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Jsctypes/api: Difference between revisions
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→Examples: copyediting
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This allocates a new C++ object of type <code>int32_t</code> (4 bytes of memory), zeroes it out, and returns a JS object that manages the allocated memory. Whenever the JS object is garbage-collected, the allocated memory will be automatically freed. | This allocates a new C++ object of type <code>int32_t</code> (4 bytes of memory), zeroes it out, and returns a JS object that manages the allocated memory. Whenever the JS object is garbage-collected, the allocated memory will be automatically freed. | ||
Of course you don't normally need to do this, as js-ctypes will autoconvert JS numbers to various C/C++ types for you: | |||
let myfunc = mylib.declare("myfunc", ctypes.default_abi, | let myfunc = mylib.declare("myfunc", ctypes.default_abi, | ||
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<code>ctypes.int32_t</code> is a <code>CType</code>. Like all other CTypes, it can be used for type specification when passed as an object, as above. (This will work for user-defined <code>CTypes</code> such as structs and pointers also - see later.) | <code>ctypes.int32_t</code> is a <code>CType</code>. Like all other CTypes, it can be used for type specification when passed as an object, as above. (This will work for user-defined <code>CTypes</code> such as structs and pointers also - see later.) | ||
The object created by <code>new ctypes.int32_t</code> is called a <code>CData</code> object, and they are described in detail in the "<code>CData</code> objects" section above. | |||
Opaque pointers: | Opaque pointers: | ||