This compiler warning means that, at the line where it occurs, the value of a global variable is used that may not have been initialized.

 

For example:

global
    nCounter 
var
begin
    nCounter = nCounter + 1
end

To address the conditions that lead to this warning, make sure that any path of execution through your macro either assigns a value to the global variable, or verifies successfully that it was initialized previously.

 

Below is a snippet that does this:

if IsInitialized(nCounter)
   // successfull call branch 
   // do whatever you want, nCounter is already initialized
else
   // un-successfull call branch 
   // but we assign a value to nCounter, so NO warning
   nCounter = 0
endif   
nCounter = nCounter + 1

The difference between this message about global variables and the corresponding message for normal variables is that for global variables, the compiler checks that either the variable was assigned a value before reaching a particular line of code, or that a successful call to the function IsInitialized guarantees that the global variable was initialized in a previous iteration of the macro.

 

This message can also occur when your code has a branch before a line that refers to a global variable.

global
    nCounter
var
    bIsFirstPage
begin
    if n_OutputPage mod 2 == 0
        bIsFirstPage = IsInitialized(nCounter)
    endif   
    nCounter = nCounter + 1  // what happens if n_OutputPage mod 2 <> 0 ?
end

See also: variable is not initialized.

 

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Topic 109026, last updated on 18-Apr-2020