[pywin32-bugs] [ pywin32-Bugs-1944375 ] PyRegEnumValue fails on i18n systems

[SourceForge.net <no...@so...>]

Bugs item #1944375, was opened at 2008-04-17 07:11
Message generated for change (Comment added) made by mhammond
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=551954&aid=1944375&group_id=78018

Please note that this message will contain a full copy of the comment thread,
including the initial issue submission, for this request,
not just the latest update.
Category: win32
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Christopher Nelson (neverjade)
Assigned to: Nobody/Anonymous (nobody)
Summary: PyRegEnumValue fails on i18n systems

Initial Comment:
If you try to enumerate the contents of the registry key:

"SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Control Panel\\Cursors\\Schemes"

pywin32 will fail with a (234, "PyRegEnumValue", ""), which means that RegEnumValue returned with ERROR_MORE_DATA.

The method pywin32 currently uses to detect the size of the value name buffer does not work properly on Windows  2003 X64 Japanese.  

To fix this bug you must make the code look like the follwing:

// @pymethod (string,object,type)|win32api|RegEnumValue|Enumerates values of the specified open registry key. The function retrieves the name of one subkey each time it is called.

static PyObject *

PyRegEnumValue( PyObject *self, PyObject *args )

{

	// This value is taken from MSDN docs.

	const DWORD maxValueNameSize=16384;



	HKEY hKey;

	PyObject *obKey;

	int index;

	long rc;

	TCHAR retValueBuf[maxValueNameSize];

	BYTE *retDataBuf;

	DWORD retValueSize = maxValueNameSize;

	DWORD retDataSize=0;

	DWORD typ;

	

	// @pyparm <o PyHKEY>/int|key||An already open key, or any one of the following win32con constants:<nl>HKEY_CLASSES_ROOT<nl>HKEY_CURRENT_USER<nl>HKEY_LOCAL_MACHINE<nl>HKEY_USERS

	// @pyparm int|index||The index of the key to retrieve.



	if (!PyArg_ParseTuple(args, "Oi:PyRegEnumValue", &obKey, &index))

		return NULL;

	if (!PyWinObject_AsHKEY(obKey, &hKey))

		return NULL;

	

	// @pyseeapi PyRegEnumValue

	PyW32_BEGIN_ALLOW_THREADS

	rc=RegEnumValue(hKey, index, retValueBuf, &retValueSize, NULL, &typ, NULL, &retDataSize);

	PyW32_END_ALLOW_THREADS

		

	// Reset because the call above messed it up.

	retValueSize=maxValueNameSize;

	// Don't need to increment because the size returned from RegEnumValue includes any needed terminators.

	retDataBuf= (BYTE * )alloca(retDataSize);

	if ((retDataBuf==NULL)){

		PyErr_NoMemory();

		return NULL;

		}

	

	rc=RegEnumValue(hKey, index, retValueBuf, &retValueSize, NULL, &typ, retDataBuf, &retDataSize);	 



	if (rc!=ERROR_SUCCESS)

	{		

		return ReturnAPIError("PyRegEnumValue", rc);

	}



	PyObject *obData=PyWinObject_FromRegistryValue(retDataBuf, retDataSize, typ);

	if (obData==NULL)

	{

		return NULL;

	}

	PyObject *retVal = Py_BuildValue("NOi", PyWinObject_FromTCHAR(retValueBuf), obData, typ);

	

	Py_DECREF(obData);

	

	return retVal;

	// @comm This function is typically called repeatedly, until an exception is raised, indicating no more values.

}

----------------------------------------------------------------------

>Comment By: Mark Hammond (mhammond)
Date: 2008-05-04 21:07

Message:
Logged In: YES 
user_id=14198
Originator: NO

Could you please attach either a patch, or the complete source file with
the new function (all the indentation is lost above)

Thanks.

----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=551954&aid=1944375&group_id=78018