winapi - Delphi - Calling Win API -

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what difference between calling win api in following codes

code #1:

uses   winapi.activex;  procedure foo(); var   pv :pointer; begin   cotaskmemfree(pv); end;

code #2:

procedure cotaskmemfree(     pv: pointer     ); stdcall; external 'ole32.dll';  procedure foo(); var   pv :pointer; begin   cotaskmemfree(pv); end;

i noticed executable file size of code 1 (161,792 bytes) bigger executable file of code 2 (23,552 bytes). think because of code 1 compile following units. 

unit winapi.activex;  uses winapi.messages, system.types, winapi.windows;
  • is there other advantage of using method used on #code2 ?
  • is there risk of doing ?

the difference in size reasons outline. when use unit, executable contain code unit, , dependent units. there various options can use reduce impact, invariably executable size increase when use unit not used.

procedure cotaskmemfree(pv: pointer); stdcall; external 'ole32.dll';

it reasonable define yourself, in manner, , avoid using winapi.activex. in fact, far better if delphi rtl more granular support such uses. it's quite natural wish access com heap allocation routines, nothing more.


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