为什么这个结构的变量在被调用时没有被填满？

Question

我有以下代码，当我运行它时，将1000字节传递给函数中的参数，结构MEMORY_BASIC_INFORMATION没有使用任何变量，它们都保持为0.我想知道这是否应该是？

public unsafe static bool CheckForSufficientStack(long bytes) 
{ 
    MEMORY_BASIC_INFORMATION stackInfo = new MEMORY_BASIC_INFORMATION(); 

    IntPtr currentAddr = new IntPtr((uint)&stackInfo - 4096); 

    VirtualQuery(currentAddr, ref stackInfo, sizeof(MEMORY_BASIC_INFORMATION)); 

    return ((uint)currentAddr.ToInt64() - stackInfo.AllocationBase) > (bytes + STACK_RESERVED_SPACE); 
} 

private const long STACK_RESERVED_SPACE = 4096 * 16; 

[DllImport("kernel32.dll")] 
private static extern int VirtualQuery(
    IntPtr lpAddress, 
    ref MEMORY_BASIC_INFORMATION lpBuffer, 
    int dwLength); 

    private struct MEMORY_BASIC_INFORMATION 
    { 
    internal uint BaseAddress; 
    internal uint AllocationBase; 
    internal uint AllocationProtect; 
    internal uint RegionSize; 
    internal uint State; 
    internal uint Protect; 
    internal uint Type; 
    } 

我在Core Duo 2.0Ghz上运行Vista Enterprise X64。

Answer 1

那么，使用uint来谈论X64上的地址可能是一个问题。为什么-4096？

我刚才想：

IntPtr currentAddr = new IntPtr(&stackInfo); 

Answer 2

是的，这个代码不能在64位操作系统上运行。演员阵容不对，MEMORY_BASIC_INFORMATION声明也是错误的。这应该是更接近，未经检验的，因为我现在无法接近到x64机器：

public unsafe static bool CheckForSufficientStack(long bytes) { 
     var stackInfo = new MEMORY_BASIC_INFORMATION(); 
     IntPtr currentAddr = new IntPtr((long)&stackInfo - 4096); 
     VirtualQuery(currentAddr, ref stackInfo, sizeof(MEMORY_BASIC_INFORMATION)); 
     return (currentAddr.ToInt64() - (long)stackInfo.AllocationBase) > (bytes + STACK_RESERVED_SPACE); 
    } 

    private struct MEMORY_BASIC_INFORMATION { 
     internal IntPtr BaseAddress; 
     internal IntPtr AllocationBase; 
     internal uint AllocationProtect; 
     internal IntPtr RegionSize; 
     internal uint State; 
     internal uint Protect; 
     internal uint Type; 
    }