it. No use. I went here: https://www.qt.io/offline-installers, and download 5.12.1, the latest, plus the zip file in "Source Packages And Other Releases". Again performing the same as above, with the same errors.
Confused because the video did not address such an issue. Looked online. did not find much here, thus, I am here. My hypothesis:
i): This is something related to my path variables. Since both versions exhibit this issue, it means that fault is from my side, not QT's.
ii): Some windows .dll files are missing. But I do not know what files they are.
Before You Answer
Please just give me the directions I should move in to solve this issue. I do not have any idea where to go from here, but I really, really, really want to learn QT as part of my C++ learning, and I'm willing to work; I just lack the guidance.
If this is downvoted, please just send me some links which specifically address my issue so I can head over there. I would be very glad for the directions. :)
And lastly, thank you to all of you for reading through this wall of text!
Here are a few pictures of what I am seeing:
It finally worked!
If this is of some help to anybody out there, please do not select the default button at the installation phase. Depending on your time, please go ahead and select MSVC 64 bit, MSVS < 2nd Latest Version >, and MinGW < Latest Version > 64 Bit, that shows up at the installation time. This will allow you to use a different kit that you can use to run your application with. To access this kit, go to the green button, hover over it, or click it, and there will be a kit called, desktop QT MSVC 64-bit, and then select this, and then run your program. This will run your program properly.
I'm new to Qt, but have been working with Visual studio for C/C++ development for a few years. Now I'm trying to build a GUI for my project. I installed Qt 5.11.0 and the Qt VS Tools on both my work computer and home PC. At work I can build and run my project with the VS debugger, however on my home system I can build but can't run either with VS debugger or simply launching the app. I tried in release and it runs fine.
The error I'm getting is :
The code execution cannot proceed because VCRUNTIME140D_APP.dll was not found.
I get 4 of these, the first two want VCRUNTIME, the second two want MSVCP140D_APP.dll.
Solutions I've tried so far :
Uninstalled Win SDK and reinstalled
Uninstalled VS2017 and SDK and reinstalled
Searched System32, SysWOW64 and VS install directories - found msvcp140d.dll and vcruntime140d.dll, but no _app.dlls
Does anyone know what these are included with and where to get them? I can't figure out why I have them on my work computer but not at home. I have the same VS updates, same Qt version, and SDK on both systems.
Using :
Visual Studio 2017 v15.7.1
Qt 5.11.0 - msvc2017_64
I suppose I can just copy the .dll's from my work pc and drop them in the appropriate locations on the other, but I'd like to know what they should have been installed with so I can have the same setup on both systems.
Edit:
I also tried changing the platform toolset to VS2015 with Qt versions msvc2015_64 and winrt_x64_msvc2015
I found this post concerning the same missing _app.dll files. There wasn't any answer there, which is why I tried reinstalling the SDK in the hope the missing files were included there.
Edit 2:
I just scanned my entire system at work and it turns out that I don't have the missing .dll there either. That tells me that there is a difference in the project properties or configuration between the two. I use git for source control, and I am currently the only contributor to this project. When I try to build and run just the example from the getting started guide I have the same problem at home with missing _app.dll files, however it works fine at work. I'm totally confused now, and any hints are greatly appreciated.
Solution:
After trying for a couple of hours making new solutions etc. I decided to delete the entire build folder and put fresh copies of all the dependencies into it. My project now runs fine in debugging mode.
I'm fairly certain that when I originally copied the Qt .dll files into it I must have grabbed them from one of the winrt folders rather than the msvc2017_64 folder. To test I replaced the working .dll files with those from the winrt_x64_msvc2017 folder and sure enough the same errors again. So, this was a dumb mistake on my part, but hopefully it'll save someone else a lot of hair-pulling in the future.
Firstly, thank you in advance for at least reading this question.
Secondly, feel free to call me an idiot if this is a "no brainer"
Now down to the issue at hand...
I am running Ubuntu 16.04 (64bit) with QT Creator as my IDE and on the whole it works great. I can cross compile for the Raspberry Pi3 (running raspbian) and also compile plugins for X-Plane.
Everything was going great until I needed to implement MySql into my project. That's when it all went south.
I can not use the Qt library for this as X-Plane does not like anything Qt related in its plugins. But that is fine, I have connector-c++ working on that machine and it connects to my MySql server and does everything it's supposed to.
I think I have read just about every forum and watched every youtube video on this but can not get Qt Creator to compile with connector for the raspberry pi.
I wrote/compiled a test app locally (with g++) on the pi and it works great. However for some reason (government plot maybe?) it refuses to link the libraries when compiling under Qt Creator.
