GetSystemInfo总是从Win Service上的Win7上的dwAllocationGranularity返回0

Question

我正在尝试使用来自Windows 7上的C＃3.5 Windows服务应用程序的GetSystemInfo（）获取分配粒度大小。但是，当从调用返回时，SYSTEM_INFO结构在dwAllocationGranularity中始终为0（其他字段已填充数据）如预期的那样）

为简洁起见，SYSTEM_INFO结构看起来像这样，省略了PROCESSOR_ARCHITECTURE和PROCESSOR_TYPE枚举：

public struct SYSTEM_INFO
{
    public PROCESSOR_ARCHITECTURE wProcessorArchitecture;
    public ushort wReserved;
    public uint dwPageSize;
    public int lpMinimumApplicationAddress;
    public int lpMaximumApplicationAddress;
    public uint dwActiveProcessorMask;
    public uint dwNumberOfProcessors;
    public PROCESSOR_TYPE dwProcessorType;
    public uint dwAllocationGranularity;
    public ushort wProcessorLevel;
    public ushort wProcessorRevision;
}

对GetSystemInfo的extern调用是这样的：

[DllImport("kernel32")]
public static extern void GetSystemInfo(ref SYSTEM_INFO SystemInfo); 

调用代码如下：

SYSTEM_INFO sysInfo = new SYSTEM_INFO();
GetSystemInfo(ref sysInfo);

运行代码后的输出SYS_INFO结构是：

dwActiveProcessorMask        4294901759
dwAllocationGranularity      0
dwNumberOfProcessors         2047
dwPageSize                   4096
dwProcessorType              15
lpMaximumApplicationAddress  0
lpMinimumApplicationAddress  65536
wProcessorArchitecture       9
wProcessorLevel              4
wProcessorRevision           0
wReserved                    0

任何想法我缺少什么或建议其他方式来获取此信息（我不想硬编码到64Kb JIC它在某些时候被更改）？感谢。

Answer 1

您也没有2047处理器:)声明错误，它将在64位模式下失败。 lpMin / MaxApplicationAddress和dwActiveProcessorMask是IntPtr。