How use from a Dll in our programs.

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Introduction

How use from a Dll in our programs.

this is  a good example for this task.

this Dll is programed by me.(Name of Dll is InfoWindows.dll )

in this Dll , I use from Four Fuctions.

that are : 

1. BOOL IsWindowsNT(void)
2. CString GetPathWindows(void)
3. CString GetPathSystem(void)
4. CString GetDriveCDrom(void)

1. Bool IsWindowsNT (void)

we can use this fuction to distinguish winNT from Win98.

2. CString GetPathWindows(void)

we can use this fuction to distinguish path of our installed windows.

3. CString GetPathSystem(void)

we can use this fuction to distinguish path of  system  folder.

4. CString GetDriveCDrom(void)

we can use this fuction to distinguish path of our CDrom.

Notice:

To useing Dll File we must be Copy Dll file into System Folder of our Windows.

See part of program together :

// UseInfoWindowsDllDlg.cpp : implementation file
// 
/////////////////////////////////////////////////
//
// Programmer : Behzad Bahjat Manesh .
// Date : 2005/06/06
// Email :Bahjatmanesh@gmail.com
//
// 
/////////////////////////////////////////////////

#include "stdafx.h"
#include "UseInfoWindowsDll.h"
#include "UseInfoWindowsDllDlg.h"
 
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static 
char THIS_FILE[] = __FILE__;
#endif
//----------Fuctions Dllfile----------

HINSTANCE gLibMyDLL =NULL;
typedef CString (*GETPATHWINDOWS) (void);
GETPATHWINDOWS 
GetPathWindows;

typedef CString (*GETPATHSYSTEM) (void);
GETPATHSYSTEM 
GetPathSystem;
 
typedef  BOOL (*ISWINDOWSNT) (void);
ISWINDOWSNT 
IsWindowsNT;

typedef CString (*GETDRIVECDROM) (void);
GETDRIVECDROM 
GetDriveCDrom;
 
//----------------------

For Load Dll File , Written this code into OnInitDialog() :

//****************Dll file*********
 
 if(gLibMyDLL != NULL)
 {
  MessageBox("The InfoWindows.Dll Dll has already been loaded");
   return 0;
 }
 gLibMyDLL=LoadLibrary("InfoWidows.dll");
 if(gLibMyDLL ==NULL)
 {
  char 
msg[300];
  strcpy(msg,"Cannot load the DLL");
  strcat(msg,"Make sure that the file DLL");
  strcat (msg,"is in your file://WINDOWS//SYSTEM directory.");
  MessageBox(msg);
 }
 GetPathWindows=(GETPATHWINDOWS) GetProcAddress (gLibMyDLL,"GetPathWindows");
 
 GetPathSystem=(GETPATHWINDOWS) GetProcAddress (gLibMyDLL,"GetPathSystem");
 
 IsWindowsNT=(ISWINDOWSNT) GetProcAddress (gLibMyDLL,"IsWindowsNT");
 GetDriveCDrom=(GETDRIVECDROM) GetProcAddress (gLibMyDLL,"GetDriveCDrom");
//*******************

Continue :

void CUseInfoWindowsDllDlg::OnButtonPathwindows() 
{
 // TODO: Add 
your control notification handler code here
 
   if(gLibMyDLL ==NULL)
 {
 MessageBox("You must first load The DLL 
file");
 return;
 }
m_str2=GetPathWindows();
UpdateData(0);
 
}