<Image>.SavePNG (Function)

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Displaying a PNG image
Transparent image in PNG format

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<Image>.SavePNG (Function)

In french: <Image>.SauvePNG

Saves an image:

in a file in PNG format.
in memory.

This image corresponds to the image contained in a Image control.

Remarks:

Only the visible part of the Image control is saved.
The border of the Image control (if it exists) is also saved.
Reminder: The border of the Image control is defined in the "Style" tab of the description window of control.
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.

Versions 16 and later

This function is now available for Android applications.

New in version 16

This function is now available for Android applications.

Versions 17 and later

This function is now available for iPhone/iPad applications.

New in version 17

This function is now available for iPhone/iPad applications.

Versions 18 and later

This function is now available in Windows Store apps mode.

New in version 18

This function is now available in Windows Store apps mode.

Versions 21 and later

This function is now available in Universal Windows 10 App mode.

New in version 21

This function is now available in Universal Windows 10 App mode.

Example

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

// Sauve en mémoire l'image présente dans "IMG_ImageDessin"
ResSauvegarde = IMG_ImageDessin.SauvePNG(enMémoire)

Syntax

Saving an image in a file in PNG format Hide the details

<Result> = <Image control>.SavePNG(<File name> [, <Transparency color>])

<Result>: Boolean

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

<Image control>: Control name

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

<File name>: Character string

Name and full (or relative) path of PNG 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 PNG file is not checked. This file is automatically overwritten if it already exists.

<Transparency color>: Optional integer

Color that will be considered as being transparent in the image. This color can correspond to:
an RGB color (returned by RGB),
an HSL color (returned by HSL),
a WLanguage preset color.
If this parameter is not specified, the generated image is not transparent.

Syntax not available

Saving an image in memory Hide the details

<Result> = <Image control>.SavePNG(<inMemory> [, <Transparency color>])

<Result>: Buffer

Byte string containing the image in PNG format.
This string of bytes can then be assigned to an Image control, saved in a file (fSaveText function), sent through a network (thanks to Socket functions), ...

<Image control>: Control name

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

<inMemory>: Constant

inMemory: Constant used to save an image in memory.

<Transparency color>: Optional integer

Color that will be considered as being transparent in the image. This color can correspond to:
an RGB color (returned by RGB),
an HSL color (returned by HSL),
a WLanguage preset color.
If this parameter is not specified, the generated image is not transparent.
This parameter is ignored.

Remarks

Displaying a PNG image

Caution: If the image in PNG format is semi-transparent, the display of the image is slower.

Transparent image in PNG format

To save a transparent image in PNG format, the Image control must be filled with the transparent color beforehand.

Example used to draw a transparent line and to save it in PNG format:

IMG_Image1.DébutDessin(dAvecOpacité)
IMG_Image1.ChangeMode(dessinNormal)
POUR nI = 0 _À_ IMG_Image1..Largeur
POUR nJ = 0 _À_ IMG_Image1..Hauteur
IMG_Image1.DessinePoint(nI, nJ, RVB(255,255,255), 0)
FIN
FIN
IMG_Image1.Stylo(RVB(100, 020, 200), 0,10, 100)
IMG_Image1.DessineLigne(10, 10, 100, 10)
IMG_Image1.SauvePNG(ComplèteRep(fRepExe()) + "img.png")

Component: wd270pnt.dll