Use of the Marshal.Copy () method in C #

use of the Marshal.Copy method in C #

The Marshal.Copy () method is used to replicate content between managed objects (arrays) and unmanaged objects (INTPTR)

The function has many overloads, as follows:

Copy (array<byte>[] () [], Int32, INTPTR, Int32) copies data from a one-dimensional, managed 8-bit unsigned integer array to an unmanaged memory pointer.

Copy (array<char>[] () [], Int32, INTPTR, Int32) copies data from a one-dimensional, managed character array to an unmanaged memory pointer.

Copy (array<double>[] () [], Int32, INTPTR, Int32) copies data from a one-dimensional, managed double-precision floating-point array to an unmanaged memory pointer.

Copy (array<int16>[] () [], Int32, INTPTR, Int32) copies data from a one-dimensional, managed 16-bit signed integer array to an unmanaged memory pointer.

Copy (array<int32>[] () [], Int32, INTPTR, Int32) copies data from a one-dimensional, managed 32-bit signed integer array to an unmanaged memory pointer.

Copy (array<int64>[] () [], Int32, INTPTR, Int32) copies data from a one-dimensional, managed 64-bit signed integer array to an unmanaged memory pointer.

Copy (INTPTR, array<byte>[] () [], Int32, Int32) copies data from an unmanaged memory pointer to an array of managed 8-bit unsigned integers.

Copy (INTPTR, array<char>[] () [], Int32, Int32) copies data from an unmanaged memory pointer to a managed character array.

Copy (INTPTR, array<double>[] () [], Int32, Int32) copies data from an unmanaged memory pointer to a managed double-precision floating-point array.

Copy (INTPTR, array<int16>[] () [], Int32, Int32) copies data from an unmanaged memory pointer to a managed 16-bit signed integer array.

Copy (INTPTR, array<int32>[] () [], Int32, Int32) copies data from an unmanaged memory pointer to a managed 32-bit signed integer array.

Copy (INTPTR, array<int64>[] () [], Int32, Int32) copies data from an unmanaged memory pointer to a managed 64-bit signed integer array.

Copy (INTPTR, array<intptr>[] () [], Int32, Int32) copies data from an unmanaged memory pointer to a managed INTPTR array.

Copy (INTPTR, array<single>[] () [], Int32, Int32) copies data from an unmanaged memory pointer to a managed single-precision floating-point array.

Copy (array<intptr>[] () [], Int32, INTPTR, Int32) copies data from a one-dimensional managed IntPtr array to an unmanaged memory pointer.

Copy (array<single>[] () [], Int32, INTPTR, Int32) copies data from a one-dimensional, managed single-precision floating-point array to an unmanaged memory pointer.

It is important to note that the use of the two parameter Int32 type

Thetwo parameters of the I nt32 type are used to qualify the array, one of which is a qualified starting position, a limited length

"Xuwei";

• IntPtr pName = Marshal.allochglobal (2*name. Length);
• Marshal.Copy (name. ToCharArray (), 0, PName, name. Length);
• char[] CName = new char[name.  Length];
• Marshal.Copy (PName, cName, 0, name. Length);

Easy to know name. Length=5

(1) Assigning 2*name to the pname pointer . Length bytes of space

NOTE: The parameter CB inMarshal.allochglobal (Int32 CB) is the number of bytes allocated

(2) Copy the contents of the name conversion char[] to the memory referred to by pname, and the length is the number of char, that is, name. Length

(3) assigning name.length char locations to a CNAME

(4) Copy the contents of the pname into the CNAME array with the same length as name. Length

Use of the Marshal.Copy () method in C #