4D v13.4
Is picture file
- 4D Language Reference
-
- Pictures
-
- Pictures
- BLOB TO PICTURE
- COMBINE PICTURES
- CONVERT PICTURE
- CREATE THUMBNAIL
- Equal picturesNew
- Get picture file nameNew
- GET PICTURE FROM LIBRARY
- GET PICTURE KEYWORDSNew
- GET PICTURE METADATA
- Is picture file
- PICTURE CODEC LIST
- PICTURE LIBRARY LIST
- PICTURE PROPERTIES
- Picture size
- PICTURE TO BLOB
- PICTURE TO GIF
- PICTURE TYPE LIST
- QT COMPRESS PICTURE
- QT COMPRESS PICTURE FILE
- QT LOAD COMPRESS PICTURE FROM FILE
- READ PICTURE FILE
- REMOVE PICTURE FROM LIBRARY
- SAVE PICTURE TO FILE
- SET PICTURE FILE NAMENew
- SET PICTURE METADATA
- SET PICTURE TO LIBRARY
- TRANSFORM PICTURE
- WRITE PICTURE FILE
Is picture file
| Is picture file ( filePath {; *} ) -> Function result | ||||||||
| Parameter | Type | Description | ||||||
| filePath | Text |
|
File pathname | |||||
| * | Operator |
|
Validate data | |||||
| Function result | Boolean |
|
True = filePath designates a picture file; otherwise, False | |||||
The Is picture file command tests the file designated by the filePath parameter and returns True if it is a valid picture file. The command returns False if the file is not of the picture type or if it is not found.
Pass the pathname of the picture file to be tested in the filePath parameter. The path must be expressed with the system syntax. You can pass an absolute pathname or a pathname relative to the database structure file. If you pass an empty string (""), the command returns False.
If you do not pass the * parameter, the command tests the file by looking for its extension among the list of available codecs. If you want to be able to test files without extensions or to carry out a more thorough verification, pass the * parameter. In this case, the command makes additional tests: it loads and inspects the file header and queries the codecs in order to validate the picture. This syntax slows command execution.
Note: The command returns True for PDF files under Windows and EMF files under Mac OS.
Product: 4D
Theme: Pictures
Number:
1113
Created: 4D v12
