C # reference DLL files written by other programs

 

When we use C # To Call DLL files written by Delphi or Vc, if they are not COM + type DLL files, we need to use the form of hosting to call them.

For example:

[Dllimport ("sccard. dll", callingconvention = callingconvention. stdcall)]
Public static extern int gercard (string pconnect, int count, int ID); // convert the method signature in the DLL file to C # type

 

Pay attention to the DLL file path:

Dllimport will automatically go to the desired location in order:
1. Directory of exe
2. system32 directory
3. Environment Variable directory

For C/S applicationsProgramThen, you can directly put it in the directory where the EXE is located.

If it is a B/S program, it should be placed in the System32 directory.