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  • Operating mode
  • Managing assertions
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Stored procedures
Checks whether an expression is Null in assertive programming and in automated test mode.
Versions 18 and later
Universal Windows 10 App This function is now available in Windows Store apps mode.
New in version 18
Universal Windows 10 App This function is now available in Windows Store apps mode.
Universal Windows 10 App This function is now available in Windows Store apps mode.
Versions 19 and later
iPhone/iPad This function is now available for iPhone/iPad applications.
New in version 19
iPhone/iPad This function is now available for iPhone/iPad applications.
iPhone/iPad This function is now available for iPhone/iPad applications.
Versions 21 and later
Apple Watch This function is now available in Apple Watch mode.
Universal Windows 10 App This function is now available in Universal Windows 10 App mode.
New in version 21
Apple Watch This function is now available in Apple Watch mode.
Universal Windows 10 App This function is now available in Universal Windows 10 App mode.
Apple Watch This function is now available in Apple Watch mode.
Universal Windows 10 App This function is now available in Universal Windows 10 App mode.
Versions 22 and later
Java This function is now available for Java applications.
Android Widget This function is now available in Android widget mode.
Android This function is now available for Android applications.
New in version 22
Java This function is now available for Java applications.
Android Widget This function is now available in Android widget mode.
Android This function is now available for Android applications.
Java This function is now available for Java applications.
Android Widget This function is now available in Android widget mode.
Android This function is now available for Android applications.
Example
// Si ChercheClient est une procédure qui cherche un client par son nom et qui renvoie
// l'objet CClient correspondant au client si le client est connu et Null sinon
// Il ne faudrait pas ajouter un client qui existe déjà
dbgCheckNull(ChercheClient(NomClient), "Le client '%1' est déjà connu", NomClient)
// Ajoute le client
AjouteClient(NomClient)
Syntax
dbgCheckNull(<Expression> [, <Comments> [, <Parameter 1> [... [, <Parameter N>]]]])
<Expression>: Character string
Expression that must be checked.
<Comments>: Character string
Character string in the format defined by StringBuild.
<Parameter 1>: Any type
First parameter expected by <Comments>.
<Parameter N>: Any type
Last parameter expected by <Comments>.
Remarks

Operating mode

When the expression is not Null:
  • WINDEVWEBDEV - Server code in test mode automatic, an error is added to the test report (equivalent to the TestWriteResult function).
  • in manual test mode, an assertion is displayed (equivalent to dbgAssert).
  • in runtime mode, an assertion is displayed if the assertions have been enabled (equivalent to dbgAssert).
When running an application, the expression is not evaluated if the assertions are not enabled.
Versions 19 and later
dbgOnError allows you to automatically start a WLanguage procedure used to retrieve the comment linked to the error.
New in version 19
dbgOnError allows you to automatically start a WLanguage procedure used to retrieve the comment linked to the error.
dbgOnError allows you to automatically start a WLanguage procedure used to retrieve the comment linked to the error.
Versions 22 and later
AndroidAndroid Widget

Managing assertions

The messages of dbgCheckNull will be written into the ADB log (at "Assert" level). For more details, see Managing ADB logs.
New in version 22
AndroidAndroid Widget

Managing assertions

The messages of dbgCheckNull will be written into the ADB log (at "Assert" level). For more details, see Managing ADB logs.
AndroidAndroid Widget

Managing assertions

The messages of dbgCheckNull will be written into the ADB log (at "Assert" level). For more details, see Managing ADB logs.
Business / UI classification: Neutral code
Component: wd270vm.dll
Minimum version required
  • Version 17
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