Can't launch application. dll is missing

koahnig

According to this post apparently not an issue of Qt libs, but MSVC

za83

I get this error even in a simple console application on Qt. I don't get this error in projects which don't use Qt.

hskoglund

Hi, just to add to @koahnig, it's correct that the same error also occurs for a simple Qt console application. Try update Visual studio 2017 to version 15.4.4 on the PC that has the error.

za83

15.4.4 already.

za83

Firstly, the problem was with vcruntime140d_app.dll. But then it somehow appeared on my drive. I updated everything what I could. Now I need api-ms-win-core-rtlsupport-l1-2-0.dll. I have just api-ms-win-core-rtlsupport-l1-1-0.dll

hskoglund

Just checking: you only installed the plain vanilla "msv2017 64-bit" version of Qt 5.9.2 and not any version with a "UWP .." prefix?

za83

winrt_x86_msvc2017

JonB

@za83
Couple of suggestions:

https://stackoverflow.com/a/45773325/489865 says that file has just been supplied with "updated my VS2017 from v15.2 to v15.3.1" (August?) Make sure your VS 2017 is updated?
Are you sure you really don't have the file 9assuming you're updated)? Post at https://social.msdn.microsoft.com/Forums/en-US/e9a3e78c-7764-4145-bdc0-e354e3e599de/how-the-api-set-dlls-work?forum=windowssdk They require: "You can see them in explorer by allowing the display of "protected operating system files".".
Although I don't think it solves your problem, https://forum.qt.io/topic/66765/api-ms-win-core-rtlsupport-l1-2-0-missing-on-a-windows-7-deployment post on this site might be worth reading through?

za83

It looks like qt-msvc2015 works well. But not winrt_x86_msvc2017.
(Platform toolset in VS 2017-v141).

hskoglund

Hi, winrt_x86_msvc2017 works fine if you upgrade your Windows 7 to Windows 10. (But "msvc2017 64-bit" works on both Windows 7 and Windows 10.)

za83

Now I built in Windows 10 32-bit. It requires msvcp140_app.dll. But there is no that dll on my drive.

hskoglund

Hi, msvcp140_app.dll should be installed in C:\Program Files\WindowsApps\Microsoft.VCLibs.140.00_14.0.25426.0_x86__8wekyb3d8bbwe, but perhaps you forgot to enable UWP development? Start the Visual Studio Installer and check, see picture below:

Also: make sure you've enabled Developer mode in Settings.

za83

This post is deleted!

za83

@hskoglund it helped. But in Windows 7 I still get error

The program can't start because api-ms-win-core-rtlsupport-l1-2-0.dll is missing from your computer. Try reinstalling the program to fix this problem.

Can I launch the program built with Qt 5.10 on Windows 7?

hskoglund

@za83 You can launch a program built with Qt 5.10 on Windows 7 if it's built using the "MSVC 2017 64-bit" compiler version.

But you can not launch a program built with Qt 5.10 on Windows 7 if it's built using the "UWP x86 (MSVC2017)" compiler version.

That's why you get that error on Windows 7, you built your Qt program using the "UWP x86 (MSVC2017)" version :-(

Note: if you need a 32-bit version of Qt 5.10 that's not UWP-flavored, you need to download and install the older compiler MSVC2015 from Microsoft, then you can install "MSVC 2015 32-bit" Qt compiler version, which will allow you to run 32-bit Qt programs on WIndows 7.

za83

@hskoglund with Qt 5.10 msvc2015 I get error

The program can't start because api-ms-win-core-rtlsupport-l1-2-0.dll is missing from your computer. Try reinstalling the program to fix this problem.

Qt 5.9 it's ok.

SGaist

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).