## Creating an application that uses wpcap.dll

To create an application that uses wpcap.dll with Microsoft Visual C++, follow these steps:

- Include the file pcap.h at the beginning of every source file that uses the functions exported by library.
- If your program uses Win32 specific functions of WinPcap, remember to include WPCAP among the preprocessor definitions.
- Set the options of the linker to include the wpcap.lib library file. wpcap.lib can be found in the WinPcap developer's pack.
- Set the options of the linker to include the winsock library file (for example wsock32.lib). This file is distributed with the C compiler and contains the socket functions for Windows. It is needed by some libpcap functions.

Remember that:

- To add a preprocessor definition, you must select Settings from the Project menu, then select C/C++ from the tab control, and under the category General, you must add the definition under the Preprocessor Definitions text box.
- To add a new library to the project with Microsoft Visual C++, you must select Settings from the Project menu, then select Link from the tab control, and then add the name of the new library in the Objcet/library modules editbox.
- To add a new path where Microsoft Visual C++ will look for the libraries, you must select Options from the Tools menu, then Directories from the tab control, Library files from the Show directories for combobox, and the add the path in the Directories box.
- To add a new path where Microsoft Visual C++ will look for include files, you must select Options from the Tools menu, then Directories from the tab control, Include files from the Show directories for combobox, and the add the path in the Directories box.

## Sample programs

A couple of sample programs are provided to show the usage of the WinPcap API. The source of the examples, along with all the files needed to compile and run them, can be found in the Developer's Pack. For didactic purpose we provide here a browsable version of the code: it is possible to click on the variables and functions to jump the documentation of each of them. For a more complete set of samples, try WinPcap Tutorial Section.