将 Int 复制到 UnsafeMutablePointer

Question

我有一个 Int，我想将其复制到 UnsafeMutablePointer<Int32>?

类型的指针

我试图将它转换为Data然后复制它，但是复制函数参数是UnsafeMutablePointer<UInt8>

类型

这是我试过的：

var sizePointer: UnsafeMutablePointer<Int32>?
var numOfBytes = 100
var sizeData = Data(bytes: &(numOfBytes), count: MemoryLayout<Int>.size)
//What's now? How to copy it to the pointer?
//sizeData.copyBytes(to: size, count: MemoryLayout<Int>.size) not working

编辑：

我有以下函数，它获取一个指针。我需要将 int 复制到该地址。

func f(pointer: UnsafeMutablePointer<Int32>?) {
    var numOfBytes = 100
    //copy numOfBytes  to the pointer's address
}

Answer 1

如果您只是想调用一个需要 UnsafeMutablePointer<Int32> 类型参数的函数，那么它就这么简单：

func f(_ i: UnsafeMutablePointer<Int32>) {
    print(i.pointee)
}

var x = Int32()
f(&x)

将 Int 复制到 UnsafeMutablePointer

Copy Int to UnsafeMutablePointer

swift

unsafe-pointers