Is there any known problem using GDTWAIN with Vista ?

[tim]

We appear to have GDTWAIN running properly to capture pictures from a webcam within a form in Visual FoxPro 8. We have tested this successfully on three different machine using XPPro and XPHome. We can not get it to work on another machine that is on Vista Business.
We had trouble registering the .OCX in the run command and eventually appeared to succeed by using the DOS command line, but the button in the form that works under XP does nothing at all in Vista.

[Loïc]

HI,

To give an answer to post title: No. GdTwain is developed , tested and used for internal production under windows Vista (like all other GdPicture components).

We had trouble registering the .OCX in the run command and eventually appeared to succeed by using the DOS command line

Which trouble ?

but the button in the form that works under XP does nothing at all in Vista

Do you have more information ? IE: a code snippet & a report of the returned values & behaviour of the called methods.

Best regards,

Loïc

[tim]

Thanks for the reply.

The error message was 0x80004005. We tried various web searches and tools to deal with this but were not succesful. We appeared to get it to register properly via the command line instead of the run command, but have no way of telling if it really worked or not.

Code snippet (working fine in XP Pro and Home with different machine types and different camera types) :

aaa = CREATEOBJECT("gdtwain2.twain")
aaa.TwainSetHideUI(.F.)
aaa.SetLicenseNumber("XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX")
aaa.TwainAcquireToGdPictureImage
aaa.SaveAsJPEG("AUTO"+ALLTRIM(STR(Cust.CustNo))+".jpg")

............where Cust.CustNo is the control number for that particular record.

[Loïc]

HI,

The error message was 0x80004005. We tried various web searches and tools to deal with this but were not succesful

The answer is here: http://www.gdpicture.com/faq.php#G9


For your code snippet I need also returned values & behaviour of each called methods. Else I can't help you more.


Loïc


PS: I removed your license key from your code snippet. Please try to don't write it again on the forum.

[tim]

We did not manage to solve this problem when we posted it originally so I am now revisting it. I have taken a brand new machine running Vista, copied MSVBVM60.dll, GDTWAIN.dll and GDTWAIN2.OCX into the Window\system32 directory. I have registered GDTWAIN.OCX using REGSVR32 as per the manual and it gave me a message that it had registered correctly.
I then took the working software we have developed from an XP machine and copied it, together with its data files, onto the Vista machine.
I connected a new Logitech WebCam, it set itself up and is working properly within its own window.
When I click on the TAKE PICTURE button on our form (which works perfectly in XP,) nothing happens at all. There is no result and no error message.

The entire code fro the button is below (licence number blanked out here)

aaa = CREATEOBJECT("gdtwain2.twain")
aaa.TwainSetHideUI(.F.)
aaa.SetLicenseNumber("*************************")
aaa.TwainAcquireToGdPictureImage
aaa.SaveAsJPEG("AUTO"+ALLTRIM(STR(Cust.CustNo))+".jpg")
Replace Cust.Photo WITH 'AUTO'
ThisForm.Refresh

[tim]

I have been researching this further and have found some interesting information on another website.
For Vista, we do of course have to use newer drivers than on XP.
It seems that Logitech no longer support the TWAIN standard, in which case the problem would appear to be GDTWAIN itself rather than Vista. Most of the WebCams out there seem to be Logitech so it seems that we need to go back to the drawing board and find an alternative piece of software that uses an image capture system that is still supported.
I would welcome your input on this, am I understanding this correctly ?
If so, do you have (or know of) a suitable product ?

[Loïc]

Hi Tim,

Again I need that:

For your code snippet I need also returned values & behaviour of each called methods. Else I can't help you more.

I suppose that your problem is simple: You don't have a TWAIN driver for your device. But I can give you a definitive answer only if you give me answer to my questions.

Best regards,

Loïc