.NET：如何 PInvoke UpdateProcThreadAttribute

发布于 2024-08-05 15:16:00 字数 915 浏览 0 评论 0原文

我尝试在 Windows 7 上使用 PInvoke UpdateProcThreadAttribute()，但我的尝试只是不断返回 FALSE，最后一个 Win32 错误为 50。

Function declaration (from MSDN)

BOOL WINAPI UpdateProcThreadAttribute(
  __inout    LPPROC_THREAD_ATTRIBUTE_LIST lpAttributeList,
  __in       DWORD dwFlags,
  __in       DWORD_PTR Attribute,
  __in       PVOID lpValue,
  __in       SIZE_T cbSize,
  __out_opt  PVOID lpPreviousValue,
  __in_opt   PSIZE_T lpReturnSize
);

这是我对 PInvoke 签名的尝试：

[DllImport("kernel32.dll", CallingConvention = CallingConvention.Winapi, SetLastError = true)]
public static extern bool UpdateProcThreadAttribute
(
            IntPtr lpAttributeList,
            UInt32 dwFlags,
            ref UInt32 Attribute,
            ref IntPtr lpValue,
            ref IntPtr cbSize,
            IntPtr lpPreviousValue,
            IntPtr lpReturnSize
);

此声明是否合理？谢谢。

原文

I am trying to PInvoke UpdateProcThreadAttribute() on Windows 7 but my attempts just keep returning FALSE with a Last Win32 Error of 50.

Function declaration (from MSDN)

BOOL WINAPI UpdateProcThreadAttribute(
  __inout    LPPROC_THREAD_ATTRIBUTE_LIST lpAttributeList,
  __in       DWORD dwFlags,
  __in       DWORD_PTR Attribute,
  __in       PVOID lpValue,
  __in       SIZE_T cbSize,
  __out_opt  PVOID lpPreviousValue,
  __in_opt   PSIZE_T lpReturnSize
);

Here is my attempt at the PInvoke signature:

[DllImport("kernel32.dll", CallingConvention = CallingConvention.Winapi, SetLastError = true)]
public static extern bool UpdateProcThreadAttribute
(
            IntPtr lpAttributeList,
            UInt32 dwFlags,
            ref UInt32 Attribute,
            ref IntPtr lpValue,
            ref IntPtr cbSize,
            IntPtr lpPreviousValue,
            IntPtr lpReturnSize
);

Is this declaration sensible? Thanks.

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七秒鱼° 2024-08-12 15:16:00

您的声明存在一些问题，但给您带来不支持错误的问题是 Attribute 参数。 DWORD_PTR 不是指针，而是指针大小的无符号整数，因此它应该是 IntPtr，而不是 ref uint。

我将使用的声明是：

    [DllImport("kernel32.dll", SetLastError = true)]
    [return: MarshalAs(UnmanagedType.Bool)]
    private static extern bool UpdateProcThreadAttribute(
        IntPtr lpAttributeList, uint dwFlags, IntPtr Attribute,
        IntPtr lpValue, IntPtr cbSize, IntPtr lpPreviousValue, 
        IntPtr lpReturnSize);

编辑：

我尝试将其作为注释来执行，但不需要很好地编码。

对于进程句柄，您需要一个 IntPtr 来保存句柄。所以你需要类似的东西：

IntPtr hProcess //previously retrieved.
IntPtr lpAttributeList //previously allocated using InitializeProcThreadAttributeList and Marshal.AllocHGlobal.

const int PROC_THREAD_ATTRIBUTE_PARENT_PROCESS = 0x00020000;
IntPtr lpValue = Marshal.AllocHGlobal(IntPtr.Size); 
Marshal.WriteIntPtr(lpValue, hProcess);
if(UpdateProcThreadAttribute(lpAttributeList, 0, (IntPtr)PROC_THREAD_ATTRIBUTE_PARENT_PROCESS, lpValue, (IntPtr)IntPtr.Size, IntPtr.Zero, IntPtr.Zero))
{
    //do something
}

//Free lpValue only after the lpAttributeList is deleted.

You have a few problems with your declaration but the one that is giving you the not supported error is the Attribute parameter. A DWORD_PTR is not a pointer but rather a pointer sized unsigned integer so rather than ref uint it should be an IntPtr.

The declaration I would use is:

    [DllImport("kernel32.dll", SetLastError = true)]
    [return: MarshalAs(UnmanagedType.Bool)]
    private static extern bool UpdateProcThreadAttribute(
        IntPtr lpAttributeList, uint dwFlags, IntPtr Attribute,
        IntPtr lpValue, IntPtr cbSize, IntPtr lpPreviousValue, 
        IntPtr lpReturnSize);

EDIT:

I tried to do this as a comment but it doesn't take to code very well.

For a process handle you need an IntPtr to hold the handle. So you would need something like:

IntPtr hProcess //previously retrieved.
IntPtr lpAttributeList //previously allocated using InitializeProcThreadAttributeList and Marshal.AllocHGlobal.

const int PROC_THREAD_ATTRIBUTE_PARENT_PROCESS = 0x00020000;
IntPtr lpValue = Marshal.AllocHGlobal(IntPtr.Size); 
Marshal.WriteIntPtr(lpValue, hProcess);
if(UpdateProcThreadAttribute(lpAttributeList, 0, (IntPtr)PROC_THREAD_ATTRIBUTE_PARENT_PROCESS, lpValue, (IntPtr)IntPtr.Size, IntPtr.Zero, IntPtr.Zero))
{
    //do something
}

//Free lpValue only after the lpAttributeList is deleted.

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