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Stored procedures
Checks whether an expression is Null in assertive programming and in automatic 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 21 and later
Universal Windows 10 App This function is now available in Universal Windows 10 App mode.
New in version 21
Universal Windows 10 App This function is now available in Universal Windows 10 App 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 the Java applications.
New in version 22
Java This function is now available for the Java applications.
Java This function is now available for the Java applications.
Example
// If FindCustomer is a procedure used to find a customer identified by its name and that returns
// the CCustomer object corresponding to the customer if the customer is known and Null otherwise
// A customer who already exists must not be added
dbgCheckNull(FindCustomer(CustomerName), "Customer '%1' is already known", CustomerName)
// Adds the customer
AddCustomer(CustomerName)
Syntax
dbgCheckNull(<Expression> [, <Comments> [, <Parameter 1> [... [, <Parameter N>]]]])
<Expression>: Character string (with or without quotes)
Expression that must be checked.
<Comments>: Character string (with quotes)
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:
  • WINDEV in automatic test mode, an error is added into the status report of the test (equivalent to TestWriteResult).
  • 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.
Component : wd240vm.dll
Minimum version required
  • Version 17
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