WinAPI does not return any data | Rust Programming Language Community | Page 1

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If the function fails, the return value is zero and GetLastError returns the error code.

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the slice you give it has size 0

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it preallocates the capacity

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but the size is still 0

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the capacity says how many elements you can add to the vector without another allocation

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the size says how many elements are actually in the vector

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vec![0; 128]

#WinAPI does not return any data