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    <p>You can work with this kind of array, defining your own type:</p> <pre><code>type TCharDynArray = array of char; procedure Clear(AArray: TCharDynArray); var I: Integer; begin for I := Low(AArray) to High(AArray) do AArray[I] := #0; end; procedure test; var MyArray: TCharDynArray; begin Clear(MyArray); end; </code></pre> <p>This code will compile fine. It doesn't do anything useful of course (the AArray parameter is not set as "var", so it's copied on the stack before assigning a #0 to every item). But at least, it compiles.</p> <p>In practice, I found out more easy to define or use high-level of types for dynamic arrays (like TIntegerDynArray), because at least it allows you to pass the array as reference, using a var, therefore avoiding to make a copy on stack, and make your code faster.</p> <p>About the mapping to a PChar, it's usual for all dynamic arrays: you can map a TIntegerDynArray to a pointer, then use it as a PInteger or a PIntegerArray:</p> <pre><code>procedure AddInteger(var Values: TIntegerDynArray; Value: integer); var n: integer; begin n := Length(Values); SetLength(Values,n+1); Values[n] := Value; end; procedure Loop(V: PInteger); begin if V&lt;&gt;nil then while V^&lt;&gt;0 do begin write(V^,' '); inc(V); // go to next integer in array end; end; var IntArray: TIntegerDynArray; begin Loop(pointer(IntArray)); // will display nothing, since pointer(IntArray)=nil for IntArray=[] AddInteger(IntArray,2); AddInteger(IntArray,3); AddInteger(IntArray,0); Loop(pointer(IntArray)); // will display '2 3 ' end. </code></pre> <p>The problem is the "array of char" code beeing inconsistent with "array of integer" is certainly in compiler intrinsics, and the fact that a PChar can be type-casted to a string.</p>
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