我想通过 c#/PInvoke 调用 GetLogicalProcessorInformation
功能,但我坚持 SYSTEM_LOGICAL_PROCESSOR_INFORMATION
结构和 CACHE_DESCRIPTOR
结构。
我应该如何定义这些结构以便正确使用?
主要问题:
1. SYSTEM_LOGICAL_PROCESSOR_INFORMATION
在其定义中有联合
2. SYSTEM_LOGICAL_PROCESSOR_INFORMATION
有 ULONGLONG
在它的定义中
3. CACHE_DESCRIPTOR
的定义中有WORD
和DWORD
。
你能帮我解决这些结构吗?
最佳答案
更新:修复了必须手动完成的结构编码。
这是一个非常困惑的 P/invoke。即使您定义了结构和联合,调用该函数也并非易事,因为您必须手动编码结构。
[StructLayout(LayoutKind.Sequential)]
public struct PROCESSORCORE
{
public byte Flags;
};
[StructLayout(LayoutKind.Sequential)]
public struct NUMANODE
{
public uint NodeNumber;
}
public enum PROCESSOR_CACHE_TYPE
{
CacheUnified,
CacheInstruction,
CacheData,
CacheTrace
}
[StructLayout(LayoutKind.Sequential)]
public struct CACHE_DESCRIPTOR
{
public byte Level;
public byte Associativity;
public ushort LineSize;
public uint Size;
public PROCESSOR_CACHE_TYPE Type;
}
[StructLayout(LayoutKind.Explicit)]
public struct SYSTEM_LOGICAL_PROCESSOR_INFORMATION_UNION
{
[FieldOffset(0)]
public PROCESSORCORE ProcessorCore;
[FieldOffset(0)]
public NUMANODE NumaNode;
[FieldOffset(0)]
public CACHE_DESCRIPTOR Cache;
[FieldOffset(0)]
private UInt64 Reserved1;
[FieldOffset(8)]
private UInt64 Reserved2;
}
public enum LOGICAL_PROCESSOR_RELATIONSHIP
{
RelationProcessorCore,
RelationNumaNode,
RelationCache,
RelationProcessorPackage,
RelationGroup,
RelationAll = 0xffff
}
public struct SYSTEM_LOGICAL_PROCESSOR_INFORMATION
{
public UIntPtr ProcessorMask;
public LOGICAL_PROCESSOR_RELATIONSHIP Relationship;
public SYSTEM_LOGICAL_PROCESSOR_INFORMATION_UNION ProcessorInformation;
}
[DllImport(@"kernel32.dll", SetLastError=true)]
public static extern bool GetLogicalProcessorInformation(
IntPtr Buffer,
ref uint ReturnLength
);
private const int ERROR_INSUFFICIENT_BUFFER = 122;
public static SYSTEM_LOGICAL_PROCESSOR_INFORMATION[] MyGetLogicalProcessorInformation()
{
uint ReturnLength = 0;
GetLogicalProcessorInformation(IntPtr.Zero, ref ReturnLength);
if (Marshal.GetLastWin32Error() == ERROR_INSUFFICIENT_BUFFER)
{
IntPtr Ptr = Marshal.AllocHGlobal((int)ReturnLength);
try
{
if (GetLogicalProcessorInformation(Ptr, ref ReturnLength))
{
int size = Marshal.SizeOf(typeof(SYSTEM_LOGICAL_PROCESSOR_INFORMATION));
int len = (int)ReturnLength / size;
SYSTEM_LOGICAL_PROCESSOR_INFORMATION[] Buffer = new SYSTEM_LOGICAL_PROCESSOR_INFORMATION[len];
IntPtr Item = Ptr;
for (int i = 0; i < len; i++)
{
Buffer[i] = (SYSTEM_LOGICAL_PROCESSOR_INFORMATION)Marshal.PtrToStructure(Item, typeof(SYSTEM_LOGICAL_PROCESSOR_INFORMATION));
Item += size;
}
return Buffer;
}
}
finally
{
Marshal.FreeHGlobal(Ptr);
}
}
return null;
}
static void Main(string[] args)
{
SYSTEM_LOGICAL_PROCESSOR_INFORMATION[] Buffer = MyGetLogicalProcessorInformation();
for (int i=0; i<Buffer.Length; i++)
{
Console.WriteLine(Buffer[i].ProcessorMask);
}
}
关于c# - GetLogicalProcessorInformation 函数的 PInvoke,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/6972437/