how to change datatype of libpointer

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.

Answer 1

[Guillaume]

setdatatype(pointer, 'uint16Ptr', n);  %assuming the pointer points to an array of n uint16

should work.

[Kev Chen]

Thanks you .

I never thought that...

It works.

[vishal sp]

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);