Marshal::ReadInt64 Method (IntPtr)
Reads a 64-bit signed integer from unmanaged memory.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- ptr
-
Type:
System::IntPtr
The address in unmanaged memory from which to read.
| Exception | Condition |
|---|---|
| AccessViolationException | ptr is not a recognized format. -or- ptr is null. -or- ptr is invalid. |
ReadInt64 has an implied offset of 0. This method enables direct interaction with an unmanaged C-style Int64 array, eliminating the expense of copying an entire unmanaged array (using Marshal::Copy) to a separate managed array before reading its element values.
Reading from unaligned memory locations is supported.
The following example demonstrates how to read and write to an unmanaged array using the ReadInt64 and WriteInt64 methods.
The following example demonstrates how to use the ReadInt64 method to read the value of an unmanaged __int64 variable.
using namespace System; using namespace System::Runtime::InteropServices; void main() { // Create an unmanaged __int64. __int64 myVal = 42; // Read the value as a managed Int64. Int64 ^ myManagedVal = Marshal::ReadInt64((IntPtr) &myVal); // Display the value to the console. Console::WriteLine(myManagedVal); }
requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1