Converting void* to D array

[Daniel Kozak via Digitalmars-d-learn]

On Wednesday, 15 April 2015 at 04:43:39 UTC, Daniel Kozák wrote:
>
> On Wed, 15 Apr 2015 04:24:20 +0000
> Craig Dillabaugh via Digitalmars-d-learn
> <digitalmars-d-learn at puremagic.com> wrote:
>
>> Hi.
>> I want to call a C library function that returns a data buffer 
>> as a void*.  How do I convert the resulting void* into 
>> something I can process in D?
>> 
>> //I have the following function from the GDAL C library.
>> extern(C) CPLErr GDALReadBlock( GDALRasterBandH, int, int, 
>> void* );
>> 
>> 
>> So I have (GByte is defined in the GDAL library):
>> 
>> void* buffer = malloc( GByte.sizeof * x_block_size * 
>> y_block_size );
>> 
>> I fill the buffer (and ignore any errors :o)
>> 
>> GDALReadBlock( AGDALRasterBandHInstance, xblock, yblock, 
>> buffer );
>> 
>> 
>> Now, how can I access the data in buffer?
> Or you probably can do it like this:
>
> auto buffer = new GByte[xblock*yblock];
>
> GDALReadBlock( AGDALRasterBandHInstance, xblock, yblock,
> (cast void*)buffer.ptr );
But in this case memory will be scan by GC. Which probably is not 
something what you want.