how to create .msi package with serial number validation?

[ramcbe]

hello,
i am very new to vc++.i have the code.

#include "windows.h"
#include "stdafx.h"

// Need the following header files to access the MSI API

#include "msi.h"
#include "msiquery.h"
#pragma comment(lib, "msi.lib")

// Export the function so MSI can call it using undecorated C style name
extern "C" _declspec(dllexport) UINT __stdcall VerifyPID(MSIHANDLE hInstall);


// Private Function definitions
TCHAR* GetPIDValue(TCHAR*);

extern "C" UINT __stdcall VerifyPID(MSIHANDLE hInstall)
{
   // Local variables
   UINT    nRetVal = 0;
   UINT    uiMsiRc;
   TCHAR   szPidKey[MAX_PATH];
   TCHAR   szSourceDir[MAX_PATH];
   TCHAR*  lpszPidValue;
   DWORD   dwBuffer;

   // Get the source folder for the msi project
   dwBuffer = sizeof(szSourceDir)/sizeof(TCHAR);

   uiMsiRc = MsiGetProperty(hInstall, TEXT("SourceDir"), szSourceDir, &dwBuffer);

   if (ERROR_SUCCESS != uiMsiRc)
   {
      MessageBox(NULL, "Not able to retrieve the SourceDir property.  The setup may be corrupt.  Please contact Technical Support.", "Setup Error", MB_OK | MB_ICONEXCLAMATION);
      return 0;
   }
   
   // Call function to decrypt the PID to validate against from a file stored on setup media
   lpszPidValue = GetPIDValue(szSourceDir);

    // Get the PIDKEY property value entered by the user from the active msi
   dwBuffer = sizeof(szPidKey)/sizeof(TCHAR);
 
   uiMsiRc = MsiGetProperty(hInstall, TEXT("PIDKEY"), szPidKey, &dwBuffer);

   if (ERROR_SUCCESS != uiMsiRc)
   {
      MessageBox(NULL, "Not able to retrieve PIDKEY property.  The setup may be corrupt.  Please contact Technical Support.", "Setup Error", MB_OK | MB_ICONEXCLAMATION);
      return 0;
   }

   //Insert code to check PIDKEY here
   int str = lstrcmp(szPidKey, lpszPidValue);

   //If PIDKEY passes check
   if (str == 0)
      MsiSetProperty(hInstall, "PIDCHECK", "TRUE");
   //If PIDKEY doesn't pass check
   else
   {
      MsiSetProperty(hInstall, "PIDCHECK", "FALSE");
      MessageBox(NULL, "Please enter the correct product registration code!", "Invalid Key", MB_OK | MB_ICONINFORMATION);
   }

   return 0;
}

// GetPIDValue is used to locate and decrypt a key file on the setup media
//  that contains the PID string to validate against.

TCHAR* GetPIDValue(TCHAR* lpszSourceDir)
{
	// lpszSourceDir contains the fully qualified path to the location where the setup is running.  
	// For example, suppose the msi is located on a CD in the folder "\Setup\MySetup.msi".
	// The user is running the CD in the D: drive.  
	// lpszSourceDir will have a value of "D:\Setup\".  
	// Note that the trailing slash is included!

	// TO DO: Concatenate key file path, example lpszSourceDir + "MyKeyFile.dat"
	// TO DO: Read key file from source media
	// TO DO: Code decryption algorithm for key file
	// For this example, simply return a literal PID key of format <### - #######>
	
		return "123 - 4567890";
}

how can i attach "MyKeyFile. dat" which i given in comment line.

thanks in advance,