[Development] Using qml.exe with a custom QML_ELEMENT plugin

[Elias Steurer]

I launch the qml app with these arguments (via VSCode launch.json):

             "args": ["-I", "C:\\Code\\cpp\\build_Hello_Debug","-f", 
"C:\\Code\\cpp\\qml-plugin-minimal\\Main.qml", ],

  * My example project contains a simple Main.qml. with my Hello QML_ELEMENT
      o "C:\Code\cpp\qml-plugin-minimal\Main.qml"
  * Build dir has a World.dll
      o "C:\Code\cpp\build_Hello_Debug\World.dll"
  * Below it contains the plugin in the Hello/World subdir:
      o "C:\Code\cpp\build_Hello_Debug\Hello\World\Worldplugin.dll"

     Hello {
         id:hello
         Component.onCompleted: {
             hello.speak()
         }
     }

Then when calling qml.exe it prints, see the first entry:

Modified PATH: "C:\\Code\\cpp\\build_Hello_Debug;C:\\Program 
Files\\Common 
Files\\Oracle\\Java\\javapath;C:\\VulkanSDK\\1.3.231.1\\Bin;C:\\Windows\\system32;C:\\Windows;C:\\Windows\\System32\\Wbem;C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\;C:\\Windows\\System32\\OpenSSH\\;C:\\ProgramData\\chocolatey\\bin;C:\\Users\\Eli\\Apps\\platform-tools;C:\\Program 
Files (x86)\\Tailscale IPN;C:\\Program 
Files\\dotnet\\;C:\\WINDOWS\\system32;C:\\WINDOWS;C:\\WINDOWS\\System32\\Wbem;C:\\WINDOWS\\System32\\WindowsPowerShell\\v1.0\\;C:\\WINDOWS\\System32\\OpenSSH\\;C:\\Program 
Files (x86)\\CodeMeter\\DevKit\\bin\\;C:\\Program Files 
(x86)\\CodeMeter\\Runtime\\bin\\;C:\\Program 
Files\\LLVM\\bin;C:\\Program Files\\doxygen\\bin;C:\\Program Files 
(x86)\\GitExtensions\\;C:\\Program Files\\nodejs\\;C:\\Program 
Files\\AMD\\AMDuProf\\bin;C:\\Program 
Files\\Docker\\Docker\\resources\\bin;C:\\Program 
Files\\CMake\\bin;C:\\Program Files\\Git\\cmd;C:\\Program 
Files\\Tailscale\\;C:\\Program Files\\RedHat\\Podman\\;C:\\Program 
Files\\PowerShell\\7\\;C:\\Users\\Eli\\AppData\\Local\\Programs\\Python\\Python311\\Scripts\\;C:\\Users\\Eli\\AppData\\Local\\Programs\\Python\\Python311\\;C:\\Program 
Files\\platform-tools;C:\\Users\\Eli\\.cargo\\bin;C:\\Users\\Eli\\AppData\\Local\\Microsoft\\WindowsApps;C:\\Users\\Eli\\Apps;C:\\Users\\Eli\\AppData\\Local\\Android\\Sdk\\platform-tools;C:\\gitlab_runner;C:\\ProgramData\\chocolatey\\lib\\deno;C:\\Users\\Eli\\AppData\\Roaming\\npm;C:\\Users\\Eli\\.dotnet\\tools;C:\\Users\\Eli\\AppData\\Local\\Programs\\Microsoft 
VS Code\\bin"

*When removing my code:*

QQmlApplicationEngine failed to load component
file:///C:/Code/cpp/qml-plugin-minimal/Main.qml:5:1: Cannot load library 
C:\Code\cpp\build_Hello_Debug\Hello\World\Worldplugin.dll: The specified 
module could not be found.
qml: Did not load any objects, exiting.


On 26/10/2023 15:14, Ulf Hermann via Development wrote:
>> I can confirm a simple:
>>
>>      for (const QString &importPath : parser.values(importOption)){
>>          QByteArray path = qgetenv("PATH");
>>          QByteArray newPath = importPath.toLocal8Bit() + ";";
>>          newPath += path;
>>          qputenv("PATH", newPath);
>>          qDebug() << "Modified PATH:" << qgetenv("PATH");
>>          e.addImportPath(importPath);
>>      }
>
> I don't quite understand why this works. Can you show the directory 
> layout in the respective import path? Where do the files end up?
>
> In any case, it should be specific to windows, so please add an 
> "#ifdef Q_OS_WIN". The best place to discuss this is actually the code 
> review system. You don't necessarily have to open a feature ticket.
>
> cheers,
> Ulf
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