Detecting USB insertion/Removal in C++ non-GUI application

Question

I want to detect insertion/removal of a specific (Custom) USB device through a C++ application which runs in background and has no GUI.

I have seen lot of questions

Answer 1

External USB Storage Device Detector

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This program (C++) detects pen drive, memory card & external hard drive (whenever a new USB storage device is inserted)-

#include 
#include 
#include 
#include 

using namespace std;

string allDrives;

char getRemovableDisk();

int main(void){

    char driveLetter = getRemovableDisk();
    while(1){
        driveLetter = getRemovableDisk();
        if(driveLetter!='0'){
            printf("%c \n", driveLetter);
        }

        Sleep(1000);
    }

    return 0;
}

char getRemovableDisk(){
    char drive='0';

    char szLogicalDrives[MAX_PATH];
    DWORD dwResult = GetLogicalDriveStrings(MAX_PATH, szLogicalDrives);

    string currentDrives="";

    //cout << dwResult << endl;
    for(int i=0; i64 && szLogicalDrives[i]< 90)
        {
            currentDrives.append(1, szLogicalDrives[i]);

            if(allDrives.find(szLogicalDrives[i]) > 100)
            {
                drive = szLogicalDrives[i];
            }
        }
    }

    allDrives = currentDrives;

    return drive;
}

Remark: This code snippet can detect only one new device (even if more than one is inserted at once). But, of course, you can achieve multiple detection too, with a little change. :)