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.

Example

/* 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



Dialect Differences

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

Differences from QB

  • New to FreeBASIC

See also