“RegEnumKeyEx"返回一个空字符串数组(c#调用)
本文关键字:一个 数组 调用 字符串 RegEnumKeyEx quot 返回 | 更新日期: 2023-09-27 17:53:34
我必须在注册表分支中获得子键列表和值列表。
[DllImport("advapi32.dll", EntryPoint="RegEnumKeyExW",
CallingConvention=CallingConvention.Winapi)]
[MethodImpl(MethodImplOptions.PreserveSig)]
extern private static int RegEnumKeyEx(IntPtr hkey, uint index,
char[] lpName, ref uint lpcbName,
IntPtr reserved, IntPtr lpClass, IntPtr lpcbClass,
out long lpftLastWriteTime);
// Get the names of all subkeys underneath this registry key.
public String[] GetSubKeyNames()
{
lock(this)
{
if(hKey != IntPtr.Zero)
{
// Get the number of subkey names under the key.
uint numSubKeys, numValues;
RegQueryInfoKey(hKey, null,IntPtr.Zero, IntPtr.Zero,out numSubKeys, IntPtr.Zero, IntPtr.Zero, out numValues,IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero);
// Create an array to hold the names.
String[] names = new String [numSubKeys];
StringBuilder sb = new StringBuilder();
uint MAX_REG_KEY_SIZE = 1024;
uint index = 0;
long writeTime;
while (index < numSubKeys)
{
sb = new StringBuilder();
if (RegEnumKeyEx(hKey,index,sb,ref MAX_REG_KEY_SIZE, IntPtr.Zero,IntPtr.Zero,IntPtr.Zero,out writeTime) != 0)
{
break;
}
names[(int)(index++)] = sb.ToString();
}
// Return the final name array to the caller.
return names;
}
return new String [0];
}
}
现在可以正常工作了,但只适用于第一个元素。对于0索引返回keyname,但对于其他索引返回"。
怎么可能呢?
顺便说一句:我用你的定义代替了我的定义,工作得很好
RegEnumKeyEx的p/Invoke定义是什么?
也许,试试这个:
[DllImport("advapi32.dll", EntryPoint = "RegEnumKeyEx")]
extern private static int RegEnumKeyEx(UIntPtr hkey,
uint index,
StringBuilder lpName,
ref uint lpcbName,
IntPtr reserved,
IntPtr lpClass,
IntPtr lpcbClass,
out long lpftLastWriteTime);
来自pinvoke.net站点,它接受stringbuilder而不是字符数组。这将排除未显示的代码(如ArrayToString
和P/Invoke定义)中的潜在错误,这些代码也未显示。
为什么要使用p/Invoke呢?您可以使用Registry
类来代替…
using (RegistryKey key = Registry.LocalMachine.OpenSubKey("SomeKey"))
{
string[] subKeys = key.GetSubKeyNames();
string[] valueNames = key.GetValueNames();
string myValue = (string)key.GetValue("myValue");
}