This examples lets you find the background definition for the current folder.
PSZ pszImageFile;
ULONG ulImageMode;
ULONG ulScaleFactor;
ULONG ulBackgroundType;
LONG lBackgroundColor;
_wpQueryFldrBackground(somSelf,
&pszImageFileName,
&ulImageMode,
&ulScaleFactor,
&ulBackgroundType,
&lBackgroundColor);
/* pszImageFileName contains the pointer to the name of the image file
* ulImageMode is BACKGROUND_NORMAL_IMAGE,
* BACKGROUND_TILED_IMAGE,
* or BACKGROUND_SCALED_IMAGE
* ulScaleFactor is a number between 1 and 20
* ulBackgroundType is BACKGROUND_COLOR_ONLY or BACKGROUND_IMAGE
* lBackgroundColor is an encoded RGB color value
*/