Probleme pour recuperer le HDEVINFO d'une clef USB

Bonsoir
A la la suite de cette discution j'ai essaye de tester un cable convertisseur USB //

Citation:

http://www.developpez.net/forums/sho...d.php?t=563074

J'ai donc recupere des exemples et commence les testes, je n'ai aucune erreur mais mon HDEVINFO et systematiquement negatif, je ne vois pas ou se trouve l'erreur voici le code

Code:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
 
//---------------------------------------------------------------------------
#include <vcl.h>
#pragma hdrstop
#include "Unit1.h"
#include <setupapi.h> // ne pas oublier
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
{
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button1Click(TObject *Sender)
{
// ClassGuid  {36FC9E60-C465-11CF-8056-444553540000}
GUID GUID_DEVINTERFACE_USBPRINT = {0x36FC9E60, 0xC465, 0x11CF, {0x80, 0x56, 0x44, 0x45, 0x53, 0x54, 0x00, 0x00}};
HDEVINFO hDevInfo;
GUID hIdGuid;
  hIdGuid = GUID_DEVINTERFACE_USBPRINT;
  hDevInfo = SetupDiGetClassDevs(&hIdGuid, NULL, NULL, (DIGCF_PRESENT | DIGCF_DEVICEINTERFACE));
        if (hDevInfo == INVALID_HANDLE_VALUE)
        {
        return; // je passe systematiquement ici
        }
}
//---------------------------------------------------------------------------

//--------------------------------------------------------------------------- #include <vcl.h> #pragma hdrstop #include "Unit1.h" //--------------------------------------------------------------------------- #pragma package(smart_init) #pragma resource "*.dfm" TForm1 *Form1; //--------------------------------------------------------------------------- __fastcall TForm1::TForm1(TComponent* Owner) : TForm(Owner) { } //--------------------------------------------------------------------------- void __fastcall TForm1::Button1Click(TObject *Sender) { // "\\\\?\\USB#Vid_04b8&Pid_0005#0HL550305090351140#{28d78fad-5a12-11d1-ae5b-0000f803a8c2}" // "\\\\?\\USB#Vid_067b&Pid_2305#5&36c701f9&0&10#{a5dcbf10-6530-11d2-901f-00c04fb951ed}" HANDLE handle = CreateFile( "\\\\?\\USB#Vid_067b&Pid_2305#5&36c701f9&0&10#{a5dcbf10-6530-11d2-901f-00c04fb951ed}", FILE_READ_DATA | FILE_WRITE_DATA, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL ); DWORD written; unsigned char command[1]; command[ 0 ] = StrToInt(Edit1->Text); // 0 à 255 WriteFile( handle, command, 1, &written, NULL ); CloseHandle( handle ); } //---------------------------------------------------------------------------