排列桌面圖標

 // The Desktop ListView window is the grandchild of the ProgMan window.
   HWND hwndLV = GetFirstChild(GetFirstChild(
      FindWindow(TEXT("ProgMan"), NULL)));


int nMaxItems = ListView_GetItemCount(hwndLV);


   // When saving new positions, delete the old position 
   // information that is currently in the registry.
   LONG l = RegDeleteKey(HKEY_CURRENT_USER, g_szRegSubKey);


   // Create the registry key to hold the info
   HKEY hkey;
   l = RegCreateKeyEx(HKEY_CURRENT_USER, g_szRegSubKey, 0, NULL, 
      REG_OPTION_NON_VOLATILE, KEY_SET_VALUE, NULL, &hkey, NULL);
   chASSERT(l == ERROR_SUCCESS);


   for (int nItem = 0; nItem < nMaxItems; nItem++) {


      // Get the name and position of a ListView item.
      TCHAR szName[MAX_PATH];
      ListView_GetItemText(hwndLV, nItem, 0, szName, chDIMOF(szName));


      POINT pt;
      ListView_GetItemPosition(hwndLV, nItem, &pt);


      // Save the name and position in the registry.
      l = RegSetValueEx(hkey, szName, 0, REG_BINARY, (PBYTE) &pt, sizeof(pt));
      chASSERT(l == ERROR_SUCCESS);
   }
   RegCloseKey(hkey);

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

 HKEY hkey;

   LONG l = RegOpenKeyEx(HKEY_CURRENT_USER, g_szRegSubKey,
      0, KEY_QUERY_VALUE, &hkey);
   if (l == ERROR_SUCCESS) {


      // If the ListView has AutoArrange on, temporarily turn it off.
      DWORD dwStyle = GetWindowStyle(hwndLV);
      if (dwStyle & LVS_AUTOARRANGE) 
         SetWindowLong(hwndLV, GWL_STYLE, dwStyle & ~LVS_AUTOARRANGE);


      l = NO_ERROR;
      for (int nIndex = 0; l != ERROR_NO_MORE_ITEMS; nIndex++) {
         TCHAR szName[MAX_PATH];
         DWORD cbValueName = chDIMOF(szName);


         POINT pt;
         DWORD cbData = sizeof(pt), nItem;


         // Read a value name and position from the registry.
         DWORD dwType;
         l = RegEnumValue(hkey, nIndex, szName, &cbValueName, 
            NULL, &dwType, (PBYTE) &pt, &cbData);


         if (l == ERROR_NO_MORE_ITEMS) 
            continue;


         if ((dwType == REG_BINARY) && (cbData == sizeof(pt))) {
            // The value is something that we recognize; try to find
            // an item in the ListView control that matches the name.
            LV_FINDINFO lvfi;
            lvfi.flags = LVFI_STRING; 
            lvfi.psz = szName; 
            nItem = ListView_FindItem(hwndLV, -1, &lvfi);
            if (nItem != -1) {
               // We found a match; change the item's position.
               ListView_SetItemPosition(hwndLV, nItem, pt.x, pt.y);
            }
         }
      }
      // Turn AutoArrange back on if it was originally on.
      SetWindowLong(hwndLV, GWL_STYLE, dwStyle);
      RegCloseKey(hkey);
   }