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Calling a Win DLL from C#

I am trying to call an LDAP function from the WLDAP32 dll (which I cannot add a reference to since its umanaged code). Can someone tell me how to do this. I think I have to match the parameters to an equivalent in C# here is what the C++ function looks like:

ULONG ldap_simple_bind(
__in LDAP* ld,
__in PCHAR dn,
__in PCHAR passwd
);

So how can I use the dll to call this function and use it in my C# application??

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Jaime Olivares

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npl77

ASKER

here is a code snippet in C++ can you recreate the code in C#

int main(int argc, char* argv[])
{
	// LDAP session handler.
	LDAP 	*p_ld=NULL;
 
	int intRC = 0;
 
	// Get server name/ip from user.
	char server[30];
	printf("LDAP Server:");
	scanf("%s", server);
 
	// Get server port from user.
	int port;
	printf("Port #:");
	scanf("%d", &port);
 
	printf("Try to connect to %s on port number %d...\n", server, port);
 
	// Connecting to server.
	if ((p_ld = ldap_open(server, port)) == NULL)
	{
		printf("Failed to open connection to LDAP server.\n");
	}
	else
	{
		printf("Connected to LDAP server.\n");
		
		// Search result handler
		LDAPMessage *p_ldResults=NULL;
 
		// Get search base from user.
		char searchbase[256];
		printf("Search Base: ");
		scanf("%s", searchbase);
 
		// Get search filter from user.
		char filter[256];
		//printf("Search filter: ");
		//scanf("%s", filter);
 
		char userid[30];
		printf("User ID: ");
		scanf("%s", userid);
 
		char userpwd[35];
		printf("Password: ");
		scanf("%s", userpwd);
 
		sprintf(filter, "(uid=%s)", userid);
 
		// Search
		intRC = ldap_search_s(
								p_ld,
								searchbase,
								LDAP_SCOPE_SUBTREE,
								filter,
								NULL,
								0,
								&p_ldResults
							);
 
		// Retrive the results
		if (intRC == LDAP_SUCCESS)
		{
			if (p_ldResults == NULL)
			{
				printf("No results found.\n");
			}
			else
			{
				// Find out the number of entries in the result.
				int intCount = (int)ldap_count_entries(p_ld, p_ldResults);
 
				// Make sure we found 1 and only one.
				if (intCount > 1)
				{
					printf("Too many matching entry.\n");
				}
				else
				{
					if (intCount == 1)
					{
						// Try to get the user dn.
						LDAPMessage *p_ldEntry=NULL;	
						char *p_dn=NULL;
 
						p_ldEntry = ldap_first_entry(p_ld, p_ldResults);
 
						if (p_ldEntry != NULL)
						{
							p_dn = ldap_get_dn(p_ld, p_ldEntry);
 
							if (p_dn != NULL)
							{
								// Authenticating user.
								printf("Authenticating user...\n");
 
								intRC = ldap_simple_bind_s(p_ld, p_dn, userpwd);
 
								if (intRC == LDAP_SUCCESS)
									printf("Successful\n");
								else
									printf("Failed\n");
 
								// Must do this.
								ldap_memfree(p_dn);
							}
							else
							{
								printf("Failed to retrieve user DN.\n");
							}
 
						}
						else
						{
							printf("Failed to retrieve user entry.\n");
						}
					}
					else
					{
						printf("Cannot find user.\n");
					}
				}
			}
		}
		else
		{
			printf("Failed to execute search operation. Error code %d\n", intRC);
		}
 
		// Must do this.
		if (p_ldResults)
			ldap_msgfree(p_ldResults);
								
	}
 
	// Close the connection.
	ldap_unbind(p_ld);	
 
	return 0;
}

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