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#1 Posted : Thursday, July 20, 2006 11:33:01 PM(UTC)

tberg  
tberg

Groups: Registered
Posts: 1


I am evaluating Imaging/Barcode/PDF Tools EVAL 14.5 for a Delphi VCL project. I would set
all twain parameters into the code (Without a Twain Dialog).
 
If i set the ColorScheme parameter from TWPT_BW to TWPT_GRAY i can see no result. 

- if i change the "HorzResolution" or other settings i can see the results
- if i change from "AcquireMulti" to "Acquire" i can see the change from TWPT_BW to TWPT_GRAY
- if i change the parameter about the twain dialog i can see the correct result


Here is the code...

     LEADTwain1.SelectSource();
     SetFocus();

     FillMemory ( @twProps, sizeof(LTWAINPROPERTIES), 0 );

     nRet:= LEADTwain1.GetProperties ( @twProps, LTWAIN_PROPERTIES_GETCURRENT );

     if ( nRet <> SUCCESS ) then
        begin
        Exit;
        end;

     twProps.DataTransfer.nTransferMode:= TWSX_FILE;
     StrCopy ( twProps.DataTransfer.szFileName, 'd:\temp\Twain.tif' );
     twProps.DataTransfer.nScanFileFormat    := TWFF_TIFFMULTI;
     twProps.DataTransfer.nBufMemCompression := TWCP_NONE;
     twProps.ImageRes.fHorzResolution        := 300;
     twProps.ImageRes.fVertResolution        := 300;
     twProps.ImageEff.nColorScheme           := TWPT_GRAY;
     twProps.nDuplexScanning                 := 2;


     LEADTwain1.EnableSetPropertiesEvent:= True;
     nRet:= LEADTwain1.SetProperties ( @twProps, LTWAIN_PROPERTIES_SET );
     if ( nRet <> SUCCESS ) then
        begin
        Exit;
        end;

    LEADTwain1.EnableAcquireMultiEvent:=True;
    LEADTwain1.EnableAcquirePageEvent:=True;

    nRet:= LEADTwain1.AcquireMulti ( 'd:\temp\test.tif', LTWAIN_SHOW_NONE, LTWAIN_BUFFER_MODE, FILE_TIF, 1, TRUE, 0, TRUE );


Thanks for your help.

 

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#2 Posted : Monday, July 24, 2006 6:17:22 AM(UTC)
Maen Hasan

Groups: Registered, Tech Support
Posts: 1,328

Was thanked: 1 time(s) in 1 post(s)

Hello,

If your scanner driver supports the Image Pixel Type capability, you can use the following code to set its value:
-------------------------------
Var
nRet: L_INT;
twCap: TW_CAPABILITY;
Begin
LEADTwain1.InitSession(Handle);
// Show the Twain Select Source UI
nRet := LEADTwain1.SelectSource();
If(nRet <> SUCCESS) then
Begin
ShowMessage('Error occurred while selecting the source.');
Exit;
End;

twCap.Cap:= ICAP_PIXELTYPE;
twCap.ConType:= TWON_ONEVALUE;

// Set the desired pixel type in the last parameter
LEADTwain1.CreateNumericContainerOneValue (@twCap, TWAINNUMERICTYPE_TW_UINT16, L_TWPT_RGB);

nRet := LEADTwain1.SetCapability(@twCap, LTWAIN_CAPABILITY_SET);
LEADTwain1.FreeContainer(@twCap);
-------------------------------

Thanks,
Maen Badwan
LEADTOOLS Technical Support
 
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