BoxSyncFolderRedirector.cpp

#include "shlobj.h"
#include "ShObjIdl.h"
#include "Shlwapi.h"

int main(int, char **) {
  // Initialize COM
  CoInitialize(0);

  // Get path to user's home directory
  WCHAR path[MAX_PATH];
  SHGetFolderPathW(NULL, CSIDL_PROFILE, NULL, 0, path);

  // Contruct path to Box Sync folder
  WCHAR boxSyncPath[MAX_PATH];
  PathCombine(boxSyncPath, path, L"Box Sync");

  // Contruct path to Box Sync\Documents folder
  WCHAR boxSyncDocumentsPath[MAX_PATH];
  PathCombine(boxSyncDocumentsPath, boxSyncPath, L"Documents");

  // Set up a notification for when a change occurs in user's home directory
  HANDLE change =
      FindFirstChangeNotification(path, FALSE, FILE_NOTIFY_CHANGE_DIR_NAME);

  while (true) {
    // Wait for a change
    WaitForSingleObject(change, INFINITE);

    // Check if the Box Sync directory appeared
    DWORD attributes = GetFileAttributes(boxSyncPath);
    if (attributes != INVALID_FILE_ATTRIBUTES &&
        (attributes & FILE_ATTRIBUTE_DIRECTORY)) {

      // Create the KnownFolderManager object
      IKnownFolderManager *folderManager = 0;
      CoCreateInstance(CLSID_KnownFolderManager, NULL, CLSCTX_ALL,
                       IID_IKnownFolderManager, (void **)&folderManager);

      // Perform the redirection
      LPWSTR error;
      folderManager->Redirect(FOLDERID_Documents, NULL,
                              KF_REDIRECT_COPY_CONTENTS |
                                  KF_REDIRECT_DEL_SOURCE_CONTENTS |
                                  KF_REDIRECT_UNPIN | KF_REDIRECT_PIN,
                              boxSyncDocumentsPath, 0, NULL, &error);
      return 0;
    } else {
      // Continue monitoring
      FindNextChangeNotification(change);
    }
  }
}