Re: Converting a PIL image object to a buffer
En Wed, 01 Apr 2009 19:20:43 -0300, Simon Hibbs simon.hi...@gmail.com escribió: On 1 Apr, 21:43, Gary Herron gher...@islandtraining.com wrote: Simon Hibbs wrote: I'm trying to dump a snapshot of my application window to the clipboard. I can use ImageGrab in PIL to get the screen data into a PIL image object, which i have converted to a bitmap using ImageWin, but when I try to pass this to the clipboard using - win32clipboard.SetClipboardData(win32clipboard.CF_BITMAP, img) It fails, telling be that The object must support the buffer interface. The second argument to SetClipboardData should be a handle to a bitmap resource, not a string. See win32\test\test_clipboard.py for an example. PS: Hmm, looking at SetClipboardData, seems that a string containing the data in the right format *might* work too. But it's easier to use LoadImage than building the resource by hand, I think. -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Re: Converting a PIL image object to a buffer
Simon Hibbs schrieb: On 1 Apr, 21:43, Gary Herron gher...@islandtraining.com wrote: Simon Hibbs wrote: I'm trying to dump a snapshot of my application window to the clipboard. I can use ImageGrab in PIL to get the screen data into a PIL image object, which i have converted to a bitmap using ImageWin, but when I try to pass this to the clipboard using - win32clipboard.SetClipboardData(win32clipboard.CF_BITMAP, img) It fails, telling be that The object must support the buffer interface. How can I convert a PIL image into a buffer object? I can't find any clues. PIL images have a tostring method that returns a string containing all the pixel data. Would that help you to either create the needed buffer? Or perhaps you could by-pass the need for a buffer, and just use the byte string. If I use tostring I get a string which I can put on the clipboard, but it isn't any kind of image. I can make a PIL image from the string but them I'm back to square one again. Did you actually try that? Strings support the buffer interface, and the type of the binary data you set should be defined by the first argument. Alternatively (if the string is not of the proper format), maybe storing the image to a (c)StringIO-object as BMP and retrieving it's value would help. However, I think your concerns about wasting memory when using a file are moot - creating an extra memory buffer isn't less memory consuming, and if the file is living only a few seconds it might not even actually hit the disk at all. In the end, the important thing is the working clipboard. Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: Converting a PIL image object to a buffer
On 2 Apr, 08:28, Diez B. Roggisch de...@nospam.web.de wrote: Simon Hibbs schrieb: On 1 Apr, 21:43, Gary Herron gher...@islandtraining.com wrote: Simon Hibbs wrote: I'm trying to dump a snapshot of my application window to the clipboard. I can use ImageGrab in PIL to get the screen data into a PIL image object, which i have converted to a bitmap using ImageWin, but when I try to pass this to the clipboard using - win32clipboard.SetClipboardData(win32clipboard.CF_BITMAP, img) It fails, telling be that The object must support the buffer interface. How can I convert a PIL image into a buffer object? I can't find any clues. PIL images have a tostring method that returns a string containing all the pixel data. Would that help you to either create the needed buffer? Or perhaps you could by-pass the need for a buffer, and just use the byte string. If I use tostring I get a string which I can put on the clipboard, but it isn't any kind of image. I can make a PIL image from the string but them I'm back to square one again. Did you actually try that? Strings support the buffer interface, and the type of the binary data you set should be defined by the first argument. Alternatively (if the string is not of the proper format), maybe storing the image to a (c)StringIO-object as BMP and retrieving it's value would help. However, I think your concerns about wasting memory when using a file are moot - creating an extra memory buffer isn't less memory consuming, and if the file is living only a few seconds it might not even actually hit the disk at all. In the end, the important thing is the working clipboard. Yes I did try this, the code to dump the sting version to the clipboard worked, but pasting it back out wasn't possible although I could print them to the console. I don't mean wasting memory, just that actualy hitting the file system and creating a file seems as though it shouldn't be necessery. Is there any good reason why you can't just create an empty buffer object or file object directly? It seems like an unecessery restriction, unless there's some underlying reason such as that it's hard to implement in c, which seems implausible. Sorry, that's a rhetorical question. I've not had a chance to work on this today, if I find an elegant way round it I'll post the results for future googling. Simon Hibbs -- http://mail.python.org/mailman/listinfo/python-list
Converting a PIL image object to a buffer
I'm trying to dump a snapshot of my application window to the clipboard. I can use ImageGrab in PIL to get the screen data into a PIL image object, which i have converted to a bitmap using ImageWin, but when I try to pass this to the clipboard using - win32clipboard.SetClipboardData(win32clipboard.CF_BITMAP, img) It fails, telling be that The object must support the buffer interface. How can I convert a PIL image into a buffer object? I can't find any clues. Help appreciated, Simon Hibbs -- http://mail.python.org/mailman/listinfo/python-list
Re: Converting a PIL image object to a buffer
Simon Hibbs wrote: I'm trying to dump a snapshot of my application window to the clipboard. I can use ImageGrab in PIL to get the screen data into a PIL image object, which i have converted to a bitmap using ImageWin, but when I try to pass this to the clipboard using - win32clipboard.SetClipboardData(win32clipboard.CF_BITMAP, img) It fails, telling be that The object must support the buffer interface. How can I convert a PIL image into a buffer object? I can't find any clues. PIL images have a tostring method that returns a string containing all the pixel data. Would that help you to either create the needed buffer? Or perhaps you could by-pass the need for a buffer, and just use the byte string. Gary Herron Help appreciated, Simon Hibbs -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: Converting a PIL image object to a buffer
On 1 Apr, 21:43, Gary Herron gher...@islandtraining.com wrote: Simon Hibbs wrote: I'm trying to dump a snapshot of my application window to the clipboard. I can use ImageGrab in PIL to get the screen data into a PIL image object, which i have converted to a bitmap using ImageWin, but when I try to pass this to the clipboard using - win32clipboard.SetClipboardData(win32clipboard.CF_BITMAP, img) It fails, telling be that The object must support the buffer interface. How can I convert a PIL image into a buffer object? I can't find any clues. PIL images have a tostring method that returns a string containing all the pixel data. Would that help you to either create the needed buffer? Or perhaps you could by-pass the need for a buffer, and just use the byte string. If I use tostring I get a string which I can put on the clipboard, but it isn't any kind of image. I can make a PIL image from the string but them I'm back to square one again. I suppse I could save the image object to a real file and then send that to the clipboard, but that seems wasteful and I'd have to worry about what to call it and where to put it. Much neater if I could just create it in memory somehow. Simon Hibbs -- http://mail.python.org/mailman/listinfo/python-list
