C++: some errors about const char* and printf - c++

Question

I found this code for reading data from my USB peripheral:
#include "stdafx.h"
#define IWEARDRV_EXPLICIT
#include <windows.h>
#include <iweardrv.h>
int _tmain(int argc, _TCHAR* argv[])
{
// Load functions dynamically (in case they don't have a VR920)
HINSTANCE iweardll = LoadLibraryA("iweardrv.dll");
if (!iweardll) {
printf("VR920 drivers are not installed, you probably don't have a VR920.");
return 2;
}
IWROpenTracker = (PIWROPENTRACKER) GetProcAddress(iweardll, "IWROpenTracker");
IWRCloseTracker = (PIWRCLOSETRACKER) GetProcAddress(iweardll, "IWRCloseTracker");
IWRZeroSet = (PIWRZEROSET) GetProcAddress(iweardll, "IWRZeroSet");
IWRGetTracking = (PIWRGETTRACKING) GetProcAddress(iweardll, "IWRGetTracking");
IWRGetVersion = (PIWRGETVERSION) GetProcAddress(iweardll, "IWRGetVersion");
// Try to connect to the VR920 tracker
if (IWROpenTracker()) {
printf("VR920 is not connected.");
return 1;
}
// Read 20 samples
for (int i=1; i<=20; i++) {
LONG y, p, r;
double yaw, pitch, roll;
if (!IWRGetTracking(&y,&p,&r)) {
yaw = y*(180.0/32768.0);
pitch = p*(180.0/32768.0);
roll = r*(180.0/32768.0);
printf("Yaw=%lf degrees, Pitch=%lf degrees, Roll=%lf degrees", yaw, pitch, roll);
} else {
printf("Unable to read tracking.");
}
Sleep(500);
}
// Tidy up
IWRCloseTracker();
FreeLibrary(iweardll);
return 0;
}
Where I've setted additional include directory for include file iweardrv.h. It returns me these errors:
IntelliSense: argument of type "const char *" is incompatible with parameter of type "LPCWSTR"
IntelliSense: identifier "printf" is undefined
How do I avoid the errors? First error refers to LoadLibrary argument "iweardrv.dll" (a dynamic Library related to iweardrv.h) and second error refers to all printf calling lines.
EDIT: I corrected the first error using LoadLibraryA() because it takes a const char* but I cannot correct the second error.

Answer 1

The first error is because you are compiling with UNICODE defined and LoadLibrary expects a wide string. Use the L prefix to specify a wide literal:
LoadLibrary(L"iweardrv.dll");
The second error is due to a missing #include. You need to include stdio.h to define printf:
#include <stdio.h>
For C++ it would be more normal to use std::cout rather than printf.