[Gdal-dev] how to write out a tiff file using GDAL?

[cudars]

I am quite new to GDAL.
I want to read a big remote sensing image (tiff file format),do the digital
image process, then write the result to a tiff file. The program language is
C++.

I have finished read in the digital image file and digital image processing.

As the image file has several bands. I do not know how to write out a tiff
file.

Should I use create or createcopy?  The gdalenhance source code using
VRTDataset. In my case, should I use VRTDataset ?  I did not understand the
gdalenhance source code so far.

Could anyone give me a example to illustrate how to write out a tiff file in
GDAL?

Thanks in advanced.

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