r wrote:
> more *maybe useful dump?
>
>>>> for i in dev.Items:
> for p in i.Properties:
> if not p.IsReadOnly:
> print p.Name, '->', p.Value
>
. . .
> Horizontal Resolution -> 200
> Vertical Resolution -> 200
> Horizontal Start Position -> 0
. . .
>
> Now how to set the values... hmmm?
>
How to set the values? This is THE magic question.
At least I found out how to set the values in C# :
foreach (Property prop in item.Properties){
if (prop.IsReadOnly) continue;
if (prop.Name == "Horizontal Resolution")
{
IProperty iprop = (IProperty)prop;
Object val = 75;
iprop.set_Value(ref val);
}
}
Below my most recent complete script:
(still not able to set params, though I can with C#)
import win32com.client, os
WIA_COM = "WIA.CommonDialog"
WIA_IMG_FORMAT_PNG = "{B96B3CAF-0728-11D3-9D7B-0000F81EF32E}"
WIA_COMMAND_TAKE_PICTURE="{AF933CAC-ACAD-11D2-A093-00C04F72DC3C}"
def takePictureOrNot(dev): # cameras have to call TakePicture
for command in dev.Commands:
if command.CommandID==WIA_COMMAND_TAKE_PICTURE:
print "take PICK"
foo=dev.ExecuteCommand(WIA_COMMAND_TAKE_PICTURE)
def setImgProps(item): # here scan properties should be set
for prop in item.Properties:
if prop.IsReadOnly: continue
if(prop.Name == "Horizontal Resolution"):
res = 250
print "trying to set",prop.Name,prop,"to ",res
### unfortunately the next line (if uncommented) fails
#prop.set_Value(res)
def transferImg(dev): # set properties and scan image
i=1
image = None
for item in dev.Items:
if i==dev.Items.Count:
setImgProps(item)
image=item.Transfer(WIA_IMG_FORMAT_PNG)
break
i=i+1
return image
def scan_image_wia():
wia = win32com.client.Dispatch(WIA_COM) # CommonDialog object
dev = wia.ShowSelectDevice()
takePictureOrNot(dev)
image = transferImg(dev)
return image
image = scan_image_wia()
fname = 'wia-test.jpg'
if os.path.exists(fname):
os.remove(fname)
image.SaveFile(fname)
bye
N
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