I'm not familiar enough with ctypes to know if that makes sense, but I
doubt it - nothing would seem to know the size of the buffer pointed at
by 'x'. You probably need to stick with using a python string object -
ensure the string contains exactly the bytes of the metafile.
Mark
On 25/03/2012 10:33 PM, shuwj wrote:
I believe a c_void_p is a ctypes construct which aren't supported by
pywin32. You need to convert it to a "normal" Python type. I'm
guessing it is binary data, so in py2k, you should be able to simply use
buffer(some_string_object). The error message seems to imply you may
even be able to use buffer(c_void_p_object), but I don't know how they
work well enough to suggest that will actually work.
Mark
Hi Mark,
Thanks for your reply. I use buffer() in GetImage method and there's no
exception now, but they don't work as expected.
-----------------------------------------
class wordaddin:
def GetImage(self,ctrl):
from gdiplus import LoadImage
i = LoadImage( 'c:/edit.png' )
i = buffer(i)
print i, 'ddd'
return i
-----------------------------------------
gdiplus.py is as following:
-----------------------------------------
#coding: gbk
from ctypes import *
from ctypes.wintypes import *
from comtypes import GUID
oleaut32 = windll.oleaut32
gdiplus = windll.gdiplus
class GdiplusStartupInput(Structure):
_fields_ = [
('GdiplusVersion', c_uint32),
('DebugEventCallback', c_void_p),
('SuppressBackgroundThread', BOOL),
('SuppressExternalCodecs', BOOL)
]
class GdiplusStartupOutput(Structure):
_fields = [
('NotificationHookProc', c_void_p),
('NotificationUnhookProc', c_void_p)
]
class PicDesc(Structure):
_fields_ = [
('Size', UINT),
('Type', UINT),
('hPic', HBITMAP),
('hPal', HPALETTE)
]
PICTYPE_BITMAP = 1
def LoadImage(filename):
'''Load an image from a file.
'''
#Initaialize GDI+
token = c_ulong()
startup_in = GdiplusStartupInput()
startup_in.GdiplusVersion = 1
startup_out = GdiplusStartupOutput()
u = gdiplus.GdiplusStartup( byref(token), byref(startup_in),
byref(startup_out))
fname = LPOLESTR( filename )
bitmap = c_void_p()
gdiImage = c_void_p()
x = LPVOID()
if u == 0:
print u
#Load the image
v = gdiplus.GdipCreateBitmapFromFile( fname, byref(gdiImage) )
if v == 0:
print v
#Create a bitmap handle from the GDI image
gdiplus.GdipCreateHBITMAPFromBitmap( gdiImage, byref(bitmap), 0 )
#Create the IPicture object from the bitmap handle
IID_IPicture = GUID('{7BF80980-BF32-101A-8BBB-00AA00300CAB}' )
picinfo = PicDesc( Type=PICTYPE_BITMAP, hPic=bitmap, hPal=0 )
picinfo.Size = picinfo.__sizeof__()
print oleaut32.OleCreatePictureIndirect( byref(picinfo),
byref(IID_IPicture), True, byref(x) )
gdiplus.GdipDisposeImage( gdiImage)
gdiplus.GdiplusShutdown( token )
return x
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