ThumbnailProviderHandlerBaseGetThumbnail Method

public int GetThumbnail(
	uint cx,
	out IntPtr phbmp,
	out WTS_ALPHATYPE pdwAlpha
)

Public Function GetThumbnail ( 
	cx As UInteger,
	<OutAttribute> ByRef phbmp As IntPtr,
	<OutAttribute> ByRef pdwAlpha As WTS_ALPHATYPE
) As Integer

public:
virtual int GetThumbnail(
	unsigned int cx, 
	[OutAttribute] IntPtr% phbmp, 
	[OutAttribute] WTS_ALPHATYPE% pdwAlpha
) sealed

abstract GetThumbnail : 
        cx : uint32 * 
        phbmp : IntPtr byref * 
        pdwAlpha : WTS_ALPHATYPE byref -> int 
override GetThumbnail : 
        cx : uint32 * 
        phbmp : IntPtr byref * 
        pdwAlpha : WTS_ALPHATYPE byref -> int 

Parameters

cx

Type: SystemUInt32
The maximum thumbnail size, in pixels. The Shell draws the returned bitmap at this size or smaller. The returned bitmap should fit into a square of width and height cx, though it does not need to be a square image. The Shell scales the bitmap to render at lower sizes. For example, if the image has a 6:4 aspect ratio, then the returned bitmap should also have a 6:4 aspect ratio.

phbmp

Type: SystemIntPtr
When this method returns, contains a pointer to the thumbnail image handle. The image must be a DIB section and 32 bits per pixel. The Shell scales down the bitmap if its width or height is larger than the size specified by cx. The Shell always respects the aspect ratio and never scales a bitmap larger than its original size.

pdwAlpha

Type: WTS_ALPHATYPE
When this method returns, contains a pointer to one of the values from the WTS_ALPHATYPE enumeration.

Return Value

Implements

Reference