Monitor a directory and call SyncToy if something changes.

Directory Monitor Execute.cpp

// This requires Windows XP or newer.

#include <stdio.h>
#include <tchar.h>
#include <windows.h>

unsigned int flags = FILE_NOTIFY_CHANGE_LAST_WRITE | 
                     FILE_NOTIFY_CHANGE_SIZE | 
                     FILE_NOTIFY_CHANGE_DIR_NAME | 
                     FILE_NOTIFY_CHANGE_FILE_NAME;

void execute(LPCTSTR program, LPTSTR paramaters)
{
    STARTUPINFO s;
    PROCESS_INFORMATION p;

    ZeroMemory(&s, sizeof(s));
    s.cb = sizeof(s);
    ZeroMemory(&p, sizeof(p));

    if (!CreateProcess(program, paramaters, NULL, NULL, true, 0, NULL, NULL, &s, &p))
    {
        printf("CreateProcess failed (%d)\n", GetLastError());
    }

    WaitForSingleObject(p.hProcess, INFINITE);

    CloseHandle(p.hProcess);
    CloseHandle(p.hThread);
}

int _tmain(int argc, _TCHAR* argv[])
{
    if (argc < 2) {
        printf("Please include the file path to monitor.");
        return 0;
    }

    LPCTSTR monitor = argv[1];
    bool watchSubTree = true;
	
    LPCTSTR program = _T("C:\\Program Files\\SyncToy 2.1\\SyncToyCmd.exe");
    LPTSTR paramters = _T(" -R");

    HANDLE hNotify = FindFirstChangeNotification(monitor, watchSubTree, flags);

    while (true)
    {
        if (WaitForSingleObject(hNotify, INFINITE) == WAIT_OBJECT_0)
        {
            printf("Change Detected.\n\n");
            execute(program, paramters);
            printf("Done\n\n");
            FindNextChangeNotification(hNotify);
        }
    }

    return 0;
}

Silent none console version.cpp

// Monitor a directory and call SyncToy if something changes.

#include <stdio.h>
#include <tchar.h>
#include <windows.h>

unsigned int flags = FILE_NOTIFY_CHANGE_LAST_WRITE | 
                     FILE_NOTIFY_CHANGE_SIZE | 
                     FILE_NOTIFY_CHANGE_DIR_NAME | 
                     FILE_NOTIFY_CHANGE_FILE_NAME;

void execute(LPCTSTR program, LPTSTR paramaters)
{
    STARTUPINFO s;
    PROCESS_INFORMATION p;
    
    ZeroMemory(&s, sizeof(s));
    s.cb = sizeof(s);
    ZeroMemory(&p, sizeof(p));
    
    //if (!CreateProcess(program, paramaters, NULL, NULL, true, 0, NULL, NULL, &s, &p))
    if (!CreateProcess(program, paramaters, NULL, NULL, true, CREATE_NO_WINDOW, NULL, NULL, &s, &p))
    {
        printf("CreateProcess failed (%d)\n", GetLastError());
    }

    WaitForSingleObject(p.hProcess, INFINITE);

    CloseHandle(p.hProcess);
    CloseHandle(p.hThread);
}

int CALLBACK WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)

//int _tmain(int argc, _TCHAR* argv[])
{
    if (strlen(lpCmdLine) < 1) {
        printf("Please include the file path to monitor.");
        return 0;
    }
    
    WCHAR pWideString[1000];
    MultiByteToWideChar(CP_ACP, 0, lpCmdLine, -1, pWideString, 1000);

    LPCTSTR monitor = pWideString;
    bool watchSubTree = true;
    
    LPCTSTR program = _T("C:\\Program Files\\SyncToy 2.1\\SyncToyCmd.exe");
    LPTSTR paramters = _T(" -R");

    HANDLE hNotify = FindFirstChangeNotification(monitor, watchSubTree, flags);
    
    while (true)
    {
        if (WaitForSingleObject(hNotify, INFINITE) == WAIT_OBJECT_0)
        {
            printf("Change Detected.\n\n");
            execute(program, paramters);
            printf("Done\n\n");
            FindNextChangeNotification(hNotify);
        }
    }

    return 0;
}