Static and Dynamic DLL loading [Sample Code]

1. dllSource code

Mydll. h

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1. //////////////////////// //////////////////////////////////////// /// //
2. // mydll. H
3. // declare a function
4. int _ stdcall add ( int , int B);
5. int _ stdcall sub ( int , int B);

//////////////////////////////////////// /// // <Br/> // mydll. h <br/> // declare the function <br/> int _ stdcall add (int A, int B); <br/> int _ stdcall sub (int, int B );

 

Mydll. cpp

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2. //////////////////////////////////////// //////////////////////////////////
4. // Mydll. PP
6. // Declaration implementation
8. # Include "mydll. H"
10. Int_ Stdcall add (IntA,IntB)
12. {
14. ReturnA + B;
16. }
18. Int_ Stdcall sub (IntA,IntB)
20. {
22. ReturnA-B;
24. }

//////////////////////////////////////// /// // <Br/> // mydll. PP <br/> // Declaration implementation <br/> # include "mydll. H "<br/> int _ stdcall add (int A, int B) <br/>{< br/> return A + B; <br/>}< br/> int _ stdcall sub (int A, int B) <br/>{< br/> return a-B; <br/>}

 

Mydll. Def

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1. Mydll is the project name
2. Library mydll
3. Declare the function to be exported here
4. Exports
5. Add
6. Sub

; Mydll is the project name <br/> library mydll <br/>; declare the function to be exported here <br/> exports <br/> Add <br/> sub

 

2. EXE TestingCode

Demonstrate the dynamic and static loading methods. Check the code!

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2. VoidCtestdlg: onbtnstatic ()
4. {
6. // Todo: add your control notification handler code here
8. // Static Loading Method:
10. // 1. Add the header file # include "mydll. H"
12. // 2. Introduce the Lib library # pragma comment (Lib, "mydll. lib ")
14. // 3. You can directly use the function imported in mydll. h.
16. Cstring STR;
18. Str. Format ("Static Loading: 1 + 1 = % d 1-1 = % d", Add (1, 1), sub (1, 1 ));
20. MessageBox (STR );
22. }
24. VoidCtestdlg: onbtndynamic ()
26. {
28. // Todo: add your control notification handler code here
30. // Dynamic Loading Method:
32. // The header file and Lib file do not need to be introduced. Only one DLL is required.
34. // Note the Treaty call conventions here _ stdcall do not forget to add (otherwise ESP errors will be introduced)
38. Typedef Int(_ Stdcall * addproc )(Int,Int);
40. Typedef Int(_ Stdcall * subproc )(Int,Int);
42. HinstanceHandle;
44. Handle = loadlibrary ("Mydll. dll");
46. If(Handle)
48. {
50. // The second getprocaddress parameter has two methods:
52. // 1. Use the function name in the DLL
54. // 2. Check the ordinal index value in the depend tool.
56. Addproc myadd = (addproc) getprocaddress (handle,"Add");
58. Subproc mysub = (addproc) getprocaddress (handle, makeintresource (2 ));
60. If(! Myadd)
62. {
64. MessageBox ("An error occurred while obtaining the function add address! ");
66. Return;
68. }
70. If(! Mysub)
72. {
74. MessageBox ("An error occurred while obtaining the Function Sub address! ");
76. Return;
78. }
80. Cstring STR;
82. Str. Format ("Dynamic Loading: 1 + 1 = % d 1-1 = % d", Myadd (1, 1), mysub (1, 1 ));
84. MessageBox (STR );
86. }
88. Freelibrary (handle );
90. }