The error I get when compiling in QtCreator is:
undefined reference to `get_driver_instance'
Currently,
I have followed the instructions for setting up a cross compiler here:
https://wiki.qt.io/RaspberryPi2EGLFS
Downloaded the connector code from here:
git clone https://github.com/mysql/mysql-connector-cpp
I have followed the instructions for compiling connector-c++ here:
https://dev.mysql.com/doc/connector-cpp/en/connector-cpp-installation-source-unix.html
And I have banged my head 1000x on a brick wall here:
(picture of blood stained wall not available)
Also, I have tried compiling connector on my Ubuntu pc with paths to the pi's sysroot etc. but i think it made a 64bit version which causes Qt Creator to have a dummy spit about "unrecognized format".
I am hoping that this is just me having a "senior moment" and that someone can point me in the right direction.
To save putting up irrelevant logs/code I will wait until someone asks for it and then copy/paste what they need.
Again, thanks in advance and know that I will be eternally grateful for any light on this matter (preferably before I go even insanerer)
Well after 2 weeks of pain, I have solved this problem. Here is what I think is the issue:
Firstly, I found that mysqlcppconn is not needed (at least for me) and used the mysql libraries in /usr/lib
Secondly, the symlinks to libmysqlclient.so.6.0.22 were by default:
libmysqlclient.so.6 -> libmysqlclient.so.6.0.22
The compiler was looking for libmysqlclient.so which didn't exist. So I created the link (libmysqlclient.so -> libmysqlclient.so.6) and it worked!!
Thanks to all who helped.
I've looked for an answer during a few days and I haven't found anything similar anywhere;
I downloaded Qt from the official website, installed it and apparently compiling is fine. But whenever I try to execute (Ctrl+R) any app, even the basic one which only displays a window or widget, QtCreator itself crashes. No error message, nothing, just crashing.
I've tried to redownload and reinstall it a few times with different settings, but nothing will do.
I'm running QtCreator on Windows 7 64 bits. I'll try on my laptop which is also running windows and will update if I find anything.
Any help would be appreciated, I need to start a project as soon as possible. I'm relatively new to QT and if you need info on anything just ask me. Thanks :)
Use dependency walker, http://www.dependencywalker.com/
and post any missing dependencies. It is possible some install targets or options are missing from when you installed QtCreator, which can be resolved with the maintenance tool in the same directory you installed Qt.
Also, are you using the Visual Studio compiler(must have Visual Studio installed separately, and mark the option during install), or the Ming compiler(2 options checked during install or maintenance)?
Check if your antivirus is locking it, I had a similar issue time ago and it was due to antivirus (Avast specifically). Disable antivirus' realtime shields and try to execute a basic app.
It is necessary to use QtCreator? I use QtDesigner snd VS2013 and things go very well. :)
check this thread Qt Creator Plain C++ Project won't run/debug... and this C++ - QtCreator doesn't show any output
I set up OpenCV with Code::Blocks as per this tutorial: http://kevinhughes.ca/tutorials/opencv-install-on-windows-with-codeblocks-and-mingw/.
I've got as far as building the test program at the end successfully, but when I try to run it I get the following error: "The application was unable to start correctly (0xc00000be). Click OK to close the application."
The one thing that is certainly different from the tutorial for me is that I'm working with OpenCV 3.0.0, Code::Blocks 13.12 and the latest version of mingw (number not obvious from their website or the installer).
I found that other people had had this problem in the past, e.g. The application was unable to start correctly (0xc00000be)
However, it has been a long time since that thread was active, I'm working with newer versions of the software and, most importantly, the answer given there didn't help (I compiled openCV with the same mingw that I'm using with Code::Blocks), so I thought this question would be worth asking (sorry if it's not, I'm rather new to this).
Could anybody suggest a fix that might get rid of this error?
A few other things to note:
I didn't download the Code::Blocks that came with mingw as I was advised against it, I got them separately as per the tutorial
I have installed OpenCV and Code::Blocks on my E: drive, though mingw is still on my C:.
I have added both mingw and OpenCV to my PATH variable, and mingw to my Path variable
I have linked the libraries in both the main compiler settings for Code::Blocks and the Build Options of my project.
I'm working from a 64-bit Windows 7 Laptop, but I have done everything 32-bit style as advised in the tutorial.
Thanks in advance!
So, one solution I've found to this problem is to copy all the .dll files from "...\opencv\build\x86\mingw\bin" to the project file (build directory).
Having done that, the project will run fine. This still doesn't (directly) explain why it wont run without those files (at least, several sources including the tutorial imply it should), and so isn't really optimal. I will continue to look for a solution for this so I don't have to clutter every opencv project I make with the .dlls.
However, for anyone simply wanting to get stuck into coding who is having this problem, I recommend that solution.