swift - 将 UnsafeMutablePointer 类型转换为 UnsafeMutablePointer<#Struct type#>

Question

我在 Swift 中创建了一个名为 RGB 的结构，非常简单:

struct PixelRGB {
    var r: CUnsignedChar = 0
    var g: CUnsignedChar = 0
    var b: CUnsignedChar = 0

    init(red: CUnsignedChar, green: CUnsignedChar, blue: CUnsignedChar) {
        r = red
        g = green
        b = blue
    }
}

我有一个指针 var imageData: UnsafeMutablePointer<PixelRGB>! .

我想为这个指针分配一些空间，但是malloc返回 UnsafeMutablePointer<Void>我不能像下面这样转换它:

imageData = malloc(UInt(dataLength)) as UnsafeMutablePointer<PixelRGB> // 'Void' is not identical to `PixelRGB`

无论如何要解决这个问题？感谢您的帮助!

Answer 1

我想你想说的大概是这样的:

imageData = UnsafeMutablePointer<PixelRGB>.alloc(dataLength)