Promotic

FileReadVariable - method of the Pm object

Description:
Reading the value of the variable from the file (created by the Pm.FileWriteVariable method).
This method is obsolete (but functional) and it is better to use the PmBuffer.LoadFromFile method.
Syntax:
Variant FileReadVariable(String sFile)
Parameters:
sFile(String) The file name with the path.
If a full path is not entered, then it is completed relative to the application folder.
It is recommended to use the PROMOTIC path syntax - see PROMOTIC path to files and folders.
Note:
The read value can be of any data type, including an array.
If it cannot be read, then returns: null for JavaScript or Empty pro VBScript (it can be tested by the Pm.IsValid method).

This method is not functional in Web panels.
Example:
JavaScriptVBScriptSelect and copy to clipboard

var Value = Pm.FileReadVariable("#data:Value1.dat");
if (Pm.IsValid(Value))
{
// .. on success
}
else
{
// .. on error
}
PROMOTIC 9.0.17 SCADA system documentation - MICROSYS, spol. s r.o.

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