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whatsup



Joined: 01 Feb 2010
Posts: 8
whatsup
1. what does it mean import library,
does the compiler add/link my program to a code which will load the library i use ?
or does the OS do that, by lookink in the header of the EXE file ?

2. when i call to a function in dll, say MessageBox, does the OS load this dll for every program, put it in memory location, and then every app can use it ?
or does it loaded only once, for each app, (when the app terminate, the dll unloaded) ?
Post 01 Feb 2010, 16:07
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Borsuc



Joined: 29 Dec 2005
Posts: 2466
Location: Bucharest, Romania
Borsuc
whatsup wrote:
1. what does it mean import library,
does the compiler add/link my program to a code which will load the library i use ?
or does the OS do that, by lookink in the header of the EXE file ?
I think you're referring to "import table"? It's a format used to say which functions to import from which .dlls (that export such functions obviously) in the .exe -- the Windows Loader then replaces the data there with addresses to such functions, and then executes the program.

whatsup wrote:
or does it loaded only once, for each app, (when the app terminate, the dll unloaded) ?
That was the whole initial point of .dlls, so yeah. They are loaded only once, and everytime a new program loads it, a counter increments saying how many use the .dll -- when the counter becomes 0, the .dll is unloaded (no apps use it anymore).

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Post 01 Feb 2010, 18:06
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whatsup



Joined: 01 Feb 2010
Posts: 8
whatsup
thank you very much, you got me understand that, much better now.
Post 01 Feb 2010, 22:02
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