QPx_ExportPictureToBLOB
| QPx_ExportPictureToBLOB(srcPict; srcPict; srcPict; srcPict; srcPict):error | |||
|---|---|---|---|
 |
srcPict | Picture | Source picture variable |
 |
targetBlob | BLOB | BLOB to receive the image |
|
targetType | Text | 4-char image type identifier |
 |
exportSettings | BLOB | Export settings |
|
exportOptions | Longint | Export options (optional) |
|
error | Longint | Error result |
Save a picture variable into a BLOB
The source picture is passed in the srcPict parameter.
The targetBlob parameter is the target BLOB. After successful completion of the command, targetBlob receives the image data.
The targetType parameter specifies the target file format. To get the list of avaliable export formats, call the QPx_GetExportTypes command. QPix defines the following constants for the export formats supported by QuickTime:
| qpx_JPEGFile | "JPEG" | JPEG/JIFF file format |
| qpx_TIFFFile | "TIFF" | TIFF file format |
| qpx_PNGFile | "PNGf" | PNG file format |
| qpx_BMPFile | "BMPf" | BMP file format |
| qpx_PhotoshopFile | "8BPS" | Adobe Photoshop file format |
| qpx_PictureFile | "PICT" | Apple PICT file format |
| qpx_QTImageFile | "qtif" | QuickTime Image file format |
| qpx_TargaFile | "TPIC" | Truevision Targa file format |
| qpx_SGIImageFile | ".SGI" | Silicon Graphics SGI file format |
| qpx_MacPaintFile | "PNTG" | Apple MacPaint file format |
| qpx_JPEG2000File | "jp2 " | JPEG 2000 file format (supported on Mac OS X only) |
The exportSettings parameter can be used to specify format-specific settings for the export operation, and to receive settings after a successful image export. Not all export formats support settings. If the specified export format does not support settings, this parameter is ignored. If an empty BLOB is passed, format-specific defaults are used.
NOTE The exportSettings BLOB parameter must contain valid export settings. The structure of this BLOB is known as a QuickTime Atom Container and cannot be easilly parsed, constructed, or altered with 4D BLOB commands. Normally you let the user modify the export settings by calling the QPx_DoExportSettingsDialog high-level command. To fiddle with the settings BLOB at your own risk, use the plug-in QTAtoms.bundle that is included in the QPix distribution package.
The exportOptions parameter is optional. The following constant is supported.
| qpx_ExportWithProgress | 0x0001 | Display a progress dialog during long operations. Supported by some export components. |
| qpx_ExportInputProfile | 0x0002 | Copy the source image color profile, if any, to the output image. Supported by some export components. |
| qpx_ExportInputTags | 0x0004 | Copy the source image tags, if any, to the output image. Supported by some export components. |
| qpx_ExportThumbnail | 0x0008 | Create an embedded thumbnail inside an exported image. Currently supported only by the JPEG and TIFF exporters. The embedded thumbnails are 160 x 120 pixels max by default, in compliance with the Exif2.1/DCF specification. This can be changed through the /export/exif-thumb-width and /export/exif-thumb-height plug-in options. |
Example
// Save a picture into a BLOB, in JPEG format C_LONGINT($error) C_PICTURE($picture) C_BLOB($jpegImage) C_BLOB($settings) $picture:=[Images]Picture $error:=QPx_ExportPictureToBLOB ($picture;$jpegImage;qpx_JPEGFile;$settings) If ($error#qpx_noErr) // Handle the error End if
Related commands
| QPx_GetExportTypes | Get the list of available exporters |
| QPx_DoExportSettingsDialog | Display the export settings dialog for a specific file type |