apSearch Example not working

[Doogle]

Hi all,

Had a play with this demo and it wouldn't work. It kept reporting the selected SSID as Null and therefore failed to connect. I'm no C wizard but I think that the variable ap's scope was a bit confusing as it was passed into and out of Function findAP bearing in mind that Function also declared ap as a local variable.

There's probably a much simpler resolution than the one I implemented, that is to make a Global variable (Global_Ap) and not pass it between Functions.

Code: Select all

/*---------------------------------------------------------------------------------

	Simple wifi demo to locate and connect to an ap
	-- dovoto
	Modified by Doogle 20/12/2008 - Made Wifi_AccessPoint Global rather than
	pass pointers to and from Functions

---------------------------------------------------------------------------------*/
#include <nds.h>
#include <stdio.h>
#include <dswifi9.h>

#include <sys/types.h>
#include <netinet/in.h>

#include <sys/socket.h>
#include <netdb.h>

Wifi_AccessPoint Global_Ap;

//---------------------------------------------------------------------------------
void findAP() {
//---------------------------------------------------------------------------------

	int selected = 0;  
	int i;
	int count = 0;

	Wifi_ScanMode(); //this allows us to search for APs

	while(!(keysDown() & KEY_A)) {
		scanKeys();

		//find out how many APs there are in the area
		count = Wifi_GetNumAP();

		consoleClear();

		iprintf("Number of APs found: %d\n", count);

		//display the APs to the user
		for(i = 0; i < count; i++) {

			Wifi_GetAPData(i, &Global_Ap);

			// display the name of the AP
			iprintf("%s %s\n", i == selected ? "*" : " ", Global_Ap.ssid);

		}

		//move the selection asterick
		if(keysDown() & KEY_UP && selected >0 ) selected--;

		if(keysDown() & KEY_DOWN && selected < (count-1)) selected++;

		swiWaitForVBlank();
	}

	//user has made a choice so grab the ap and return it
	Wifi_GetAPData(selected, &Global_Ap);

}

//---------------------------------------------------------------------------------
void keyPressed(int c){
//---------------------------------------------------------------------------------
	if(c > 0) iprintf("%c",c);
}


//---------------------------------------------------------------------------------
int main(void) {
//---------------------------------------------------------------------------------

	int status = ASSOCSTATUS_DISCONNECTED;

	consoleDemoInit(); 

	Keyboard* kb = keyboardGetDefault();
	kb->OnKeyPressed = keyPressed;
	keyboardInit(kb);

	Wifi_InitDefault(false);

	findAP();
		
	iprintf("Connecting to %s\n", Global_Ap.ssid);

	//this tells the wifi lib to use dhcp for everything
	Wifi_SetIP(0,0,0,0,0);	

	Wifi_ConnectAP(&Global_Ap, WEPMODE_NONE, 0, 0);

	while(status != ASSOCSTATUS_ASSOCIATED && status != ASSOCSTATUS_CANNOTCONNECT) {
		int oldStatus = status;

		status = Wifi_AssocStatus();

		iprintf("%s", oldStatus != status ? ASSOCSTATUS_STRINGS[status] : ".");
	
		swiWaitForVBlank();
	}

	consoleClear();
	consoleSetWindow(NULL, 0,0,32,10);

	char url[256];

	while(1)
	{
		iprintf("Url? ");

		scanf("%s", url);

		struct hostent *host = gethostbyname(url);
		
		if(host)
			iprintf("IP (%s) : %s\n",  url, inet_ntoa(*(struct in_addr *)host->h_addr_list[0]));
		else
			iprintf("Could not resolve\n");
	
		swiWaitForVBlank();
	}

	return 0;
}