Using image data read out from a file
Hi,
Having used the GetBitmapFromFileEx(), GetBitmapInfoEx() to acquire the necessary image data (most of them is the .png format), then using the FileToArray() to put the image data in my own binary file, e.g., "mypicture.dat". My idea is that whenever need to use the image, I can read out it from mypicture.dat and then display it on a pcture control. But when loading the image data to the memory, I have no idea to map the image data buffer to an image resource, which can let to acquire a bitmap ID. Because from the cvi's image processing function lists, it seems that must through such as the GetBitmapFromFileEx(), GetBitmapFromFile() to acquire the image data buffer and the bitmap ID, then using SetCtrlBitmap() to diplay it. Is there any way to resolve the problem? Thanks.
David
Well, to read and write raw data file informations from a PNG image you must adhere to this standard. As a source of informations you may take a look to this Wikipedia page and to the links in this page from the PNG Home site.
So the problem is: does your application worth the effort to study this documentation?
Edit: FYI part of this job has been already made in CVI by Guillaume Dargaud for his ReadSavePNG instrument driver. It's been a long time since I have used this instrument, as I/O operations on PNG files have been integrated into CVI since release 8 and support for JPEG files in release 7 or so. Nevertheless I saw functions in that instrument for accessing raw data in a PNG file so you may find them useful for your needs.
Proud to use LW/CVI from 3.1 on.
My contributions to the Developer Zone Community
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SQL*Loader: Release 10.2.0.1.0 - Production on Mon May 31 09:45:10 2010
Copyright (c) 1982, 2005, Oracle. All rights reserved.
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C:\>
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