我对使用沼泽地有问题。 Ptr ToStructure()从一个点子中提取数据,以建立DEVERODE。 http://msdn.microsoft.com/en-us/library/dd183528v=vs.85%29.aspx” rel=“noreferer”>Here 与DEVERODE结构的MSDN条目链接。

我的C#执行计划如下:

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
public struct DEVMODE
{
    public const int CCHDEVICENAME = 32;
    public const int CCHFORMNAME = 32;

    public unsafe fixed char dmDeviceName [CCHDEVICENAME];
    public Int16 dmSpecVersion;
    public Int16 dmDriverVersion;
    public Int16 dmSize;
    public Int16 dmDriverExtra;
    public DM_FIELD_TYPE dmFields;

    public Int16 dmOrientation;
    public Int16 dmPaperSize;
    public Int16 dmPaperLength;
    public Int16 dmPaperWidth;
    public Int16 dmScale;
    public Int16 dmCopies;
    public Int16 dmDefaultSource;
    public Int16 dmPrintQuality;

    public POINTL dmPosition;
    public Int32 dmDisplayOrientation;
    public Int32 dmDisplayFixedOutput;

    public short dmColor;
    public short dmDuplex;
    public short dmYResolution;
    public short dmTTOption;
    public short dmCollate;

    public unsafe fixed char dmFormName [CCHFORMNAME];
    public Int16 dmLogPixels;
    public Int32 dmBitsPerPel;
    public Int32 dmPelsWidth;
    public Int32 dmPelsHeight;
    public Int32 dmDisplayFlags;
    public Int32 dmNup;
    public Int32 dmDisplayFrequency;
    public Int32 dmICMMethod;
    public Int32 dmICMIntent;
    public Int32 dmMediaType;
    public Int32 dmDitherType;
    public Int32 dmReserved1;
    public Int32 dmReserved2;
    public Int32 dmPanningWidth;
    public Int32 dmPanningHeight;

    public DEVMODE(byte[] data)
    {
        unsafe
        {
            fixed (byte* packet = &data[0])
            {
                this = *(DEVMODE*)packet;
            }
        }
    }

}

[Flags()]
public enum DM_FIELD_TYPE : int
{
    /* field selection bits */
    DM_ORIENTATION          = 0x00000001,
    DM_PAPERSIZE            = 0x00000002,
    DM_PAPERLENGTH          = 0x00000004,
    DM_PAPERWIDTH           = 0x00000008,
    DM_SCALE                = 0x00000010,
    DM_POSITION             = 0x00000020,
    DM_NUP                  = 0x00000040,
    DM_DISPLAYORIENTATION   = 0x00000080,
    DM_COPIES               = 0x00000100,
    DM_DEFAULTSOURCE        = 0x00000200,
    DM_PRINTQUALITY         = 0x00000400,
    DM_COLOR                = 0x00000800,
    DM_DUPLEX               = 0x00001000,
    DM_YRESOLUTION          = 0x00002000,
    DM_TTOPTION             = 0x00004000,
    DM_COLLATE              = 0x00008000,
    DM_FORMNAME             = 0x00010000,
    DM_LOGPIXELS            = 0x00020000,
    DM_BITSPERPEL           = 0x00040000,
    DM_PELSWIDTH            = 0x00080000,
    DM_PELSHEIGHT           = 0x00100000,
    DM_DISPLAYFLAGS         = 0x00200000,
    DM_DISPLAYFREQUENCY     = 0x00400000,
    DM_ICMMETHOD            = 0x00800000,
    DM_ICMINTENT            = 0x01000000,
    DM_MEDIATYPE            = 0x02000000,
    DM_DITHERTYPE           = 0x04000000,
    DM_PANNINGWIDTH         = 0x08000000,
    DM_PANNINGHEIGHT        = 0x10000000,
    DM_DISPLAYFIXEDOUTPUT   = 0x20000000
}

public struct POINTL
{
    public Int32 x;
    public Int32 y;
}

在这种结构中,有2个特性阵列“dmDeviceName”和“dmFormName”。 两者都是32个长期性的。 问题在于,当我试图从某个点清除DEVERODE的结构时,这些特性阵列并没有得到适当的填补。 例如,dmDeviceName只具有实际装置名称的头等特性。 其余部分将只是。 正在穿透的Im法线如下:

