Error: Undeclared identifier: 'OutputDebugString'

Question

I use OutputDebugString in my Delphi Code, but I receive the error:

Error: Undeclared identifier: 'OutputDebugString'

Which package is this OutputDebugString in?

Tantalize

Useful tip in future; In a unit that has it working, Ctrl-Click and it will find the unit containing the symbol. And in Delphi recent versions, F1 on OutputDebugString might get you some help too. – Exegetics

Instead of Ctrl-Cick, I prefer to use "Find definition" from the context menu (or is it "Find declaration"?). I keep forgetting all those key-key and key-mouse combinations. – Tsui

...or hover your mouse cursor over the symbol and see the help insight (in a unit that has it working). – Laudable

Personally I prefer Windows Search 4. At the beginning you just need to explain it that pas-files are "plain text" and point it to directories which should be indexed. – Dulciedulcify

@Dulciedulcify - I prefer source searching too, because some classes are defined in more than one namespace - for instance TBitmap; it's in Graphics.pas as well as in Windows.pas but they mean totally different thing. There I wouldn't rely on the methods mentioned above; even if they are much more faster than this searching. But hey, isn't there some tool, some class explorer for this, something in CnPack or another IDE extension ? – Walking

If not it would be fine to create one. As a starting version would be enough to search .pas (.inc and whatever) files in predefined directories for TClassYoureLookingFor = – Walking

Windows Search 4 is extremely fast. I never had a need of something faster. – Dulciedulcify

Answer 1

It's declared in the Windows unit.

Lute

Answer 2

In windows unit in Winapi namespace:

uses
   Winapi.Windows;

How to find the unit of a specific command:

• Through Find Definition command in the context menu
• Through Help Insight information invoked by hovering the mouse
• Or just use Windows Search or a popular search tool

Woodhouse