How functions are imported and exported in a module?

Importing functions - Importing a function from other module is done by placing the function entry in function list of .IDATA section. MS VC++ compiler has specific keyword __declspec(dllimport) to import a function or variable from an external module.

Syntax:
Functions: __declspec(dllimport) <function prototype>;
Variables: __declspec(dllimport) <type definition>;

Example:

__declspec(dllimport) int extrn_var;
__declspec(dllimport) int Function1(int a);

Exporting functions - Exporting a function from a module is done by placing the function entry in function list of .EDATA section. MS VC++ compiler has specific keyword __declspec(dllexport) to export a function or variable from a module.

Syntax:
Functions: __declspec(dllexport) <function prototype>;
Variables: __declspec(dllexport) <type definition>;

Example:
__declspec(dllexport) int extrn_var;
__declspec(dllexport) int Function1(int a);

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