Import

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Import

External linkage attribute for public data located in DLL's

Syntax

Extern Import symbolname[( subscripts)] [ Alias "aliasname"] [ As DataType] [, ...]

Description

Is used only (with the Extern keyword) in external modules to access global variables from Win32 DLLs: the variable names will be added to the dynamic library import list so that their addresses can be fixed at run-time.
This is due to the level of indirection on any such access: an implicit pointer dereference.

Remarks

Dialect Differences

• Not available in the -lang qb dialect unless referenced with the alias __Import.

Differences from QB

• New to FreeBASIC

See also

• Extern

Examples

/* mydll.c :

    compile With

      gcc -Shared -Wl,--strip-all -o mydll.dll mydll.c

*/

__declspec( dllexport ) Int MyDll_Data = 0x1234;

/'  import.bas :

 Compile with

   fbc import.bas

'/

#inclib "mydll"

Extern Import MyDll_Data Alias "MyDll_Data" As Integer

Print "&h" + Hex( MyDll_Data )

' Output:

' &h1234

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Category: Modularizing
Kind: keyword

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Reproduced from the FreeBASIC Wiki Manual under the GNU Free Documentation License 1.3 — with no Invariant Sections, no Front-Cover Texts and no Back-Cover Texts. Copyright © the FreeBASIC project and wiki contributors. See License.