How to resolve the Winusb linking error?

Question

I've written a WinUSB project for obtaining data from spectrometer, the code seems to work few weeks ago. In the later stage I tried to link this project with CUDA, after few trials I solved the CUDA linker error. Unfortunately I ended up "error LNK2019: unresolved external symbol" in my main program(Winusb project). At first I thought it was because of the .cu files and I decided to remove all the .CU(CUDA)files form the project and still I was keep on getting the same error(LNK2019). The following is my code for Winusb project (which was working perfectly few weeks back, but now I'm completely lost and needed some help)

Main.cpp

#include "pch.h"
#include <cstdio>

LONG __cdecl _tmain(LONG  Argc, LPTSTR * Argv )
{   
FILE *output_file1 = fopen("output_file2.txt", "w");
//FILE *output_file2 = fopen("output_file3.txt", "w");
DEVICE_DATA           deviceData;
HRESULT               hr;
USB_DEVICE_DESCRIPTOR deviceDesc;
BOOL                  bResult;
BOOL                  noDevice;
ULONG                 lengthReceived;
BOOL wrResult = TRUE;
BOOL wr1Result = TRUE;
BOOL RQResult = 0;
UNREFERENCED_PARAMETER(Argc);
UNREFERENCED_PARAMETER(Argv);


//////////////////////Open device ///////////////
hr = OpenDevice(&deviceData, &noDevice);
if (FAILED(hr)) {
    if (noDevice) {
        printf(_T("Device not connected or driver not installed\n"));
    } else {
       printf(_T("Failed looking for device, HRESULT 0x%x\n"), hr);
    }
    std::getchar();
    return 0;
}

/////////////////////Get descriptor//////////////////
bResult = WinUsb_GetDescriptor(deviceData.WinusbHandle,
                               USB_DEVICE_DESCRIPTOR_TYPE,
                               0,
                               0,
                               (PBYTE) &deviceDesc,
                               sizeof(deviceDesc),
                               &lengthReceived);
   if (FALSE == bResult || lengthReceived != sizeof(deviceDesc)) {

    printf(_T("Error among LastError %d or lengthReceived %d\n"),
           FALSE == bResult ? GetLastError() : 0,
           lengthReceived);
    CloseDevice(&deviceData);
    return 0;
}

bool sResult = FALSE;bool syResult;
bool sResult1 = FALSE;bool syResult1;
//Initialize
UCHAR Intialize[] = {0x01};
ULONG cbISize = strlen((char*)Intialize);
ULONG InSent = 0;
wrResult = WinUsb_WritePipe(deviceData.WinusbHandle, 0x01, Intialize, 1, &InSent, 0);
//Integration time - 700ms
UCHAR Inttime[] = {0x0200100000};
ULONG cbITSize = strlen((char*)Inttime);
ULONG InttimeSent = 0;
wrResult = WinUsb_WritePipe(deviceData.WinusbHandle, 0x01, Inttime, 5, &InttimeSent, 0);
//strobe signal
UCHAR strobe1[] = {0x030001};
ULONG strobeSize1 = strlen((char*)strobe1);
ULONG strobeSent1 = 0;
wr1Result = WinUsb_WritePipe(deviceData.WinusbHandle, 0x01, strobe1, 3, &strobeSent1, 0);
//Request spectra
UCHAR Rqspectra[] = {0x09};
ULONG RqSize = strlen((char*)Rqspectra);
ULONG RqSent = 0;
RQResult = WinUsb_WritePipe(deviceData.WinusbHandle, 0x01, Rqspectra,1, &RqSent, 0);
//Pixel Values
UCHAR szBuffer[15][512];
UCHAR sz1Buffer[1];
UCHAR tBuffer[1];
ULONG tReadx;
ULONG cbReadx[16];
USHORT newbuf[15][512];
short specbu[7860];
for (int i=0;i<16;i++)
{
    if (i<4)
    {
        sResult = WinUsb_ReadPipe(deviceData.WinusbHandle,  0x86, szBuffer[i], 512, &cbReadx[i], 0);
    }
    else if (i>=4 && i<15)
    {
        sResult = WinUsb_ReadPipe(deviceData.WinusbHandle,  0x82, szBuffer[i], 512, &cbReadx[i], 0);
    }
    else if (i = 15)
    {
        syResult = WinUsb_ReadPipe(deviceData.WinusbHandle,  0x82, sz1Buffer, 1, &cbReadx[i], 0);
    }

}
int pon=0;
for (int k=0;k<15;k++)
{
for (int l=0;l<512;l+=2)
{
    newbuf[k][l] = (szBuffer[k][(l+1)]<<8|szBuffer[k][l]);
    specbu[pon]= (szBuffer[k][(l+1)]<<8|szBuffer[k][l]);
    fprintf(output_file1,"%d\t\n",specbu[pon]);
    pon++;

}
}
std::getchar();
CloseDevice(&deviceData);
return 0;
}

My Pch.h

#include <Windows.h>
#include <tchar.h>
#include <strsafe.h>
#include <winusb.h>
#include <usb.h>
#include "device.h"

My device.h #include

//
// Device Interface GUID.
// Used by all WinUsb devices that this application talks to.
// Must match "DeviceInterfaceGUIDs" registry value specified in the INF file.
// 390a138c-f867-4538-8fd4-46063b842d2b
//
DEFINE_GUID(GUID_DEVINTERFACE_USBApplication2,
0x390a138c,0xf867,0x4538,0x8f,0xd4,0x46,0x06,0x3b,0x84,0x2d,0x2b);

typedef struct _DEVICE_DATA {

BOOL                    HandlesOpen;
WINUSB_INTERFACE_HANDLE WinusbHandle;
HANDLE                  DeviceHandle;
TCHAR                   DevicePath[MAX_PATH];

}
DEVICE_DATA, *PDEVICE_DATA;
HRESULT
OpenDevice(
_Out_     PDEVICE_DATA DeviceData,
_Out_opt_ PBOOL        FailureDeviceNotFound
);

VOID
CloseDevice(
_Inout_ PDEVICE_DATA DeviceData
);

My build log

1>------ Build started: Project: USB Application2, Configuration: Win7 Debug Win32 ------
1>  main.cpp
1>main.obj : error LNK2019: unresolved external symbol "long __stdcall OpenDevice(struct _DEVICE_DATA *,int *)" (?OpenDevice@@YGJPAU_DEVICE_DATA@@PAH@Z) referenced in function _main
1>main.obj : error LNK2019: unresolved external symbol "void __stdcall CloseDevice(struct _DEVICE_DATA *)" (?CloseDevice@@YGXPAU_DEVICE_DATA@@@Z) referenced in function _main
1>C:\Users\bel1\Documents\Visual Studio 2012\Projects\USB Application2\Win7Debug\USBApplication2.exe : fatal error LNK1120: 2 unresolved externals
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
========== Deploy: 0 succeeded, 0 failed, 0 skipped ==========

Answer 1

You will need to add source files (.CPP) into your project that are having implementation of following functions:

• OpenDevice
• CloseDevice

If you are using a third party library, you need to put the relevant .LIB file into Linker Input of project settings.