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- Document coming from the Twain device
- Managing the type of image
- Duplex scanner
- Operating mode in the 64-bit applications
TwainToControl (Function) In french: TwainVersChamp Allows: - view the document coming from the Twain device in an Image control.
- view the document coming from the Twain device in the device UI. The user can perform any of the actions proposed by this interface (e.g. save document, change device default settings).. The available actions depend on the device used.
When validating the user interface, the document coming from the Twain device will be displayed in an Image control. The parameters specified in the user interface will be taken into account.
The image will be displayed in the Image control according to the display parameters defined in the description window of the Image control ("Description" in the context menu).
IF TwainToControl(IMG_MonImage, False, TwainBlackWhite) = True THEN
Info("L'image est affichée dans le champ Image")
ELSE
Error("L'image n'a pas pu être récupérée")
END
Syntax
<Result> = TwainToControl(<Image control> [, <User interface> [, <Type of image> [, <Number of bits per pixel> [, <Image resolution> [, <Image contrast> [, <Image brightness> [, <Duplex mode>]]]]]]])
<Result>: Boolean - True if the document is viewed (in an Image control or in the user interface),
- False otherwise. The corresponding error message is returned by ErrorInfo.
<Image control>: Character string Name of Image control where the document will be viewed. <User interface>: Optional boolean - True (default value) if the user interface of the Twain device must be displayed,
- False otherwise.
<Type of image>: Optional Integer constant (or combination of constants) Type of image used to save the document (classified by order of color management): | | | | Order for managing the colors | | | | 0 (Default value) | Default device image. | | 1 | TwainPalette | Image whose colors are issued from a palette. | | 2 | TwainRGB | RGB image. | | 3 | TwainGrayScale | Grayscale image. | | 4 | TwainBlackWhite | Black and white image. | | - | TwainAnyType | Any type of image. |
If these constants are combined, the best type of image supported by the device will be selected (according to the order of color management). For more details, see the remarks.The default type of image will be used:
- if this parameter is not specified or corresponds to 0.
- if the specified type of image is not supported by the device.
- if <User interface> is set to True.
<Number of bits per pixel>: Optional integer Amount of information about the colors (to display or print each pixel in an image). The larger the number of bits per pixel, the sharper the color rendering will be.
The possible values for this parameter depend on the type of image used: | | | Type of image | Possible values | | Image whose colors are issued from a palette (TwainPalette constant) | 1, 4 or 8 | | RGB image (TwainRGB constant) | 8, 10 or 16 | | Grayscale image (TwainGrayScale constant) | 8 or 16 | | Image in black and white (TwainBlackWhite constant) | 1 |
If this parameter is not specified, the default number of bits per pixel will be used. <Image resolution>: Optional real Number of pixels per inch (the possible values depend on the device used).
The default image resolution will be used:
- if this parameter is not specified or corresponds to 0.
- if the specified resolution is not supported by the device.
- if <User interface> is set to True.
<Image contrast>: Optional real Contrast of the image (value included between -1000 and 1000).
The default image contrast will be used:
- if this parameter is not specified or corresponds to 0.
- if the specified contrast is not supported by the device.
- if <User interface> is set to True.
<Image brightness>: Optional real Brightness of the image (value included between -1000 and 1000).
The default image brightness will be used:
- if this parameter is not specified or corresponds to 0.
- if the specified brightness is not supported by the device.
- if <User interface> is set to True.
<Duplex mode>: Optional boolean - True to scan a document on both sides,
- False (by default) to scan the document on a single side.
Remarks Document coming from the Twain device The "document coming from the Twain device" corresponds to: - the document in the scanner when TwainToControl is called. In this case, the parameters specified in TwainScanArea are taken into account.
- the image transmitted by a "Web camera" when TwainToControl is called.
- the first photo saved in a digital camera.
Note: If user interface is used, the document retrieved will correspond to the photograph selected by the user.. If several photos are selected, only the first selected photo will be retrieved.
Managing the type of image If several constants are combined in <Type of image>, the best type of image supported by the device will be selected (according to the order of color management). For example: If this parameter corresponds to TwainBlackWhite + TwainRVB, the image type will be: - RGB if this type is supported by the device.
- black and white otherwise.
Duplex scanner If the scanner supports the duplex mode, you have the ability to perform a double-sided scan. The generated document contains both sides of the scanned document. Remark: Depending on the hardware used, the Twain driver may not be sufficient for duplex scanning.. You may have to install additional drivers supplied by the manufacturer. 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.
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