How can you create a dll file?

Answer 1

Steps to Create Your First DLL

• Create a Win32 Dynamic Link Library project, adding a *.cpp and a *.h file.
• In the *.cpp file, create a class instantiated from the CWinApp file. Collapse | Copy Code

  # include # include "SourceFile.h" class CDllApp : public CWinApp { public: CDllApp::CDllApp() { Calc(0,0); } DECLARE_MESSAGE_MAP() }; BEGIN_MESSAGE_MAP(CDllApp,CWinApp) END_MESSAGE_MAP() CDllApp DllObject;

• In the *.h file (here it is SourceFile.h), define the functions to be used. Also specify the dllexport value for the _declspec function. Collapse | Copy Code

  extern "C" _declspec(dllexport) int Calc(char no1,char no2) { char result; result = no1 + no2; return result; }

• Then compile the DLL.
• Create a normal Win32 Application with a *.cppfile and a *.h file.
• In the *.h file, (here it is AppHeader.h ), declare the function with the dllimport value of _declspec. Collapse | Copy Code

  extern "C" _declspec(dllimport) Calc(int FirstValue, int SecondValue);

• In the *.cpp file, use the function. Collapse | Copy Code

  # include "AFXWIN.H" # include "AppHeader.h" class MainFrame : public CFrameWnd { public: MainFrame() { Create(0,"Trial"); } void OnLButtonDown(UINT nFlags,CPoint point) { int res; char str[5]; res = Calc(998,226); sprintf(str,"%d",res); MessageBox(str); } DECLARE_MESSAGE_MAP() };

• In the Link tab of the "Project->Settings" dialog, go to the text box labeled "Object / Library Modules" and specify the path of the DLL file. Then copy the compiled DLL file to your current appliation path directory and run the program.

Answer 2

you can follows this step :

click on Start and then click on Run.

you will input in the Run field a command that tells your computer to register the DLL file. You will need to input specific information including the path and the file name. The following is a template for the command: regsvr32 "\FileName.dll"

It is important to note that path is the actually location or directory of where the file is located. File name is obviously the name of the DLL file you will be registering. Below is a sample command: Regsvr32 "C:\Windows\System32\example.dll"

Once the command is input into the Run field correctly, press Enter.

Once the DLL has been registered, you should receive a confirmation in the form of a pop up box. This message will list your newly registered DLL file and confirm that is was successfully registered into the registry