Python、comtypes 和 ArcObjects : Error creating AppROT object

Question

我正在 Python 2.6.5 和 ArcGIS 10 SP1 下试验 comtypes 和 ArcObjects。我使用纯 Python 方法来包装 this answer 中描述的 ArcObjects OLB。 ，但在 comtypes.CoCreateInstance 方法中出现错误。

这是我正在运行的代码:

def WrapModules():
    #force wrapping of all ArcObjects libraries (OLBs)
    import os
    import comtypes.client
    # change com_dir to whatever it is for you
    com_dir = r'C:\Program Files\ArcGIS\Desktop10.0\com'
    coms = [os.path.join(com_dir, x) for x in os.listdir(com_dir) if os.path.splitext(x)[1].upper() == '.OLB']
    map(comtypes.client.GetModule, coms)

def GetApp():
    """Get a hook into the current session of ArcMap"""
    from comtypes.gen import esriFramework
    pAppROT = NewObj(esriFramework.AppROT, esriFramework.IAppROT)
    if pAppROT is not None:
        iCount = pAppROT.Count
        if iCount == 0:
            print 'No ArcGIS application currently running.  Terminating ...'
            return None
        for i in range(iCount):
            pApp = pAppROT.Item(i)  #returns IApplication on AppRef
            if pApp.Name == 'ArcMap':
                print "ArcMap found"
                return pApp
        print 'No ArcMap session is running at this time.'
    print "No AppROT found"
    return None

def NewObj(MyClass, MyInterface):
    """Creates a new comtypes POINTER object where\n\
    MyClass is the class to be instantiated,\n\
    MyInterface is the interface to be assigned"""
    from comtypes.client import CreateObject
    import traceback
    try:
        ptr = CreateObject(MyClass, interface=MyInterface)
        return ptr
    except:
        print traceback.format_exc()
        return None

if __name__ == "__main__":
    WrapModules()
    pApp = GetApp()
    if pApp is not None:
        print "HWND: %d" % pApp.hWnd
    else:
        print "No ArcGIS application found!"

这是脚本的输出:

Traceback (most recent call last):  File "C:\temp\ComHelpers.py", line 35, in NewObj    ptr = CreateObject(MyClass, interface=MyInterface)  File "C:\Python26\ArcGIS10.0\lib\site-packages\comtypes\client\__init__.py", line 235, in CreateObject    obj = comtypes.CoCreateInstance(clsid, clsctx=clsctx, interface=interface)  File "C:\Python26\ArcGIS10.0\lib\site-packages\comtypes\__init__.py", line 1145, in CoCreateInstance    _ole32.CoCreateInstance(byref(clsid), punkouter, clsctx, byref(iid), byref(p))  File "_ctypes/callproc.c", line 925, in GetResultWindowsError: [Error -2147221231] ClassFactory cannot supply requested classNo AppROT foundNo ArcGIS application found!

感谢您提供的任何见解!

Answer 1

为了完整起见，this solution由 Jason Scheirer 在 GIS Stack Exchange 上发布:

Import arcpy first, you aren't doing any license checkout or setting up the ArcObjects 10.0 runtime as-is so it won't find the CoClass.