本文整理匯總了C#中System.IntPtr.Zero字段的典型用法代碼示例。如果您正苦於以下問題：C# IntPtr.Zero字段的具體用法？C# IntPtr.Zero怎麽用？C# IntPtr.Zero使用的例子？那麽, 這裏精選的字段代碼示例或許可以為您提供幫助。您也可以進一步了解該字段所在類System.IntPtr的用法示例。
在下文中一共展示了IntPtr.Zero字段的2個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的C#代碼示例。
示例1: CreateFile
//引入命名空間
using Microsoft.Win32.SafeHandles;
using System;
using System.Runtime.InteropServices;
public class Example
{
private const uint GENERIC_READ = 0x80000000;
private const uint OPEN_EXISTING = 3;
private const uint FILE_ATTRIBUTE_NORMAL = 128;
private const uint FILE_FLAG_OVERLAPPED = 0x40000000;
[DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
private static extern Microsoft.Win32.SafeHandles.SafeFileHandle CreateFile(
string lpFileName, System.UInt32 dwDesiredAccess, System.UInt32 dwShareMode,
IntPtr pSecurityAttributes, System.UInt32 dwCreationDisposition,
System.UInt32 dwFlagsAndAttributes, IntPtr hTemplateFile);
public static void Main()
{
SafeFileHandle hnd = CreateFile("CallOfTheWild.txt", GENERIC_READ, 0,
IntPtr.Zero, OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED,
IntPtr.Zero);
if (hnd.IsInvalid) {
Exception ex = Marshal.GetExceptionForHR(Marshal.GetHRForLastWin32Error());
Console.WriteLine("Attempt to open file failed:");
Console.WriteLine(" {0}", ex.Message);
return;
}
else {
Console.WriteLine("File successfully opened.");
hnd.Close();
}
}
}輸出：
Attempt to open file failed: The system cannot find the file specified. (Exception from HRESULT: 0x80070002)
示例2: GetWindow
//引入命名空間
using System;
using System.Runtime.InteropServices;
public class Example
{
private const int GW_OWNER = 4;
[DllImport("user32", CharSet=CharSet.Auto, SetLastError=true, ExactSpelling=true)]
public static extern IntPtr GetWindow(IntPtr hwnd, int wFlag);
public static void Main()
{
IntPtr hwnd = new IntPtr(3);
IntPtr hOwner = GetWindow(hwnd, GW_OWNER);
if (hOwner == IntPtr.Zero)
Console.WriteLine("Window not found.");
}
}輸出：
Window not found.