c#调用API（kernel32）获取内存信息。

sinat_15262463 2014-07-02 12:25:46



 /// <summary>

    /// 收集内存情况

    /// </summary>

    [StructLayout(LayoutKind.Sequential)]

    public struct MEMORYSTATUS

    {

        public uint dwLength;

        public uint dwMemoryLoad;

        public ulong ullTotalPhys;

        public ulong ullAvailPhys;

        public ulong ullTotalPageFile;

        public ulong ullAvailPageFile;

        public ulong ullTotalVirtual;

        public ulong ullAvailVirtual;

        public ulong ullAvailExtendedVirtual; 

    }

这是定义的结构体。

获取信息的时候，



MEMORYSTATUS memStatus = new MEMORYSTATUS();



GlobalMemoryStatus(ref   memStatus);//给此结构赋值

获取系统总内存的时候，用的 memStatus.ullTotalPhys 获取。

但是获取的是一个很大的值,除了6次1024，才得到16(电脑16GB内存)。

这是哪里错了？？？

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宝_爸 2014-07-02

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On computers with more than 4 GB of memory, the GlobalMemoryStatus function can return incorrect information, reporting a value of –1 to indicate an overflow. For this reason, applications should use the GlobalMemoryStatusEx function instead. 来自msdn: http://msdn.microsoft.com/en-us/library/windows/desktop/aa366586(v=vs.85).aspx

tiannailu 2014-07-02

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Byte->KB->MB->GB 应该是四次吧？

sinat_15262463 2014-07-02

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引用 7 楼 findcaiyzh 的回复:


       [StructLayout(LayoutKind.Sequential, CharSet=CharSet.Auto)]
        private class MEMORYSTATUSEX
        {
                  public uint dwLength;
            public uint dwMemoryLoad;
                  public ulong ullTotalPhys;
                  public ulong ullAvailPhys;
                  public ulong ullTotalPageFile;
                  public ulong ullAvailPageFile;
                  public ulong ullTotalVirtual;
                  public ulong ullAvailVirtual;
                  public ulong ullAvailExtendedVirtual;
                  public MEMORYSTATUSEX()
            {
                      this.dwLength = (uint) Marshal.SizeOf(typeof( MEMORYSTATUSEX ));
            }
        }


         [return: MarshalAs(UnmanagedType.Bool)]
         [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
         static extern bool GlobalMemoryStatusEx( [In, Out] MEMORYSTATUSEX lpBuffer);

参考: http://www.pinvoke.net/default.aspx/kernel32/GlobalMemoryStatusEx.html

OK 多谢!

tiannailu 2014-07-02

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引用 7 楼 findcaiyzh 的回复:


       [StructLayout(LayoutKind.Sequential, CharSet=CharSet.Auto)]
        private class MEMORYSTATUSEX
        {
                  public uint dwLength;
            public uint dwMemoryLoad;
                  public ulong ullTotalPhys;
                  public ulong ullAvailPhys;
                  public ulong ullTotalPageFile;
                  public ulong ullAvailPageFile;
                  public ulong ullTotalVirtual;
                  public ulong ullAvailVirtual;
                  public ulong ullAvailExtendedVirtual;
                  public MEMORYSTATUSEX()
            {
                      this.dwLength = (uint) Marshal.SizeOf(typeof( MEMORYSTATUSEX ));
            }
        }


         [return: MarshalAs(UnmanagedType.Bool)]
         [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
         static extern bool GlobalMemoryStatusEx( [In, Out] MEMORYSTATUSEX lpBuffer);

参考: http://www.pinvoke.net/default.aspx/kernel32/GlobalMemoryStatusEx.html

宝_爸 2014-07-02

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       [StructLayout(LayoutKind.Sequential, CharSet=CharSet.Auto)]
        private class MEMORYSTATUSEX
        {
                  public uint dwLength;
            public uint dwMemoryLoad;
                  public ulong ullTotalPhys;
                  public ulong ullAvailPhys;
                  public ulong ullTotalPageFile;
                  public ulong ullAvailPageFile;
                  public ulong ullTotalVirtual;
                  public ulong ullAvailVirtual;
                  public ulong ullAvailExtendedVirtual;
                  public MEMORYSTATUSEX()
            {
                      this.dwLength = (uint) Marshal.SizeOf(typeof( MEMORYSTATUSEX ));
            }
        }


         [return: MarshalAs(UnmanagedType.Bool)]
         [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
         static extern bool GlobalMemoryStatusEx( [In, Out] MEMORYSTATUSEX lpBuffer);

参考: http://www.pinvoke.net/default.aspx/kernel32/GlobalMemoryStatusEx.html

宝_爸 2014-07-02

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GlobalMemoryStatus如何定义的？

sinat_15262463 2014-07-02

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引用 2 楼 findcaiyzh 的回复:

On computers with more than 4 GB of memory, the GlobalMemoryStatus function can return incorrect information, reporting a value of –1 to indicate an overflow. For this reason, applications should use the GlobalMemoryStatusEx function instead. 来自msdn: http://msdn.microsoft.com/en-us/library/windows/desktop/aa366586(v=vs.85).aspx

新手，不是太懂。多指点几句呗....

sinat_15262463 2014-07-02

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引用 2 楼 findcaiyzh 的回复:

On computers with more than 4 GB of memory, the GlobalMemoryStatus function can return incorrect information, reporting a value of –1 to indicate an overflow. For this reason, applications should use the GlobalMemoryStatusEx function instead. 来自msdn: http://msdn.microsoft.com/en-us/library/windows/desktop/aa366586(v=vs.85).aspx

注意到这个问题了。你看下我定义的结构体，已经是用到GlobalMemoryStatusEx了

sinat_15262463 2014-07-02