GetThumbnailImage

获得缩略图;

Image *GetThumbnailImage(

UINT thumbWidth, //宽度(像素)

UINT thumbHeight, //高度(像素)

GetThumbnailImageAbort callback,

VOID *callbackData);

callback 可选。您提供的回调函数。在创建或检索的缩略图图像处理，微软Windows GDI +中调用该函数，让您有机会中止这一进程。默认值是NULL。

callbackData 可选。指针指向的内存块，它包含要由回调函数使用的数据。默认值是NULL

MSDN 例子

VOID Example_GetThumbnail(HDC hdc)

{

Graphics graphics(hdc);

// Create an image and a thumbnail of the image.

Image image(L"Crayons.jpg");

Image* pThumbnail = image.GetThumbnailImage(40, 40, NULL, NULL);

// Draw the original and the thumbnail images.

graphics.DrawImage(&image, 10, 10, image.GetWidth(), image.GetHeight());

graphics.DrawImage(

pThumbnail,

150,

10,

pThumbnail->GetWidth(),

pThumbnail->GetHeight());

delete pThumbnail;

}