how to change datatype of libpointer

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Kev Chen
Kev Chen 2016-3-1
评论： vishal sp 2022-5-6
Hi , I am trying to use Matlab and shared library.
If I have a C function which is like below
void * foo(int n);
It's just like that we get a void type pointer containing n int data , returned from foo .
In C , we can change void type to int or double easily.
But how to change type in Matlab ?
I tried
pointer = calllib(lib,'foo',1000);
pointer.datatype = 'uint16Ptr'; %Changing the 'DataType' property of lib.pointer is not allowed.

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Guillaume
Guillaume 2016-3-1
编辑：Guillaume 2016-3-1
setdatatype(pointer, 'uint16Ptr', n); %assuming the pointer points to an array of n uint16
should work.
  2 个评论
Kev Chen
Kev Chen 2016-3-2
Thanks you .
I never thought that...
It works.
vishal sp
vishal sp 2022-5-6
iam getting error for this, Check for missing argument or incorrect argument data type in call to
function 'setdatatype'.
Error in getLineColour (line 14)
setdatatype(image,'uint8Ptr',3);

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