Implementing Wireless Print for WinNT/Win2K

Listing 3: wlsfnc.c
Source for wireless procedures. The functions prefixed with two underscores need further implementation based on technology

/*------------------------------------------------------------------
wlsfnc.c: Implement wireless communications, for WDJ article only
Note:     __WlsXxx functions need technology-based implementations
Author:   Zuoliu Ding
------------------------------------------------------------------*/
#include <windows.h>
#include "wlsmon.h"

#define __WlsFrmSize 240

typedef struct tag__WLS_HANDLE 
{  
    LPWSTR  pNetwork;
    LPWSTR  pNode1;
    LPWSTR  pNode2;

    WORD    wTmo;
    DWORD   dwStatus;

    // Other members...
} *__WLS_HANDLE;


HANDLE WlsConnectPrinter(LPWSTR pName, DWORD JobId)
{ 
    WCHAR wcs[256], wcs2[256];        
    __WLS_HANDLE wlsHnd;

    // Here do some sanitary check for network first...

    if (!(wlsHnd =__WlsOpenHandle()) // Allocate memory for handle 
        return NULL;

    RegReadPort(pName, wcs);        // Read settings from registry
    WORD wTmo =RegGetPortData(wcs); // Get prn node name and timeout
    
    __WlsGetLocalUserName(wsz2);    // Get PC node name
    __WlsSetNodeNames(wlsHnd, wsz2, wcs);
    wlsHnd->wTmo = wTmo;

    // Here set other data members before connection...
    if (!__WlsSetConnection(wlsHnd))  
    {
        // Here do cleanup...
        return NULL;
    }

    return  (HANDLE)wlsHnd;  
}                     

BOOL WlsWritePrinter(HANDLE hPrinter, 
                     LPBYTE pBuffer, DWORD cbBuf, LPDWORD pcbWrtn)
{    
    __WLS_HANDLE wlsHnd = (__WLS_HANDLE)hPrinter;

    DWORD    dwCurLen = cbBuf; 
    DWORD    dwFrmLen; 
    *pcbWrtn =0;
    
    // Here validate network and wlsHnd first...

    while (dwCurLen>0)
    {         
        dwFrmLen = dwCurLen< __WlsFrmSize ? dwCurLen: __WlsFrmSize; 
             
        if (!__WlsTransferFrame(wlsHnd, pBuffer, dwFrmLen)) 
        {
            // Here do cleanup...
            return FALSE;
        }
     
        dwCurLen     -= dwFrmLen;
        pBuffer         += dwFrmLen; 
        *pcbWrtn    += dwFrmLen;
    }                              
  
    return TRUE;
}

BOOL WlsDisconnectPrinter(HANDLE hPrinter)  
{
    __WLS_HANDLE wlsHnd = (__WLS_HANDLE)hPrinter;
    // Here validate wlsHnd and do some other cleanup...
    
    if (!__WlsTerminateConnection(wlsHnd)) return FALSE; 

    __WlsCloseHandle(wlsHnd);
    return TRUE;
}

void WlsGetPrinterData(HWND hwnd) 
{
    WCHAR  wsz[256]; 
    int i;

    __WlsGetNetworkName(wsz);
    SetDlgItemText(hwnd, IDD_CW_EDTNETWORK, wsz); 

    __WlsGetLocalUserName(wsz);
    SetDlgItemText(hwnd, IDD_CW_LOCALUNIT, wsz); 

    SendDlgItemMessage(hwnd, IDD_CW_LISTPRNS, LB_RESETCONTENT, 0,0);

    if (!__WlsGetFirstPrinter(wsz)) return;

    do     
    {   
        SendDlgItemMessage(hwnd, IDD_CW_LISTPRNS, 
                                 LB_ADDSTRING, 0, (LPARAM)wsz);
    }
    while (__WlsGetNextPrinter(wsz));
}

//End of file