Creating network device - c++

Question

here is my code:
#include <windows.h>
#include <winerror.h>
#include <Winbase.h>
#include <Shlwapi.h>
#include <Setupapi.h>
#include <stdio.h>
typedef BOOL WINAPI (*InstallSelectedDriverProto)(HWND, HDEVINFO, LPCTSTR, BOOL, PDWORD);
int main()
{
InstallSelectedDriverProto InstallSelectedDriver;
static const int MAX_NAME = 256;
HDEVINFO devs = INVALID_HANDLE_VALUE;
char infPath[260] = {0};
char deviceId[260] = {0};
DWORD reboot = 0;
HMODULE newDll = NULL;
int devNameSize = 260;
GUID classGUID = {0};
char ClassName[MAX_NAME] = {0};
char hwIdList[LINE_LEN + 4] = {0};
SP_DEVINFO_DATA deviceData = {0};
SP_DRVINFO_DATA driverInfoData = {sizeof(SP_DRVINFO_DATA)};
const char *hwid;
char *devName = NULL;
hwid = "net";
char *inf;
inf = "C:\\Program Files (x86)\\Infs\\net.inf";
strncpy(infPath, inf, sizeof(infPath)-1);
infPath[sizeof(infPath)-1] = '\0';
memset(hwIdList, 0, sizeof(hwIdList));
strcpy(hwIdList, hwid);
if (SetupDiGetINFClass(infPath, &classGUID,
ClassName, MAX_NAME, 0) == FALSE)
{
printf("SetupDiGetINFClass failed. %d\n", GetLastError());
fflush(stdout);
}
devs = SetupDiCreateDeviceInfoList(&classGUID, 0);
if (devs == INVALID_HANDLE_VALUE)
{
printf("devs == INVALID_HANDLE_VALUE.\n");
fflush(stdout);
}
deviceData.cbSize = sizeof(SP_DEVINFO_DATA);
if (devName == NULL || devName[0] == 0)
{
if (SetupDiCreateDeviceInfo(devs, hwid, &classGUID, NULL, 0,
DICD_GENERATE_ID, &deviceData) == FALSE)
{
printf("SetupDiCreateDeviceInfo failed. %d\n", GetLastError());
fflush(stdout);
}
}
else
{
strcpy(deviceId, "Root\\");
strcat(deviceId, ClassName);
strcat(deviceId, "\\");
strcat(deviceId, devName);
if (SetupDiCreateDeviceInfo(devs, deviceId, &classGUID,
NULL, 0, 0, &deviceData) == FALSE)
{
printf("SetupDiCreateDeviceInfo failed. %d\n", GetLastError());
fflush(stdout);
}
}
if (SetupDiSetDeviceRegistryProperty(devs, &deviceData,
SPDRP_HARDWAREID, (BYTE *) hwIdList,
(strlen(hwIdList) + 2)) == FALSE)
{
printf("SetupDiSetDeviceRegistryProperty failed. %d\n", GetLastError());
fflush(stdout);
}
if (SetupDiCallClassInstaller(DIF_REGISTERDEVICE,
devs, &deviceData) == FALSE)
{
printf("SetupDiCallClassInstaller failed. %d\n", GetLastError());
fflush(stdout);
}
newDll = LoadLibrary("newdesv.dll");
if (newDll == NULL)
{
printf("newDll == NULL.\n");
fflush(stdout);
}
InstallSelectedDriver = (InstallSelectedDriverProto) GetProcAddress(newDll, "InstallSelectedDriver");
if (InstallSelectedDriver == NULL)
{
printf("InstallSelectedDriver == NULL failed. %d\n", GetLastError());
fflush(stdout);
}
if (SetupDiSetSelectedDevice(devs, &deviceData) == FALSE)
{
printf("SetupDiSetSelectedDevice failed. %d\n", GetLastError());
fflush(stdout);
}
if (SetupDiBuildDriverInfoList(devs, &deviceData,
SPDIT_COMPATDRIVER) == FALSE)
{
printf("SetupDiBuildDriverInfoList failed. %d\n", GetLastError());
fflush(stdout);
}
if (SetupDiCallClassInstaller(DIF_SELECTBESTCOMPATDRV, devs,
&deviceData) == FALSE)
{
printf("SetupDiBuildDriverInfoList failed. %d\n", GetLastError());
fflush(stdout);
}
if (SetupDiGetSelectedDriver(devs, &deviceData,
&deviceData) == FALSE)
{
printf("SetupDiGetSelectedDriver failed. %d\n", GetLastError());
fflush(stdout);
}
if (InstallSelectedDriver(NULL, devs, NULL, TRUE, &reboot) == FALSE)
{
printf("InstallSelectedDriver failed. %d\n", GetLastError());
fflush(stdout);
}
if (devName && devNameSize > 0)
{
if (SetupDiGetDeviceInstanceId(devs, &deviceData,
devName, devNameSize, NULL) == FALSE)
{
printf("SetupDiGetDeviceInstanceId failed. %d\n", GetLastError());
fflush(stdout);
}
}
return 0;
}
What I'm trying to do is create a network device. I'm having Segmentation fault but don't know why. I can't paste the whole .inf file because it's University project but, it clearly has
[Version]
Signature = "$Windows NT$"
Class = Net
ClassGUID = {4d36e972-e325-11ce-bfc1-08002be10318}
I tried different things and noticed that SetupDiCreateDeviceInfo may be the problem, because I tried to delete the command and everything below it, and in that case everything works fine. Sorry if question is silly, I'm new with winapi. Thanks.
P.S
About the problem with SetupDiGetDeviceInstanceId, As I meantion in comments it gives me Segmentation fault, I even tried this version:
char *devName1 = NULL;
if (SetupDiGetDeviceInstanceId(devs, &deviceData,
devName1, devNameSize, NULL) == FALSE)
{
printf("SetupDiGetDeviceInstanceId failed. %d\n", GetLastError());
fflush(stdout);
}
Created separated variable and initialized, but it gives me same error.