PInvoke for Windows CE上的GlobalMemoryStatusEx
问题描述:
如果您不熟悉或了解Windows CE和Compact Framework,请不要投票。谢谢。PInvoke for Windows CE上的GlobalMemoryStatusEx
有人知道这个函数是否可用在WinCE上(如果有的话)DLL是什么?我试图从“coredll.dll”和“kernel.dll”PInvoke这个。 Win32版本来自“kernel32.dll”。
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("kernel.dll")] // and "coredll.dll" also doesn't work
public static extern bool GlobalMemoryStatusEx([In,Out] MEMORYSTATUSEX lpBuffer);
上面的函数失败,当我尝试使用它与异常“无法找到PInvoke DLL'kernel.dll'”。
PS:我用的PInvoked功能负载,如这一个:
[DllImport("coredll.dll")]
public static extern IntPtr SendMessage(IntPtr hWnd, int nMsg, IntPtr wParam, IntPtr lParam);
答
这里只有GlobalMemoryStatus调用,不延长(...例)版本。它位于coredll.dll中,参见http://pinvoke.net/default.aspx/coredll.GlobalMemoryStatus
答
已经实现了C.Evenhuis建议的答案,它运行良好。以下是任何可能需要此代码的人的代码:
// Structure to allow getting memory usage
public struct MEMORYSTATUS
{
public int nLength;
public int nMemoryLoad;
public uint uTotalPhys;
public uint uAvailPhys;
public uint uTotalPageFile;
public uint uAvailPageFile;
public uint uTotalVirtual;
public uint uAvailVirtual;
}
[DllImport("coredll", EntryPoint="GlobalMemoryStatus", SetLastError = false)]
public static extern void GlobalMemoryStatus(out MEMORYSTATUS memCE);
MEMORYSTATUS mem = new MEMORYSTATUS();
mem.nLength = Marshal.SizeOf(typeof(MEMORYSTATUS));
GlobalMemoryStatus(out mem);
// Label1.Text = (mem.uAvailPhys.ToString() + "Bytes");
答
我以这种方式使用。
/// <summary>
/// https://msdn.microsoft.com/en-us/library/ee488368.aspx
/// This structure contains information about current memory availability. The GlobalMemoryStatus function uses this structure.
/// </summary>
[StructLayout(LayoutKind.Sequential)]
public struct MemoryStatus
{
/// <summary>
/// Specifies the size, in bytes, of the MEMORYSTATUS structure.
/// Set this member to sizeof(MEMORYSTATUS) when passing it to the GlobalMemoryStatus function.
/// </summary>
public int Length;
/// <summary>
/// Specifies a number between zero and 100 that gives a general idea of current memory use, in which zero indicates no memory use and 100 indicates full memory use.
/// </summary>
public uint MemoryLoad;
/// <summary>
/// Indicates the total number of bytes of physical memory.
/// </summary>
public uint TotalPhys;
/// <summary>
/// Indicates the number of bytes of physical memory available.
/// </summary>
public uint AvailPhys;
/// <summary>
/// Indicates the total number of bytes that can be stored in the paging file.
/// This number does not represent the physical size of the paging file on disk.
/// </summary>
public uint TotalPageFile;
/// <summary>
/// Indicates the number of bytes available in the paging file.
/// </summary>
public uint AvailPageFile;
/// <summary>
/// Indicates the total number of bytes that can be described in the user mode portion of the virtual address space of the calling process.
/// </summary>
public uint TotalVirtual;
/// <summary>
/// Indicates the number of bytes of unreserved and uncommitted memory in the user mode portion of the virtual address space of the calling process.
/// </summary>
public uint AvailVirtual;
[DllImport("coredll.dll")]
private static extern void GlobalMemoryStatus(ref MemoryStatus ms);
public static string GetMemoryStatus()
{
var retValue = new StringBuilder();
MemoryStatus ms = GlobalMemoryStatus();
retValue.AppendLine(string.Format("Memory Load {0} %", ms.MemoryLoad));
retValue.AppendLine(string.Format("Total Phys {0} Kb", ms.TotalPhys/1024));
retValue.AppendLine(string.Format("Avail Phys {0} Kb", ms.AvailPhys/1024));
retValue.AppendLine(string.Format("Tota PFile {0} bytes", ms.TotalPageFile));
retValue.AppendLine(string.Format("Avai PFile {0} bytes", ms.AvailPageFile));
retValue.AppendLine(string.Format("Total Virt {0} Kb", ms.TotalVirtual/1024));
retValue.AppendLine(string.Format("Avail Virt {0} Kb", ms.AvailVirtual/1024));
return retValue.ToString();
}
public static MemoryStatus GlobalMemoryStatus()
{
MemoryStatus ms = new MemoryStatus();
ms.Length = Marshal.SizeOf(ms);
GlobalMemoryStatus(ref ms);
return ms;
}
public static uint GetMemoryLoad()
{
var ms = GlobalMemoryStatus();
return ms.MemoryLoad;
}
}
你可以在你的Windows CE SDK
typedef struct _MEMORYSTATUS {
DWORD dwLength;
DWORD dwMemoryLoad;
DWORD dwTotalPhys;
DWORD dwAvailPhys;
DWORD dwTotalPageFile;
DWORD dwAvailPageFile;
DWORD dwTotalVirtual;
DWORD dwAvailVirtual;
} MEMORYSTATUS, *LPMEMORYSTATUS;
VOID
WINAPI
GlobalMemoryStatus(
__inout LPMEMORYSTATUS lpBuffer
);
因为WINBASE.H检查是_inout在SDK。我已经使用“ref”参数修饰符。
这是所有关于。
谢谢,刚刚实施,它运作良好。 – AlainD