$define, different setting within different software projects

inside a unit i need different versions of a string constant.

where to put the {$DEFINE LET} command  inside different project mainforms ?
In the project source code ? in the mainForm class definition I tried already and failed
unit ......;
 
{$IfDef LET}
    RegistryStringPath = 'Software\Version0\Settings'
{$Else}
    RegistryStringPath = 'Software\Version1\Settings'
{$EndIf}

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BdLmAsked:
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HypoConnect With a Mentor Commented:
You don't have to put that DEFINE in your source code (.pas files), Instead you can add it to your project settings. Open your project options dialogue, and then go to Directories/Conditionals, and add Let to Conditional defines... With this way you can tie the define to your projects dof/cfg files instead of the actual source. (the example image is from delphi 7, but you should be able to find it in other versions as well)

regards
Hypo
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BdLmAuthor Commented:
fine, already working;
would there also be a methode to place it somewhere in the code, may be  more easy to remember ?  
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HypoCommented:
if you want to place it in your code, then you could do it in an .inc file, which you then include in your units where you need to do this test... this inc-file shall then be different for your two project versions... in one version LET will be defined,and in the other it will not.

When you include such a file you do it with compiler directive {$I}, and this should be considered as if the compiler replaced the {$I} directive with the contents of the included file, at that point in your source code.

ex:

implementation
...
{$I 'MyProjectDefines.inc'}
...

regards
Hypo
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BdLmAuthor Commented:
but this means I have to change the include file once I run the second project, Your first solution seem to be better for me
Thanks
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