using a DLL

[nabeels786]

i have a DLL i wanna use, i think i remember seeing a way of adding the DLL sorta like a header file..do you guys know (u prolly do )

i wanna use "icmp.dll" in the windows dir..i dont wanna go through and have to use MFC to use the ping stuff

thanks
-nabeel

[chilibean]

This is a sample from MSDN and may be what you're looking for...

Note that the code is not complete and will not run, but you can adapt it into your program. Look at the documentation for LoadLibrary for more info.

typedef UINT (CALLBACK* LPFNDLLFUNC1)(DWORD,UINT);
.
.
.
HINSTANCE hDLL;               // Handle to DLL
LPFNDLLFUNC1 lpfnDllFunc1;    // Function pointer
DWORD dwParam1;
UINT  uParam2, uReturnVal;

hDLL = LoadLibrary("MyDLL");
if (hDLL != NULL)
{
   lpfnDllFunc1 = (LPFNDLLFUNC1)GetProcAddress(hDLL,
                                           "DLLFunc1");
   if (!lpfnDllFunc1)
   {
      // handle the error
      FreeLibrary(hDLL);       
      return SOME_ERROR_CODE;
   }
   else
   {
      // call the function
      uReturnVal = lpfnDllFunc1(dwParam1, uParam2);
   }
} 

[nabeels786]

thanks...ill play around with it and see if i can get it to work

[parksie]

Try this

[amac]

What can be exported from a DLL?

[Wynd]

Originally posted by chilibean

typedef UINT (CALLBACK* LPFNDLLFUNC1)(DWORD,UINT); 

What does this line do?

[amac]

It is defining the type of LPFNDLLFUNC1... which happens to be a pointer to a function which returns an UINT and recieves a DWORD, and a UINT... which also uses the calling convention CALLBACK ( not sure what this macro is defined as )

[nabeels786]

thanks parksie


but i get these errors:

c:\program files\microsoft visual studio\vc98\include\icmpapi.h(148) : error C2061: syntax error : identifier 'IPAddr'
c:\program files\microsoft visual studio\vc98\include\icmpapi.h(237) : error C2061: syntax error : identifier 'IPAddr'

any ideas? i added "icmp.lib"

i get it at

DWORD
WINAPI
IcmpSendEcho(
    HANDLE                   IcmpHandle,
    IPAddr                   DestinationAddress,
    LPVOID                   RequestData,
    WORD                     RequestSize,
    PIP_OPTION_INFORMATION   RequestOptions,
    LPVOID                   ReplyBuffer,
    DWORD                    ReplySize,
    DWORD                    Timeout
    ); 

[parksie]

Try this - you'll need windows.h as well.

[nabeels786]

still no luck

still says

c:\program files\microsoft visual studio\vc98\include\icmpapi.h(150) : error C2061: syntax error : identifier 'IPAddr'

windows.h, the header you gave me is also added.

i downloaded the platform sdk also to see if that maybe had it, no luck

any other ideas?

thanks
-nabeel

[parksie]

Do a full-text search in your PSDK include folder to find where it is - it's definitely defined somewhere because I found it.

[nabeels786]

nope, couldn't find it

[nabeels786]

ahh nevermind, found it..

all that trouble for

typedef ULONG IPAddr;       // An IP address. 

pfft

[parksie]

Somebody kick MS