How to correctrly create and read the pointer to array of structures in node-ffi












0















Node-ffi has lack of documentation



I am trying to use this function https://docs.microsoft.com/en-us/windows/desktop/api/ras/nf-ras-rasenumconnectionsw



const ffi = require( 'ffi-napi' );

const ref = require( 'ref' );



var myobj = ref.types.void;

var myobjPtr = ref.refType( myobj );

var myobjPtrPtr = ref.refType( myobjPtr );

var long1 = ref.refType( 'long' );

var long2 = ref.refType( 'long' );



var firstVar = ref.alloc( myobjPtrPtr );

var longVar1 = ref.alloc( 'long' );

var longVar2 = ref.alloc( 'long' );



let ras = new ffi.Library( 'Rasapi32.dll', {

  'RasEnumConnectionsW': [

    'long', // Return value - DWORD

    [ // Arguments

      // Pointer to a buffer that receives, on output, an array of RASCONN structures,

      // one for each RAS connection.

      myobjPtrPtr, // LPRASCONNW



      // Pointer to a variable that, on input, contains the size, in bytes, of the buffer

      // specified by lprasconn.

      long1, // LPDWORD



      // Pointer to a variable that receives the number of RASCONN structures written to

      // the buffer specified by lprasconn.

      long2 // LPDWORD

    ]

  ]

});



ras.RasEnumConnectionsW( firstVar, longVar1, longVar2 );



console.log( ref.deref( firstVar ) );


Right now node-ffi gives be UintArray8. Not array of strings, not array of objects






node.js winapi node-ffi







share|improve this question




















  • 1





    You're meant to provide a buffer (of a size that you choose and specify) for the information to be returned in. It looks like you're just passing an uninitialised pointer.

    – Jonathan Potter
    Nov 21 '18 at 11:28
















0















Node-ffi has lack of documentation



I am trying to use this function https://docs.microsoft.com/en-us/windows/desktop/api/ras/nf-ras-rasenumconnectionsw



const ffi = require( 'ffi-napi' );

const ref = require( 'ref' );



var myobj = ref.types.void;

var myobjPtr = ref.refType( myobj );

var myobjPtrPtr = ref.refType( myobjPtr );

var long1 = ref.refType( 'long' );

var long2 = ref.refType( 'long' );



var firstVar = ref.alloc( myobjPtrPtr );

var longVar1 = ref.alloc( 'long' );

var longVar2 = ref.alloc( 'long' );



let ras = new ffi.Library( 'Rasapi32.dll', {

  'RasEnumConnectionsW': [

    'long', // Return value - DWORD

    [ // Arguments

      // Pointer to a buffer that receives, on output, an array of RASCONN structures,

      // one for each RAS connection.

      myobjPtrPtr, // LPRASCONNW



      // Pointer to a variable that, on input, contains the size, in bytes, of the buffer

      // specified by lprasconn.

      long1, // LPDWORD



      // Pointer to a variable that receives the number of RASCONN structures written to

      // the buffer specified by lprasconn.

      long2 // LPDWORD

    ]

  ]

});



ras.RasEnumConnectionsW( firstVar, longVar1, longVar2 );



console.log( ref.deref( firstVar ) );


Right now node-ffi gives be UintArray8. Not array of strings, not array of objects






node.js winapi node-ffi







share|improve this question




















  • 1





    You're meant to provide a buffer (of a size that you choose and specify) for the information to be returned in. It looks like you're just passing an uninitialised pointer.

    – Jonathan Potter
    Nov 21 '18 at 11:28














0












0








0








Node-ffi has lack of documentation



I am trying to use this function https://docs.microsoft.com/en-us/windows/desktop/api/ras/nf-ras-rasenumconnectionsw



const ffi = require( 'ffi-napi' );

const ref = require( 'ref' );



var myobj = ref.types.void;

var myobjPtr = ref.refType( myobj );

var myobjPtrPtr = ref.refType( myobjPtr );

var long1 = ref.refType( 'long' );

var long2 = ref.refType( 'long' );



var firstVar = ref.alloc( myobjPtrPtr );

var longVar1 = ref.alloc( 'long' );

var longVar2 = ref.alloc( 'long' );



let ras = new ffi.Library( 'Rasapi32.dll', {

  'RasEnumConnectionsW': [

    'long', // Return value - DWORD

    [ // Arguments

      // Pointer to a buffer that receives, on output, an array of RASCONN structures,

      // one for each RAS connection.

      myobjPtrPtr, // LPRASCONNW



      // Pointer to a variable that, on input, contains the size, in bytes, of the buffer

      // specified by lprasconn.

      long1, // LPDWORD



      // Pointer to a variable that receives the number of RASCONN structures written to

      // the buffer specified by lprasconn.

      long2 // LPDWORD

    ]

  ]

});



ras.RasEnumConnectionsW( firstVar, longVar1, longVar2 );



console.log( ref.deref( firstVar ) );


Right now node-ffi gives be UintArray8. Not array of strings, not array of objects






node.js winapi node-ffi







share|improve this question
















Node-ffi has lack of documentation



I am trying to use this function https://docs.microsoft.com/en-us/windows/desktop/api/ras/nf-ras-rasenumconnectionsw



const ffi = require( 'ffi-napi' );

const ref = require( 'ref' );



var myobj = ref.types.void;

var myobjPtr = ref.refType( myobj );

var myobjPtrPtr = ref.refType( myobjPtr );

var long1 = ref.refType( 'long' );

var long2 = ref.refType( 'long' );



var firstVar = ref.alloc( myobjPtrPtr );

var longVar1 = ref.alloc( 'long' );

var longVar2 = ref.alloc( 'long' );



let ras = new ffi.Library( 'Rasapi32.dll', {

  'RasEnumConnectionsW': [

    'long', // Return value - DWORD

    [ // Arguments

      // Pointer to a buffer that receives, on output, an array of RASCONN structures,

      // one for each RAS connection.

      myobjPtrPtr, // LPRASCONNW



      // Pointer to a variable that, on input, contains the size, in bytes, of the buffer

      // specified by lprasconn.

      long1, // LPDWORD



      // Pointer to a variable that receives the number of RASCONN structures written to

      // the buffer specified by lprasconn.

      long2 // LPDWORD

    ]

  ]

});



ras.RasEnumConnectionsW( firstVar, longVar1, longVar2 );



console.log( ref.deref( firstVar ) );


Right now node-ffi gives be UintArray8. Not array of strings, not array of objects






node.js winapi node-ffi




node.js winapi node-ffi






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 21 '18 at 10:49







Rustam

















asked Nov 21 '18 at 10:06









RustamRustam

1,49911332




1,49911332








  • 1





    You're meant to provide a buffer (of a size that you choose and specify) for the information to be returned in. It looks like you're just passing an uninitialised pointer.

    – Jonathan Potter
    Nov 21 '18 at 11:28














  • 1





    You're meant to provide a buffer (of a size that you choose and specify) for the information to be returned in. It looks like you're just passing an uninitialised pointer.

    – Jonathan Potter
    Nov 21 '18 at 11:28








1




1





You're meant to provide a buffer (of a size that you choose and specify) for the information to be returned in. It looks like you're just passing an uninitialised pointer.

– Jonathan Potter
Nov 21 '18 at 11:28





You're meant to provide a buffer (of a size that you choose and specify) for the information to be returned in. It looks like you're just passing an uninitialised pointer.

– Jonathan Potter
Nov 21 '18 at 11:28












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