WOW! How do I display a Byte Array in Image Control

[eclipxe]

I am receiving a Byte Array from an internet control - it is a Jpeg. How can I, instead of saving the jpeg to disk and then loading it in the Image control, just directly send the bytes to the image control?
Thanks
-Chris

[eclipxe]

?

[parksie]

Two choices:

1. Make a memory mapped file
2. Create a StdPicture object and shove the data into it.

[eclipxe]

which one is faster, and can you show me the code? thanks
-Chris

[parksie]

Either way, the problem is that you end up bypassing the built-in JPEG code. To use that, you pretty much HAVE to use a proper file. Although you can get the data in an image array, pass it to a separate JPEG decoder DLL, then display in the picturebox. A memory-mapped file is the faster of the two, but it's NASTY to pull off.

[eclipxe]

hmm, is there no way to send the image straight to the picture box from memory? (retaining all header info)

I am downloading this image over the Inet control - ?

[parksie]

I'm not sure what stage the JPEG data gets decoded at, so I can't say for sure how to get it in there. If it's possible to put JPEG data into a StdPicture, then it could be done that way, but I doubt it. Intel made a very easy-to-use JPEG decoder library, unfortunately it's for C, but I think a VB wrapper has been created for it.

[eclipxe]

I have the Jpeg encoder library - is there anyway to use a memory buffer to store the image? or how about DirectDraw/ BitBlt? I want to have up to 9 simultaneous images chnging.
-Chris

[DiGiTaIErRoR]

You could always download it to c:\windows\temp then when complete display and delete the file.

[eclipxe]

Only problem is writing the file to disk every 100 ms gets very time consuming, and cna't handle multiple threads without slowdown

[parksie]

If this program will only ever be used on your computer, you could set up a RAMDrive, which would stop the 10fps speed problems.