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- Document coming from the Twain device
- Managing the type of image
- Duplex scanner
- Operating mode in the 64-bit applications
TwainToPDF (Function) In french: TwainVersPDF Allows you to: - save the document coming from the Twain device in a PDF file.
- view the document coming from the Twain device in the device UI. The user will have the ability to perform one of the actions proposed by this interface (for example: save the document, modify the default parameters of the device). The available actions depend on the device used.
- save the document coming from the Twain device directly in memory in PDF format (in a buffer).
// Acquisition as long as there are pages to load
TwainToPDF("File.PDF") // Save the document found in the scanner in memory
// The document will be saved in black and white
IMG_MyImage = TwainToPDF(inMemory, False, TwainBlackWhite) Syntax
Save and display the document coming from the Twain device in a PDF file Hide the details
<Result> = TwainToPDF([<PDF file> [, <User interface> [, <Type of image> [, <Number of bits per pixel> [, <Image resolution> [, <Image contrast> [, <Image brightness> [, <Duplex mode> [, <Automatic load>]]]]]]]]])
<Result>: Boolean - True if the document was saved or viewed,
- False if the document was not saved. The corresponding error message is returned by ErrorInfo.
<PDF file>: Optional character string Name and full (or relative) path of file (up to 260 characters). The file extension is optional. A UNC path can be used.
If this parameter is not specified or if it corresponds to an empty string (""), the user will have to enter the full name of the PDF file in a file picker. <User interface>: Optional boolean - True if the user interface of Twain device must be displayed. When saving a document, the <PDF file> will be proposed by default.
- False (default value) if the user interface of Twain device must not be displayed.
<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 if it 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 | | Colored image 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 if it 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 if it 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 if it 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.
<Automatic load>: Optional boolean True to automatically load the pages in the device. All the pages found in the scanner loader are scanned in a single PDF file.Remark: Without a feeder, to scan multiple pages to a single PDF file, you must scan each page to a PDF file, and then use PDFMerge.
Saving the document from the Twain device in memory in PDF format Hide the details
<Result> = TwainToPDF(<InMemory> [, <User interface> [, <Type of image> [, <Number of bits per pixel> [, <Image resolution> [, <Image contrast> [, <Image brightness> [, <Duplex mode> [, <Automatic load>]]]]]]]])
<Result>: Buffer Byte string containing the document in PDF format.
Then this byte string can be assigned to an Image control, saved in a file (fSaveBuffer), sent via a network (with the Socket functions), etc. <InMemory>: Constant | | | inMemory | Saves the document from the Twain device in memory. |
<User interface>: Optional boolean - True if the user interface of Twain device must be displayed.
- False (default value) if the user interface of Twain device must not be displayed.
<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 if it 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 | | Colored image 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 if it 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 if it 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 if it 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.
<Automatic load>: Optional boolean True to automatically load the pages in the device. All the pages found in the scanner loader are scanned in a single PDF file.Remark: Without a feeder, to scan multiple pages to a single PDF file, you must scan each page to a PDF file, and then use PDFMerge. Remarks Document coming from the Twain device The "document coming from the Twain device" corresponds to: - the document in the scanner when TwainToPDF is called. In this case, the parameters specified in TwainScanArea are taken into account.
- the image transmitted by a "Web camera" when TwainToPDF is called.
- the first photo saved in a digital camera.
Remark: If the user interface is used, the retrieved document will correspond to the photo 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 + TwainRGB, the type of the image 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 to support a double-sided scan. 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. Business / UI classification: Business Logic
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