I am try use GDI+
I am need write my image to tmp file.
How I can use 'GdipSaveImageToStream' function to write image to file?

1) I am need create tmp file
2) I am need to write there image

I use

invoke GdipSaveImageToStream,[gdip_bitmap],?????,encoder_clsid,NULL

what I am need to insert instead of ?????. A handle of opened file?

P.S. function 'GdipSaveImageToFile' not suit for me, because it need file as constant.

AFAICT, it just promises not to change the string passed. Calculated pathname might work well. Unless you want to write the image data only as part of the temporary file (among other stuff), retrieving an IStream pointer from somewhere looks like an unnecessary overhead.