在C#中将int []转换为byte []类型的指针

问题描述：

我需要将int []转换为byte []指针.为了能够逐个像素地填充WriteableBitmap的条目，需要执行以下操作:

I require to convert int[] to byte[] pointer. The above is required in order to be able to populate the entries of a WriteableBitmap pixel by pixel as below:

//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++;
    }
}

如何获取类型为int []的wb1.Pixels的字节*指针?

How do I get a byte* pointer for wb1.Pixels which is of type int[]?

答

听起来像您要将数组中的每个 int 视为字节序列一样-

Sounds like you want to treat each int in your array as sequence of bytes - how about BitConverter.GetBytes?

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

如果要避免数组复制等操作，请使用允许使用指针的 unsafe (您需要在项目属性中选中允许不安全代码"复选框):

If you want to avoid array copying etc, use unsafe which allows pointers (you'd need to tick the "Allow unsafe code" checkbox in project properties):

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

在C#中将int []转换为byte []类型的指针

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