EZTwain problem with JPG

[DarrenWard]

I am using the above control and it is working but I cannot get it to create .JPG files only BitMap.

I have the .DLL required and when I issue a Twain_IsJPegAvailable it returns 1 (true).

If I issue the TWAIN_SetSaveFormat to 4 it acts as if it has created the file but it does not write anything to disk, even if I give it a null filename in the save routine it come up with the Save As dialogue box as documented but when you enter a filename it does not create the file, no error messages are being returned from the either the ocx or the dll.

Any ideas?

Dazz

GuiltyMaggot - The best rock band in the world!

 

[Mike Lewis]

Dazz,

Forgive me if this is obvious, but are you actually calling TWAIN_WriteNativeToFilename()? The TWAIN_SetSaveFormat() function doesn't actually save anything, it merely specifies the format for other functions.

Mike


Mike Lewis
Edinburgh, Scotland

http://www.ml-consult.demon.co.uk

 

[DarrenWard]

Hiya Mike,

Yeah I am;
TWAIN_SetSaveFormat(4)
PicHnwd = TWAIN_AcquireNative(0, 0)
TWAIN_WriteNativeToFilename(PicHwnd, "File.JPG&quot

but;
TWAIN_SetSaveFormat(2)
PicHnwd = TWAIN_AcquireNative(0, 0)
TWAIN_WriteNativeToFilename(PicHwnd, "File.BMP&quot

Works fine.


GuiltyMaggot - The best rock band in the world!

 

[Mike Lewis]

Dazz,

Your code looks OK to me. Have you tried testing the return value from TWAIN_SetSaveFormat()? It is supposed to return 0 if the format is unavailable.

Mike


Mike Lewis
Edinburgh, Scotland

http://www.ml-consult.demon.co.uk

 

[DarrenWard]

Mike,

It returns 1 as does the Twain_IsJPegAvailable call.

I have downloaded a fresh copy of JPeg DLL that is required with no joy, I will try an installation on another PC and see what happens, again thanks for your help so far.

Dazz

GuiltyMaggot - The best rock band in the world!

 

[Mike Lewis]

Dazz,

You might also try emailing Spike Maclarty, who is the author of EZTWAIN. I have found him very helpful. His email address is probably in the documentation somewhere, or on his web site.

Mike


Mike Lewis
Edinburgh, Scotland

http://www.ml-consult.demon.co.uk