dSaveImageJPEG (Function)

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Image found in a Web Camera control

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dSaveImageJPEG (Function)

In french: dSauveImageJPEG

Saves an image:

in a JPEG file.
in memory.

This image corresponds to the image found:

in an Image control.
in a variable of type Image.
in a Bar Code control.
in a Web Camera control.

Remarks:

Only the visible part of the Image control is saved.
This function can only be used to save the images for screen resolutions up to 32 bits.
This function cannot be used with the Image controls found in the reports.
This function can also be used to save the changes made by ImageInfoModify on the Exif tags of an image.

Example

See additional examples

// Sauve en mémoire l'image présente dans "IMG_ImageDessin"
ResSauvegarde = dSaveImageJPEG(IMG_ImageDessin, inMemory)

// Sauve l'image présente dans "IMG_ImageDessin" sur "C:\Documents\Image.JPEG"
ResSauvegarde = dSaveImageJPEG(IMG_ImageDessin, "C:\Documents\Image.JPEG")

// Modification des commentaires de l'image
// affichée dans le champ Image "IMG_MonChampImage"
ImageInfoModify(IMG_MonChampImage, imgComment, "Belles gorgones")
// Enregistrement de la modification dans le 
// fichier "C:\Plongees\Gorgone1.JPG"
dSaveImageJPEG(IMG_MonChampImage, "C:\Plongees\Gorgone1.JPG", 100, imgSaveTag)

Syntax

Saving an image in a JPEG file Hide the details

<Result> = dSaveImageJPEG(<Image> , <File name> [, <Quality> [, <Exif tag>]])

<Result>: Boolean

True if the image was saved,
False otherwise. To get more details on the error, use ErrorInfo with the errMessage constant.

<Image>: Name of the Image control or variable

Name of the Image, Bar Code or Web Camera control to be used. Image controls in a report cannot be used.
Name of the Image variable to be used.

<File name>: Character string

Name and full (or relative) path of JPEG file. A UNC path can be used. The file extension is optional.
Caution:
The destination directory must exist in order for the image to be saved.
The existence of the JPEG file is not checked. This file is automatically overwritten if it already exists.

<Quality>: Optional integer

Quality of the image saved. Value between 1 and 100 (80 by default). Lower image quality translates into higher image compression rate and smaller file size.

<Exif tag>: Optional constant (or combination of constants)

Save the Exif tags modified by ImageInfoModify:
imgAddThumbnail Adds a thumbnail into the image file (<File name>).
If there is a thumbnail in the image file displayed in the Image control, this constant is not taken into account.
imgGrayScale Used to save the image in black and white ("Grayscale" display mode).
imgProgressiveJPEG Used to save the image in progressive JPEG format. This format is mainly used for the Web sites. It allows the pages to be loaded faster (the images being loaded and displayed progressively).
imgSaveTag Saves the Exif tags.
If there is a thumbnail in the image file displayed in the Image control, a new thumbnail is recalculated.

By default, the Exif tags are not saved, no operation is performed on the thumbnails.

Saving an image in memory Hide the details

<Result> = dSaveImageJPEG(<Image> , <inMemory> [, <Quality> [, <Exif tag>]])

<Result>: Buffer

Byte string containing the image in JPEG format.
Then this byte string can be assigned to an Image control, saved in a file (fSaveText), sent via a network (with the Socket functions), ...

<Image>: Name of the Image control or variable

Name of the Image, Bar Code or Web Camera control to be used. Image controls in a report cannot be used.
Name of the Image variable to be used.

<inMemory>: Constant

inMemory: Constant used to save an image in memory.

<Quality>: Optional integer

Quality of the image saved. Value between 1 and 100 (80 by default). Lower image quality translates into higher image compression rate and smaller file size.

<Exif tag>: Optional constant (or combination of constants)

Save the Exif tags modified by ImageInfoModify:
imgAddThumbnail Adds a thumbnail into the image file (<File name>).
If there is a thumbnail in the image file displayed in the Image control, this constant is not taken into account.
imgProgressiveJPEG Used to save the image in progressive JPEG format. This format is mainly used for the Web sites. It allows the pages to be loaded faster (the images being loaded and displayed progressively).
imgSaveTag Saves the Exif tags.
If there is a thumbnail in the image file displayed in the Image control, a new thumbnail is recalculated.

By default, the Exif tags are not saved, no operation is performed on the thumbnails.
This parameter is available only if <Control name> corresponds to the name of an Image control.

Remarks

Image found in a Web Camera control

Only the image displayed when dSaveImageJPEG is executed is saved. To save this image, you can also use:

the VideoCapture function: the image will be saved as a BMP file
the dSaveImageBMP function: the image will be saved in BMP format or in memory
the dSaveImageGIF function: the image will be saved in GIF format or in memory
the dSaveImagePNG function: the image will be saved in PNG format or in memory.

Component: wd300pnt.dll