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python - maya 独立与 pyside2

问题描述

当我想在 Maya 中独立添加 QtWidget 时，错误提示“QWidget：无法在没有 QApplication 的情况下创建 QWidget”。

from PySide2 import QtWidgets
import maya.standalone
maya.standalone.initialize()

QtWidgets.QPushButton()

maya.standalone.uninitialize()

然后我添加了一个 QApplication，错误说：“一个 QApplication 实例已经存在。”

from PySide2 import QtWidgets
import maya.standalone
import sys
maya.standalone.initialize()

QtWidgets.QApplication(sys.argv)
QtWidgets.QPushButton()

maya.standalone.uninitialize()

我使用QApplication.instance()我可以获得'QGuiApplication'参考，所以我知道maya.standalone（）将创建qApp，但如何创建QWidget（例如对话框......）

==================================================== ===============

from PySide2 import QtWidgets
import maya.standalone
maya.standalone.initialize()
print(QtWidgets.QApplication.instance())     
maya.standalone.uninitialize()

这是完整的日志：

pymel.core : INFO : Updating pymel with pre-loaded plugins: renderSetup
Warning: file: C:/Program Files/Autodesk/Maya2018/scripts/startup/initialStartup.mel line 179: Y-axis is already the Up-axis
Warning: file: C:\Users\a\Documents\maya\2018\prefs\filePathEditorRegistryPrefs.mel line 4: filePathEditor: Attribute 'aiImage.filename' is invalid or is not designated 'usedAsFilename'.
Warning: file: C:\Users\a\Documents\maya\2018\prefs\filePathEditorRegistryPrefs.mel line 5: filePathEditor: Attribute 'aiPhotometricLight.aiFilename' is invalid or is not designated 
'usedAsFilename'.
Warning: file: C:\Users\a\Documents\maya\2018\prefs\filePathEditorRegistryPrefs.mel line 6: filePathEditor: Attribute 'aiStandIn.dso' is invalid or is not designated 'usedAsFilename'.
Warning: file: C:\Users\a\Documents\maya\2018\prefs\filePathEditorRegistryPrefs.mel line 7: filePathEditor: Attribute 'aiVolume.filename' is invalid or is not designated 'usedAsFilename'.
AbcExport v1.0 using Alembic 1.7.5 (built Feb  6 2018 18:28:08)
Initialized VP2.0 renderer {
  Version : 2016.11.40.12. Feature Level 5.
  Adapter : GeForce RTX 3090/PCIe/SSE2
  Vendor ID: 4318. Device ID : 8708
  Driver : .
  API : OpenGL V.4.6.
  Max texture size : 16384 * 16384.
  Max tex coords : 32
  Shader versions supported (Vertex: 5, Geometry: 5, Pixel 5).
  Shader compiler profile : (Best card profile)
  Active stereo support available : 0
  GPU Memory Limit : 24576 MB.
  CPU Memory Limit: 62178.5 MB.
  MultiDraw consolidation: enabled
}
OpenCL evaluator is attempting to initialize OpenCL.
Detected 1 OpenCL Platforms: 
 0: NVIDIA Corporation. NVIDIA CUDA. OpenCL 1.2 CUDA 11.2.162.
 Supported extensions: cl_khr_global_int32_base_atomics cl_khr_global_int32_extended_atomics cl_khr_local_int32_base_atomics cl_khr_local_int32_extended_atomics cl_khr_fp64 cl_khr_byte_addressable_store cl_khr_icd cl_khr_gl_sharing cl_nv_compiler_options cl_nv_device_attribute_query cl_nv_pragma_unroll cl_nv_d3d10_sharing cl_khr_d3d10_sharing cl_nv_d3d11_sharing cl_nv_copy_opts cl_nv_create_buffer cl_khr_int64_base_atomics cl_khr_int64_extended_atomics cl_khr_device_uuid
OpenCL evaluator choosing OpenCL platform NVIDIA Corporation.
OpenCL evaluator is unable to find a GPU device that can share VBOs with OpenGL.
Warning: file: C:/Program Files/Autodesk/Maya2018/scripts/startup/autoLoadPlugin.mel line 35: Loading plug-in "lookdevKit" has resulted in changes to the scene that may need to be saved.
AbcImport v1.0 using Alembic 1.7.5 (built Feb  6 2018 18:28:08)

<PySide2.QtGui.QGuiApplication object at 0x000001828E9D9108>

标签： pythonqtmayapyside2

解决方案

initialize()如果没有先前的 QXApplication，该函数会创建一个 QGuiApplication，因此一种可能的方法是在调用该函数之前创建一个 QApplication：

app = QtWidgets.QApplication(sys.argv)
maya.standalone.initialize()

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