unable to import pyside2 "DLL load failed while importing shiboken2 "?

**eue** · 10th February 2025, 03:42

my python script failed when script tries to import PySide2 with the CPython function I wrote. It gives the following error:

Qt Code:

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Error while importing pyside2:
Traceback (most recent call last):
  File "C:/Users/Administrator/Desktop/python-mini-projects-master/projects/Ascii_art/make_art_test.py", line 48, in <module>
    import PySide2 
  File "E:\VS_ProJectS\msdiBIMPlatform-0.3\ThirdParty\tool\python\lib\site-packages\PySide2\__init__.py", line 80, in <module>
    _setupQtDirectories()
  File "E:\VS_ProJectS\msdiBIMPlatform-0.3\ThirdParty\tool\python\lib\site-packages\PySide2\__init__.py", line 31, in _setupQtDirectories
    import shiboken2
  File "E:\VS_ProJectS\msdiBIMPlatform-0.3\ThirdParty\tool\python\lib\site-packages\shiboken2\__init__.py", line 27, in <module>
    from .shiboken2 import *
ImportError: DLL load failed while importing shiboken2: unable to find module

Error while importing pyside2:
Traceback (most recent call last):
  File "C:/Users/Administrator/Desktop/python-mini-projects-master/projects/Ascii_art/make_art_test.py", line 48, in <module>
    import PySide2 
  File "E:\VS_ProJectS\msdiBIMPlatform-0.3\ThirdParty\tool\python\lib\site-packages\PySide2\__init__.py", line 80, in <module>
    _setupQtDirectories()
  File "E:\VS_ProJectS\msdiBIMPlatform-0.3\ThirdParty\tool\python\lib\site-packages\PySide2\__init__.py", line 31, in _setupQtDirectories
    import shiboken2
  File "E:\VS_ProJectS\msdiBIMPlatform-0.3\ThirdParty\tool\python\lib\site-packages\shiboken2\__init__.py", line 27, in <module>
    from .shiboken2 import *
ImportError: DLL load failed while importing shiboken2: unable to find module

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Here is my CPython function I use to run my script

Qt Code:

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void RunPythonScript(std::string python_module_or_script, std::string working_path)
{
	if (!StartInterpreter())
	{
		_interpreterStatus = ShutDown;
		throw Base::RuntimeError("Initialization Failed");
	}
	_interpreterStatus = Running;
 
	// Set the locale to UTF-8 (necessary for mbstowcs to handle UTF-8 correctly)
	std::setlocale(LC_ALL, "en_US.UTF-8");
 
	// Allocate buffer for wide string conversion
	size_t len = std::mbstowcs(nullptr, python_module_or_script.c_str(), 0) + 1;  // Get the length of the wide string
	wchar_t* wide_str = new wchar_t[len];  // Allocate memory for wide string
 
	std::mbstowcs(wide_str, python_module_or_script.c_str(), len);  // Convert char* to wchar_t*
 
	FILE* fp = _Py_wfopen(wide_str, L"r");
	if (fp != nullptr) {
		PyRun_SimpleString("import sys");
		//PyRun_SimpleString("sys.setdefaultencoding('utf-8')");
		PyRun_SimpleString(msdiBIMPlatformBaseModule().c_str());
 
		PyObject* pModule;
		pModule = PyImport_AddModule("__main__");
		if (pModule == NULL)
		{
			cout << "__main__ ??" << endl;
			PyErr_Print();
			return;
		}
		//pDict = PyModule_GetDict(pModule);
		//AdditionalmsdiBIMPlatformModule(pModule);
		std::set<std::string> namesBefore = GetObjectsName();
		int res = PyRun_SimpleFile(fp, python_module_or_script.c_str());
		std::set<std::string> namesAfter = GetObjectsName();
		SetCreatePos(namesAfter, namesBefore, python_module_or_script);
 
		if (res != 0) {
			std::cout << "Run Script Failed" << res << std::endl;
			PyErr_Print();
		}
		std::fclose(fp);
	}
	else {
		std::cerr << "Failed to open file: " << python_module_or_script << std::endl;
	}
 
	EndInterpreter();
}

void RunPythonScript(std::string python_module_or_script, std::string working_path)
{
	if (!StartInterpreter())
	{
		_interpreterStatus = ShutDown;
		throw Base::RuntimeError("Initialization Failed");
	}
	_interpreterStatus = Running;

	// Set the locale to UTF-8 (necessary for mbstowcs to handle UTF-8 correctly)
	std::setlocale(LC_ALL, "en_US.UTF-8");

	// Allocate buffer for wide string conversion
	size_t len = std::mbstowcs(nullptr, python_module_or_script.c_str(), 0) + 1;  // Get the length of the wide string
	wchar_t* wide_str = new wchar_t[len];  // Allocate memory for wide string

	std::mbstowcs(wide_str, python_module_or_script.c_str(), len);  // Convert char* to wchar_t*

	FILE* fp = _Py_wfopen(wide_str, L"r");
	if (fp != nullptr) {
		PyRun_SimpleString("import sys");
		//PyRun_SimpleString("sys.setdefaultencoding('utf-8')");
		PyRun_SimpleString(msdiBIMPlatformBaseModule().c_str());

		PyObject* pModule;
		pModule = PyImport_AddModule("__main__");
		if (pModule == NULL)
		{
			cout << "__main__ ??" << endl;
			PyErr_Print();
			return;
		}
		//pDict = PyModule_GetDict(pModule);
		//AdditionalmsdiBIMPlatformModule(pModule);
		std::set<std::string> namesBefore = GetObjectsName();
		int res = PyRun_SimpleFile(fp, python_module_or_script.c_str());
		std::set<std::string> namesAfter = GetObjectsName();
		SetCreatePos(namesAfter, namesBefore, python_module_or_script);

		if (res != 0) {
			std::cout << "Run Script Failed" << res << std::endl;
			PyErr_Print();
		}
		std::fclose(fp);
	}
	else {
		std::cerr << "Failed to open file: " << python_module_or_script << std::endl;
	}

	EndInterpreter();
}

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Here is my python script, which is a simple attempt to import PySide2

Qt Code:

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try:
        import PySide2  # Or any other module you are trying to load
    except Exception as e:
        print("Error while importing pyside2:")
        traceback.print_exc()  # This will print the traceback of the error

try:
        import PySide2  # Or any other module you are trying to load
    except Exception as e:
        print("Error while importing pyside2:")
        traceback.print_exc()  # This will print the traceback of the error

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I am working under environment:
1. python 3.8.20
2. Qt 5.15.2
3. Pyside 5.15.8 and shiboken2 that comes along with pyside2 installation

I could import PySide2 just fine within python interpreter, no problem with a stand alone simple CPython program with SAME MSVC project configuration to run script.
BUT fails when running the current CPython program I have been working on for long time. Unable to find the reason for this.
Is there anyway to check? Maybe I overlooked any hidden MSVC configuration? Or maybe there is something code missing that blocks the correct search for dlls and correct import?

**d_stranz** · 10th February 2025, 18:24

The runtime environment in Visual Studio is usually not the same as your normal command line / desktop Windows environment. Make sure your PATH includes the location of this DLL before starting Visual Studio. Also, in your Project configuration (Project -> Properties -> Debugging), make sure the Environment PATH entry there also include the DLL directory.