VideoStartApp (Function)

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Help / WLanguage / WLanguage functions / Controls, pages and windows / Video functions

Photos and videos saved
Backup directories
Required application feature
Application in the background: Specific case from Android 10

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VideoStartApp (Function)

In french: VidéoLanceAppli

Starts the device's native camera application to record a video or to take a photo.

Remarks:

Remark: Syntax 2, which uses a non-locking call, is recommended, especially from iOS 8.
VideoStartApp must be executed in a thread.
In a WINDEV application, VidéoCapture can be used to record a video or to take a photo with the camera of the device.
This function is equivalent to CameraRunApp.

Example

sPhoto is string
sPhoto = VideoStartApp(viPictureCapture)
IF sPhoto <> "" THEN
Info("Photo sauvegardée dans le fichier " + sPhoto)
END

nTypeEnregistrement is int
// Laisse l'utilisateur décider du type de capture
IF Dialog("Souhaitez-vous enregistrer une image ou une vidéo?", ...
["Une image", "Une vidéo"], 1, 2, dlgIconQuestion) = 1 THEN
nTypeEnregistrement = viPictureCapture
ELSE
nTypeEnregistrement = viVideoCapture
END
// Lance l'application
VideoStartApp(nTypeEnregistrement, CB_VideoLanceAppli)

INTERNAL PROCÉDURE CB_VideoLanceAppli(sChemin is string)
// Si le retour vaut chaîne vide (""), une erreur a eu lieu
IF sChemin ~= "" THEN
Error(ErrorInfo())
RETURN
END
// Message de fin d'enregistrement
Info("Le fichier a été enregistré ici: " + sChemin)
END

Syntax

Starting the native camera application (locking call) Hide the details

<Result> = VideoStartApp([<Type of capture>])

<Result>: Character string

Full path of file where the photo or the video was saved,
Empty string ("") if an error occurred. To get more details on the error, use ErrorInfo.

<Type of capture>: Optional integer constant

Type of capture:
viPictureCapture Save a photo.
viVideoCapture
(Default value) Capture a video sequence.

Starting the native camera application (non-locking call) Hide the details

<Result> = VideoStartApp([<Type of capture> [, <WLanguage procedure>]])

<Result>: Boolean

True if the photo or video was saved.
False otherwise. To get more details on the error, use ErrorInfo.

<Type of capture>: Optional integer constant

Type of capture:
viPictureCapture Save a photo.
viVideoCapture
(Default value) Capture a video sequence.

<WLanguage procedure>: Procedure name

Name of the WLanguage procedure ("callback") called when the photo or video is recorded.
This procedure has the following format:
PROCEDURE <Nom de la procédure> (<Chemin>)

where <Path> corresponds to the backup path of image or video.

Remarks

Photos and videos saved

The photo and video settings (format, resolution, size) are the ones defined in the native camera application.

Backup directories

In Android applications, the photo or video is stored on the SD Card of the device and is automatically added to the album.
If photos must be used in your Android applications, we advise you to work with thumbnails and not with the initial photos taken by the device. To generate the thumbnails, use VideoGenerateThumbnail.

In iPhone/iPad applications:
By default:

the photos are saved in the "Documents" directory of application.
the videos are saved in the "tmp" directory of application.

For the images, you can also:

store the binary content of the image in a database, via a Memo item.
add the photo to the photo album of the device with AlbumSave. In this case, the image can be re-used via AlbumPicker.

The path returned by the function (syntax 1) or found in the procedure (syntax 2) has the following format:
/private/var/mobile/Containers/Data/Application/D235EF25-455B-4362-8941-0FD09C1D693D/Documents/photo504031018058.jpg
The directory (identified by "D235EF25-455B-4362-8941-0FD09C1D693D") can be renamed whenever the application is installed and updated.

In an iPhone/iPad application, you must only store the file name and extension in order to re-create the path through programming to access the photo.
Reminder: To reconstruct the complete path of the photo, simply use the fDataDir function.

Required application feature

The use of this function triggers the declaration of several application features in the application generation wizard.

Required features:

Microphone: This feature allows the applications to perform audio recordings.
WebCam: This feature allows the applications to capture videos or photos.

Application in the background: Specific case from Android 10

From Android 10, it is no longer possible to open a window when the application is in the background.

VideoStartApp can open a window. If this function is used while the application is in the background, a fatal error will occur.

Tips:

It is possible to determine if the application is in the background using InBackgroundMode.
If an application needs to interact with the user while it is in the background, the solution is to display a notification (via the Notification type). The application will be brought back to the foreground when the notification is clicked, if the ActivateApplication property is set to True. You can also open a window from the procedure passed to the ActionClick property.

For more details, see Android 10: Behavior of applications in the background.

Related Examples:

Cross-platform examples (WINDEV Mobile): WM Expense Account

[ + ] This example allows you to manage your fees.

Let's see the main features of this application:
- The input of invoices
- Management of foreign currencies
- Inclusion of photo document for the invoices
- Ability to email the expense account
- Ability to track the expense accounts
- ...

Business / UI classification: UI Code

Component: wd300android.aar