c# - C#中int[]转换为byte[]类型指针

Question

我需要将 int[] 转换为 byte[] 指针。为了能够逐像素填充 WriteableBitmap 的条目，需要执行上述操作，如下所示:

//previewBuffer1 is of type byte[]
WriteableBitmap wb1 = new WriteableBitmap(nVidWidth, nVidHeight);
int k=0;
// wb1.Pixels is of type int[] by default
byte* data = (byte*) wb1.Pixels;  // ****THIS DOESN'T WORK. THROWS ERROR. HOW CAN I ACCOMPLISH THIS***
for (int i=0; i<nVidHeight; i++){
    for (int j=0; j<nVidWidth; j++){
        byte grayscaleval = previewBuffer1[k];
        data [4*k] = grayscaleval ;
        data [4*k + 1] = grayscaleval ;
        data [4*k + 2] = grayscaleval ;
        k++;
    }
}

如何获取 wb1.Pixels 类型为 int[] 的 byte* 指针？

Answer 1

听起来您想将数组中的每个 int 视为字节序列 - BitConverter.GetBytes 怎么样？ ？

byte[] bytes = BitConverter.GetBytes(intValue);

---

如果您想避免数组复制等，请使用允许指针的unsafe(您需要在项目属性中勾选“允许不安全代码”复选框):

unsafe static void UnsafeConvert(int value)
{
    byte* bytes = (byte*)&value;
    byte first = bytes[0];
    ...
}