使用 docx 到 pdf 转换时，当我在 IIS 上运行我的烧瓶代码时出现 COM 问题

Question

我有一个 Flask 应用程序，其中包含创建 docx 文档然后将其转换为 pdf 的功能，当我在本地计算机上运行代码时一切正常并且创建了 pdf 文档但是当我在部署计算机上的 IIS 上托管应用程序时使用 fastcgi 模块，它工作正常并创建 docx 文档但由于错误而没有创建 pdf 文档，这里是创建 docx 文档并使用 docx2pdf 库转换为 pdf 的函数：

def CreateApplication(file,replacements,serialnum):

    document=Document(file)
    for para in document.paragraphs:
        # Iterate through the runs in the paragraph
        for run in para.runs:
            # Check if the run text is a keyword in the replacements dictionary
            if run.text in replacements:
                # Replace the keyword with the replacement and maintain the style
                run.text = replacements[run.text]
    for table in document.tables:
        for row in table.rows:
            for cell in row.cells:
                for paragraph in cell.paragraphs:
                    for run in paragraph.runs:
                        for keyword, value in replacements.items():
                            if keyword in run.text:
                                # Replace the keyword with the value
                                run.text = run.text.replace(keyword, value)
    document.save(f'files/{serialnum}/MainFiles/Application{serialnum}.docx')
    docx_output_path=f'files/{serialnum}/MainFiles/Application{serialnum}.docx'
    pdf_input_path = docx_output_path
    
    # Specify the path of the output .pdf file
    pdf_output_path = os.path.splitext(pdf_input_path)[0] + '.pdf'
    
    # Convert the .docx file to .pdf
    convert(pdf_input_path, pdf_output_path)

这是我在烧瓶中的称呼：

@app.route('/submitapplication/<serialnumber>',methods=['POST','GET'])
def submit(serialnumber):
    st = time.time()
    print('iam in')
    datacoming=request.get_json()
    print(datacoming)
    project_describtion=json.loads(datacoming)
    project_describtion['Statue_of_Project']='Application pending'
    current_date = datetime.now()
    formatted_date = current_date.strftime("%Y-%m-%d")
    project_describtion['DateofApplication'] = formatted_date
    print(project_describtion)
    pidata = Search_in_Company(session['user'], session['password'], session['serverip'], session['companyid'])
    project_describtion.update(pidata)
    '''
    write sql code to upload this dictionary to its specified rows
    '''
    project_describtion['Project_Serial_Number']=serialnumber
    #CreateApplication('LPG application General.docx',project_describtion,serialnumber)

    #trying threading to run conversion in another thread
    Application=threading.Thread(target=CreateApplication,args=('LPG application General.docx',project_describtion,serialnumber))
    Application.start()


    # get the execution time


    Update_case(session['user'],session['password'],session['serverip'],session['currentserial'],session['companyid'],project_describtion)
    et = time.time()
    elapsed_time = et - st
    print('Execution time:', elapsed_time, 'seconds')
    return jsonify({'url': url_for('home')})

这是我尝试 comtypes.client 库时出现的错误，当我使用 docx2pdf 库时出现类似的错误：

Exception on /submitapplication/JO-2023JL030039 [POST]
Traceback (most recent call last):
  File "C:\Python\python311\Lib\site-packages\flask\app.py", line 2525, in wsgi_app
    response = self.full_dispatch_request()
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Python\python311\Lib\site-packages\flask\app.py", line 1822, in full_dispatch_request
    rv = self.handle_user_exception(e)
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Python\python311\Lib\site-packages\flask\app.py", line 1820, in full_dispatch_request
    rv = self.dispatch_request()
         ^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Python\python311\Lib\site-packages\flask\app.py", line 1796, in dispatch_request
    return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\inetpub\wwwroot\flpgproj\main.py", line 404, in submit
    CreateApplication('LPG application General.docx',project_describtion,serialnumber)
  File "C:\inetpub\wwwroot\flpgproj\CreateFiles.py", line 136, in CreateApplication
    convert_to_pdf(pdf_input_path, pdf_output_path)
  File "C:\inetpub\wwwroot\flpgproj\CreateFiles.py", line 35, in convert_to_pdf
    word=comtypes.client.CreateObject('Word.Application')
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Python\python311\Lib\site-packages\comtypes\client\__init__.py", line 215, in CreateObject
    obj = comtypes.CoCreateInstance(clsid, clsctx=clsctx, interface=interface)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Python\python311\Lib\site-packages\comtypes\__init__.py", line 1264, in CoCreateInstance
    _ole32.CoCreateInstance(byref(clsid), punkouter, clsctx, byref(iid), byref(p))
  File "_ctypes/callproc.c", line 1000, in GetResult
OSError: [WinError -2146959355] Server execution failed

这里是我使用 docx2pdf 库时出现的完全相同的错误，请注意我将 word 和 pdf 的所有必需权限授予 defaultapplicationpool 和 iis_iusr：

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Python\python311\Lib\site-packages\flask\app.py", line 2525, in wsgi_app
    response = self.full_dispatch_request()
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Python\python311\Lib\site-packages\flask\app.py", line 1822, in full_dispatch_request
    rv = self.handle_user_exception(e)
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Python\python311\Lib\site-packages\flask\app.py", line 1820, in full_dispatch_request
    rv = self.dispatch_request()
         ^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Python\python311\Lib\site-packages\flask\app.py", line 1796, in dispatch_request
    return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\inetpub\wwwroot\flpgproj\main.py", line 404, in submit
    CreateApplication('LPG application General.docx',project_describtion,serialnumber)
  File "C:\inetpub\wwwroot\flpgproj\CreateFiles.py", line 136, in CreateApplication
    convert(pdf_input_path, pdf_output_path)
  File "C:\Python\python311\Lib\site-packages\docx2pdf\__init__.py", line 106, in convert
    return windows(paths, keep_active)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Python\python311\Lib\site-packages\docx2pdf\__init__.py", line 19, in windows
    word = win32com.client.Dispatch("Word.Application")
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Python\python311\Lib\site-packages\win32com\client\__init__.py", line 117, in Dispatch
    dispatch, userName = dynamic._GetGoodDispatchAndUserName(dispatch, userName, clsctx)
                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Python\python311\Lib\site-packages\win32com\client\dynamic.py", line 106, in _GetGoodDispatchAndUserName
    return (_GetGoodDispatch(IDispatch, clsctx), userName)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Python\python311\Lib\site-packages\win32com\client\dynamic.py", line 88, in _GetGoodDispatch
    IDispatch = pythoncom.CoCreateInstance(
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^
pywintypes.com_error: (-2146959355, 'Server execution failed', None, None)