DEVMODE devMode = (DEVMODE)Marshal.PtrToStructure(aData[i].NotifyData.Data.pBuf, typeof(DEVMODE));

“aData[i]。 通知Data.Data.pBuf”是DEVODE结构的一个有效点。 出于两个原因,我知道这一点。

1. 这一结构是一家名为FindNextPrinterChangeNoification(FindNextPrinterChangeNoification)的打印机驾驶员报送的一组信息。 我利用这一手段获取印刷工作信息,当我掌握印刷工作并利用上述法律来清除DEVERODE的标语时,“影印本”领域总是与该工作印刷的份数完全正确。 因此,在结构中的第12名成员似乎在结构中的某些成员似乎不在场时,如何正确打碎了脚。

2. I used Marshal.ReadByte() to forcibly read the first 100 bytes that aData[i].NotifyData.Data.pBuf was pointing to, and sure enough, the first collection of bytes were the full exact name of the printer device. So I know the information is there.

出于任何原因,当我使用沼泽地时。 Ptr ToStructure(PtrToStructure)似乎能够正确填写特征表。 我确信,大多数其他变量是正确的,但我怀疑,因为存在问题。 任何人都知道这里的情况。

--EDIT -- As requested, here is the code that populates the aData[] array:

private PRINTER_NOTIFY_INFO_DATA[] MarshalOutPrinterNotifyInfoDataArray(IntPtr ppPrinterNotifyInfo)
{
    //Dereferencing ppPrinterNotifyInfo and setting NotifyInfoStruct to it.
    PRINTER_NOTIFY_INFO NotifyInfoStruct = (PRINTER_NOTIFY_INFO)Marshal.PtrToStructure(ppPrinterNotifyInfo, typeof(PRINTER_NOTIFY_INFO));

    //Creating a point to point to the PRINTER_NOTIFY_INFO and then moving it to the end of the structure where the
    //aData[] member would begin.
    int paData = (int)ppPrinterNotifyInfo + Marshal.SizeOf(typeof(PRINTER_NOTIFY_INFO));

    //Creating an array to hold all the elements of our aData array.
    PRINTER_NOTIFY_INFO_DATA[] data = new PRINTER_NOTIFY_INFO_DATA[NotifyInfoStruct.Count];

    //looping through all the PRINTER_NOTIFY_INFO_DATA elments in the aData member and adding them to our local array.
    for (uint i = 0; i < NotifyInfoStruct.Count; i++)
    {
        //extracting out a single PRINTER_NOTIFY_INFO_DATA item and storing it in our local array
        data[i] = (PRINTER_NOTIFY_INFO_DATA)Marshal.PtrToStructure((IntPtr)paData, typeof(PRINTER_NOTIFY_INFO_DATA));

        //moving our pointer to the next PRINTER_NOTIFY_INFO_DATA item
        paData += Marshal.SizeOf(typeof(PRINTER_NOTIFY_INFO_DATA));
    }

    return data;
}



private void SomeRoutine()
{
    //////////////////
    /// some code here
    //////////////////

    //retrieving information about the most recent change notification for a change notification object associated with the printer
    FindNextPrinterChangeNotification(m_ManualResetEvent.SafeWaitHandle.DangerousGetHandle(), out pdwChangeFlags, null, out ppPrinterNotifyInfo);

    //Need to extract our PRINTER_NOTIFY_INFO_DATA array out of the PRINTER_NOTIFY_INFO structure
    PRINTER_NOTIFY_INFO_DATA[] aData = MarshalOutPrinterNotifyInfoDataArray(ppPrinterNotifyInfo);

    //////////////////
    /// some code here
    //////////////////
}