How to save a control (not a usercontrol) property at run-time ?

Hi everybody,

I have a label on a form and I would like to be able to change the label caption and to save this caption at run-time.
So the next time I open the project this new caption appears in the property sheet.

Is it possible ?

Thanks

SCML

scmlAsked:
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Arthur_WoodConnect With a Mentor Commented:
YOu can't change the values of the properties of the control, set when the program is run, to make those changed values visible in the IDE.  However, you can save the values assigned to a control, at run-time, so that the next time the program is run, that (those) controls are set to the values that they were changed to the previous time the program was run.

I do this all the time, using the SaveSetting and GetSetting functins to save/get the values from the System Registry:


Private Sub Form_Load()
  ..
   .
   .
    Evaluator = Val(GetSetting("MissCap", "Assess", "Evaluator", "-1"))
   
    cboEvaluator.ListIndex = Evaluator
    SubFactor = Val(GetSetting("MissCap", "Assess", "SubFactor", "-1"))
    Question = CInt(GetSetting("MissCap", "Assess", "Question", "1"))
    cboSubFactor.ListIndex = SubFactor
    txtQNum.Text = Question
 

here I am retrieving tha values fo the ListIndex property of two ComboBoxes, as set the time before (if not set, then the default value (-1)) is returned (the values are saved in the Registry as Strings, hence the use of the Val function.

then in the event Handler for the cmdDone button which close the app:

    SaveSetting "MissCap", "Assess", "Company", cboCompany.ListIndex
    SaveSetting "MissCap", "Assess", "Evaluator", cboEvaluator.ListIndex
    SaveSetting "MissCap", "Assess", "SubFactor", cboSubFactor.ListIndex
    SaveSetting "MissCap", "Assess", "Question", txtQNum.Text
  I save the current setting of the Control values, so they can be restored the nexct time the program is run.


Look up the SaveSetting and GetSetting functions in the VB Help System.
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Nitin SontakkeDeveloperCommented:
No direct way of doing it in a runtime app. Will have to resort to persistent storage such as Registry. But listen to what others have to say, too.
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Arthur_WoodCommented:
what "property sheet" are you refering to.  Do you mean the Property Sheet that is displayed in the VB IDE when you either right click on the control, and select Properties, or sselect the control and press the F4 key?

How is your application setup to display the Property Page?
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scmlAuthor Commented:
Yes, I mean the property sheet that is displayed in the VB IDE. But it would be only to see if the change on the property has been made.

When the program is run, this property sheet will not show of course.

Thanks
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Nitin SontakkeDeveloperCommented:
The properties that we change during development, they are persisted in the .frm files itself, which are normal text files, which you can even modify / write even using notepad. IDE is just a tool to create these files, nothing more than that.

At runtime, these files are neighter available nor desired to be present so persisting values in these is just out of question, i think.

You will need to resort to some other storage such as Registry or database, your custome text file, anything...

Runtime modifications to such properties will not again be visible in development environment as obviously they are stored at different places.

Come to think of this, if you are going to supply .frms with app (or may be write to it if file exists!), you can write a function to manipulate these files as they are simple text files. However, i discourage you to do so.

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Arthur_WoodCommented:
YOu can't change the values of the properties of the control, set when the program is run, to make those changed values visible in the IDE.  However, you can save the values assigned to a control, at run-time, so that the next time the program is run, that (those) controls are set to the values that they were changed to the previous time the program was run.

I do this all the time, using the SaveSetting and GetSetting functins to save/get the values from the System Registry:


Private Sub Form_Load()
  ..
   .
   .
    Evaluator = Val(GetSetting("MissCap", "Assess", "Evaluator", "-1"))
   
    cboEvaluator.ListIndex = Evaluator
    SubFactor = Val(GetSetting("MissCap", "Assess", "SubFactor", "-1"))
    Question = CInt(GetSetting("MissCap", "Assess", "Question", "1"))
    cboSubFactor.ListIndex = SubFactor
    txtQNum.Text = Question
 

here I am retrieving tha values fo the ListIndex property of two ComboBoxes, as set the time before (if not set, then the default value (-1)) is returned (the values are saved in the Registry as Strings, hence the use of the Val function.

then in the event Handler for the cmdDone button which close the app:

    SaveSetting "MissCap", "Assess", "Company", cboCompany.ListIndex
    SaveSetting "MissCap", "Assess", "Evaluator", cboEvaluator.ListIndex
    SaveSetting "MissCap", "Assess", "SubFactor", cboSubFactor.ListIndex
    SaveSetting "MissCap", "Assess", "Question", txtQNum.Text
  I save the current setting of the Control values, so they can be restored the nexct time the program is run.


Look up the SaveSetting and GetSetting functions in the VB Help System.
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scmlAuthor Commented:
Thanks to all !

SCML
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