TwainProperty (Function)

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Specific properties
Operating mode in the 64-bit applications

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TwainProperty (Function)

In french: TwainPropriété

Allows you to find out or modify the properties of the current Twain device. This Twain device can be selected by TwainSelectSource.

Example

// Find out the scanner resolution
nResolution is int = TwainProperty(TwainResolution)

// Modify the resolution to 200 dpi
bApply is boolean = TwainProperty(TwainResolution, 200)

Syntax

Finding out the properties of the current Twain device Hide the details

<Result> = TwainProperty(<Property>)

<Result>: Integer

Value of specified property.
0 if the TWAIN device does not support the modification of the requested property or the value of the requested property.

<Property>: Integer constant

Property whose values are requested. This property corresponds to one of the following constants:
TwainBitsByPixel Number of bits per pixel.
TwainBrightness Brightness of the device.
<Value> must be included between -1000 and 1000.
TwainFeederEnabled Management mode of feeder. <Result> is set to:
True if the feeder is enabled,
False otherwise.
TwainContrast Contrast of the Twain device. <Result> will be included between -1000 and 1000.
TwainBorderDetectionEnabled Detection mode of borders. <Result> is set to:
True if the detection of borders is enabled,
False otherwise.
TwainBarCodeDetectionEnabled Detection mode of bar codes. <Result> is set to:
True if the detection of bar codes is enabled,
False otherwise.
TwainHeight Maximum height (in millimeters).
TwainInterfaceControllable Management mode of user interface. <Result> is set to:
True if the user interface can be disabled,
False otherwise.
TwainWidth Maximum width (in millimeters)
TwainReady Status of the device. <Result> is set to:
True if the device is plugged in and ready,
False otherwise.
TwainDuplex Support for double side. <Result> is set to:
True if the device supports the double side,
False otherwise.
TwainDuplexEnabled Management mode of double side. <Result> is set to:
True if the double side is enabled,
False otherwise.
TwainAutoResizeEnabled Management mode of automatic resize. <Result> is set to:
True if the automatic resize of images is enabled,
False otherwise.
TwainAutoDeskewEnabled Management mode of automatic image deskew. <Result> is set to:
True if the automatic deskew of images is enabled,
False otherwise.
TwainResolution Resolution in pixels per inch.
TwainAutoRotationEnabled Management mode of image rotation. <Result> is set to:
True if the automatic image rotation is enabled,
False otherwise.
TwainBlankPageSkipEnabled Management mode of blank pages. <Result> is set to:
True if the blank pages are skipped,
False otherwise.
TwainType Type of supported images. <Result> is set to:
TwainPalette: Manages the colored images issued from a palette (1, 4 or 8 bits per pixel).
TwainRGB: Manages the RGB image (24 bits per pixel).
TwainGrayScale: Manages the grayscale images.
TwainBlackWhite: Manages the black and white images.

Modifying the properties of the current Twain device Hide the details

<Result> = TwainProperty(<Property> , <Value>)

<Result>: Boolean

True if the property was modified,
False otherwise

<Property>: Integer constant

Property whose value must be modified. This property corresponds to one of the following constants:
TwainBitsByPixel Number of bits per pixel.
TwainBrightness Brightness of the device: <Value> will be included between -1000 and 1000.
TwainFeederEnabled Management mode of feeder. <Value> is set to:
True if the feeder must be enabled,
False otherwise.
TwainContrast Contrast of the Twain device. <Value> will be included between -1000 and 1000.
TwainBorderDetectionEnabled Detection mode of borders. <Value> is set to:
True if the detection of borders must be enabled,
False otherwise.
TwainBarCodeDetectionEnabled Detection mode of bar codes. <Result> is set to:
True if the detection of bar codes must be enabled,
False otherwise.
TwainDuplexEnabled Management mode of double side. <Value> is set to:
True to enable the double side,
False otherwise.
TwainAutoResizeEnabled Management mode of automatic resize. <Value> is set to:
True if the automatic resize of images must be enabled,
False otherwise.
TwainAutoDeskewEnabled Management mode of automatic image deskew. <Value> is set to:
True if the automatic image deskew must be enabled,
False otherwise.
TwainResolution Resolution in pixels per inch.
TwainAutoRotationEnabled Management mode of image rotation. <Value> is set to:
True if the automatic image rotation must be enabled,
False otherwise.
TwainBlankPageSkipEnabled Management mode of blank pages. <Value> is set to:
True if the blank pages must be skipped,
False otherwise.
TwainType Type of supported images. <Value> corresponds to the following constant or combination of constants:
TwainPalette: Manages the colored images issued from a palette (1, 4 or 8 bits per pixel).
TwainRGB: Manages the RGB image (24 bits per pixel).
TwainGrayScale: Manages the grayscale images.
TwainBlackWhite: Manages the black and white images.

<Value>: Integer

New value for the requested property.

Remarks

Specific properties

You have the ability to retrieve or modify the value of a property not listed in the above-mentioned Twain constants. In this case, the <Property> parameter will correspond to the value of the CAP_xxx or ICAP_xxx constant of TWAIN.H, associated with the requested property.

Operating mode in the 64-bit applications

In a 64-bit application, this function will automatically use the 64-bit Twain driver. The TWAIN cannot be used if this driver is not installed.

Component : wd250std.dll