<Image variable>.SavePNG (Function)

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Displaying a PNG image
Transparent image in PNG format

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<Image variable>.SavePNG (Function)

In french: <Variable Image>.SauvePNG

Saves an image found in an Image variable:

in a file in PNG format.
in memory.

Notes:

The border of the Image control (if it exists) is also saved.
This function can only be used to save the images for screen resolutions up to 32 bits.

Caution: A specific configuration is required to use this function in Linux. See The drawings for more details.

Example

MyImage is Image = "Test.gif"
// Saves the image found in MyImage in "C:\Documents\Image.PNG"
ResSave = Mymage.SavePNG("C:\Documents\Image.PNG")

MyImage is Image = "Test.gif"
// Saves the image contained in MyImage in memory
ResSave = MyImage.SavePNG(inMemory)

Syntax

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

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

<Result>: Boolean

True if the image was saved,
False otherwise. To find out the error details, use ErrorInfo associated with the errMessage constant.

<Image variable>: Image variable

Name of the Image variable to use.

<File name>: Character string (with quotes)

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 corresponds to:
an RGB color (returned by RGB),
an HSL color (returned by HSL),
a preset color of WLanguage.
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 variable>.SavePNG(<inMemory> [, <Transparency color>])

<Result>: Buffer

Byte string containing the image in PNG 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 variable>: Image variable

Name of the Image 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 corresponds to:
an RGB color (returned by RGB),
an HSL color (returned by HSL),
a preset color of WLanguage.
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:

MyImage is Image = "Test.gif"
MyImage.StartDrawing(dWithOpacity)
MyImage.ChangeMode(drawDefault)
FOR nI = 0 _À_ MyImage..Width
FOR nJ = 0 _À_ MyImage1..Height
MyImage.DrawPoint(nI, nJ, RGB(255,255,255), 0)
END
END
MyImage.Pen(RGB(100, 020, 200), 0,10, 100)
MyImage.DrawLine(10, 10, 100, 10)
MyImage.SavePNG(CompleteDir(fExeDir()) + "img.png")

Component : wd240pnt.dll