How to draw image directly from PC local disk?

I have used those code trying to draw images from local disk without importing to Editor, but failed,
UTexture2D pTestTexture = Cast(StaticLoadObject(UTexture2D::StaticClass(), NULL, L"F:\test.bmp"));
I am going to develop PC image Viewer by using UE4(Can view images form local disk),
How to do it?
Please help me, Thanks!