Wechselndes Hintergrundbild mit einem BATCH-Script realisieren?

// wallpaper.cpp

#define WINVER 0x0501
#define _WIN32_WINNT 0x0501

#include <stdio.h>
#include <tchar.h>
#include <windows.h>
#include <wininet.h>
#include <shlobj.h>
#include <errno.h>


void help()
{
  printf("Changes The Desktop Wallpaper.\n\nWALLPAPER Directory Style Wait\nWALLPAPER /?\n\n  Directory       Path And Folder Name The Wallpaper Files Are Placed.\n  Style           0 = Center; 1 = Tile; 2 = Stretch.\n  Wait            Seconds To Wait Before Next Changing.\n  /?              Displays This Help.\n\n  RETURN CODES:\n  3   Syntax Error\n  2   Folder Not Found\n  1   Process Failed\n\n");  
}


int changeWP(WCHAR *filename, DWORD dwstyle)
{
  IActiveDesktop *pActiveDesktop = NULL;
  ::CoInitialize(NULL);
  if (FAILED(CoCreateInstance(CLSID_ActiveDesktop, NULL, CLSCTX_INPROC_SERVER, IID_IActiveDesktop, (LPVOID*) &pActiveDesktop))) return 1;
  if (FAILED(pActiveDesktop->SetWallpaper(filename, 0))) return 1;
  WALLPAPEROPT wpo;
  wpo.dwSize = sizeof(wpo);
  wpo.dwStyle = dwstyle;
  if (FAILED(pActiveDesktop->SetWallpaperOptions(&wpo, NULL))) return 1;
  if (FAILED(pActiveDesktop->ApplyChanges(AD_APPLY_ALL))) return 1;
  pActiveDesktop->Release();
  ::CoUninitialize();
  return 0;
}


int _tmain(int argc, _TCHAR *argv)
{
  if (argc < 2) {help(); return 3;}
  if ((_tcscmp(argv[1], _T("/?")) == 0) && (argc == 2)) {help(); return 0;}  
  if (argc != 4) {help(); return 3;}

  _TCHAR *endptr = NULL;
  long lStyle = _tcstol(argv[2], &endptr, 10);
  if (errno == ERANGE) {help(); return 3;}
  if (_tcscmp(endptr, _T("\0")) != 0) {help(); return 3;}  
  if ((lStyle < 0) || (lStyle > 2)) {help(); return 3;}

  long lWait = _tcstol(argv[3], &endptr, 10);
  if (errno == ERANGE) {help(); return 3;}
  if (_tcscmp(endptr, _T("\0")) != 0) {help(); return 3;}  
  if (lWait < 0) {help(); return 3;}

  WCHAR path[1024];
  swprintf_s(path, 1024, L"\\\\?\\%s", argv[1]);  
  if (GetFileAttributesW(path) == INVALID_FILE_ATTRIBUTES) return 2;

  WCHAR dpath[1024], fpath[1024];
  HANDLE fHandle;
  WIN32_FIND_DATA wfd;
  swprintf_s(dpath, 1024, L"%s\\*", path);  

  while (1)
  {
    fHandle = FindFirstFileW(dpath, &wfd);
    do
    {
      if (!((wfd.cFileName=='.') && ((wfd.cFileName[1]=='.' && wfd.cFileName[2]==0) || wfd.cFileName[1]==0)))  
      {
        if (!(wfd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) && (CompareStringW(LOCALE_USER_DEFAULT, NORM_IGNORECASE, wfd.cFileName, -1, _T("desktop.ini"), -1) != 2) && (CompareStringW(LOCALE_USER_DEFAULT, NORM_IGNORECASE, wfd.cFileName, -1, _T("thumbs.db"), -1) != 2))  
        {
          swprintf_s(fpath, 1024, L"%s\\%s", argv[1], wfd.cFileName);  
          if (changeWP(fpath, (DWORD)lStyle)) return 1;
          Sleep((DWORD)lWait * 1000);
        }
      }
    }
    while (FindNextFileW(fHandle, &wfd));
    FindClose(fHandle);
  }
  return 0;
}

Changes The Desktop Wallpaper.

WALLPAPER Directory Style Wait
WALLPAPER /?

  Directory       Path And Folder Name The Wallpaper Files Are Placed.
  Style           0 = Center; 1 = Tile; 2 = Stretch.
  Wait            Seconds To Wait Before Next Changing.
  /?              Displays This Help.

  RETURN CODES:
  3   Syntax Error
  2   Folder Not Found
  1   Process Failed