GDIplus Scale Bitmap

Question

Hello i'm trying to change scale GDIplus::Bitmap and save in memory scaled BItmap, and i have problem. I try many different sample, and my result is NULL. For Example I try change resolution for image, using SetResolution, also i try convert bitmap from image->graphic and use one of constructors GDIplus::Bitmap scale, but i haven't result. For example i try next code:

Bitmap *bitmap = new Bitmap((int32)width, (int32)height,PixelFormat32bppARGB);
bitmap=bmp.Clone(0,0,W,H,PixelFormat32bppPARGB);
mBitmap=(void *)bitmap->Clone(0.0f,0.0f,width,height,PixelFormat32bppPARGB);