wallpaper option

i'm trying to change the option to tile the desktop wallpaper. i'm using this code:

#include <Shlobj.h>
...
WALLPAPEROPT WPO;
...
WPO.dwStyle = WPSTYLE_TILE;
IActiveDesktop::SetWallpaperOptions(&WPO,0);

but i keep getting these errors:

error C2065: 'WALLPAPEROPT' : undeclared identifier
error C2146: syntax error : missing ';' before identifier 'WPO'
error C2065: 'WPO' : undeclared identifier
error C2224: left of '.dwStyle' must have struct/union type
error C2065: 'WPSTYLE_TILE' : undeclared identifier
error C2143: syntax error : missing ';' before ':'


to my knowledge WALLPAPEROPT is declared in Shlobj.h. all help is appreciated.

use
#include <WININET.H>
#include <Shlobj.h>

almost worked. now i only get this error:

error C2143: syntax error : missing ';' before ':'


from here:

IActiveDesktop::SetWallpaperOptions(&WPO,0);

Quote:

---

IActiveDesktop::SetWallpaperOptions(&WPO,0);

---

IActiveDesktop is not a namespace, it's an interface name. Try searching MSDN for 'IActiveDesktop'.

If you want to use this, you need to get a pointer to the shell's IActiveDesktop:

PHP Code:

---

HRESULT hr;
IActiveDesktop *pActiveDesktop;

//Create an instance of the Active Desktop
hr = CoCreateInstance(CLSID_ActiveDesktop, NULL, CLSCTX_INPROC_SERVER,
            IID_IActiveDesktop, (void**)&pActiveDesktop); 


---

Now you can use the methods of IActiveDesktop:

PHP Code:

---

pActiveDesktop->SetWallpaperOptions(&WPO,0); 


---

Be sure to release the object when you're done with it:

PHP Code:

---

pActiveDesktop->Release(); 


---

You may need a later version of the Platform SDK to do this.

I confess I would still used the registry option, particularly since the shell functions make this so easy...

not only that but you forgot to do the all usefull and all annoying "ZeroMemory" :).

SPH