Databases
StackOverflow2013
Postsdbo
POSet ListView sort arrow AccessViolationException error
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POSet ListView sort arrow AccessViolationException error
    primarykey
    data
    text
    <p>I wrote a class MyListView in order to add an method to set sort arrow:</p> <pre><code>using System; using System.Runtime.InteropServices; using System.Windows.Forms; namespace WindowsDataTypes { class MyListView : ListView { public const Int32 HDF_SORTDOWN = 0x0200; public const Int32 HDF_SORTUP = 0x0400; public const UInt32 HDI_FORMAT = 0x0004; public const UInt32 HDM_GETITEM = 0x120b; public const UInt32 HDM_SETITEM = 0x120c; public const UInt32 LVM_GETHEADER = 0x101f; [DllImport("user32.dll", CharSet = CharSet.Auto)] public static extern IntPtr SendMessage(IntPtr hWnd, UInt32 uMsg, UIntPtr wParam, IntPtr lParam); [DllImport("uxtheme.dll", CharSet = CharSet.Unicode)] public static extern Int32 SetWindowTheme(IntPtr hWnd, String pszSubAppName, String pszSubIdList); struct HDITEM { public UInt32 mask; public Int32 cxy; public String pszText; public IntPtr hbm; public Int32 cchTextMax; public Int32 fmt; public IntPtr lParam; public Int32 iImage; public Int32 iOrder; public UInt32 type; public IntPtr pvFilter; public UInt32 state; } public MyListView() { this.DoubleBuffered = true; } protected override void OnHandleCreated(EventArgs e) { base.OnHandleCreated(e); SetWindowTheme(this.Handle, "Explorer", null); } public void SetSortArrow(int column, SortOrder sortOrder) { IntPtr hHeader = SendMessage(this.Handle, LVM_GETHEADER, UIntPtr.Zero, IntPtr.Zero); HDITEM headerItem = new HDITEM(); headerItem.mask = HDI_FORMAT; IntPtr pHeaderItem = Marshal.AllocHGlobal(Marshal.SizeOf(headerItem)); Marshal.StructureToPtr(headerItem, pHeaderItem, true); SendMessage(hHeader, HDM_GETITEM, new UIntPtr((UInt32)column), pHeaderItem); headerItem.fmt = ((HDITEM)Marshal.PtrToStructure(pHeaderItem, headerItem.GetType())).fmt; switch (sortOrder) { case SortOrder.Ascending: headerItem.fmt &amp;= ~HDF_SORTDOWN; headerItem.fmt |= HDF_SORTUP; break; case SortOrder.Descending: headerItem.fmt &amp;= ~HDF_SORTUP; headerItem.fmt |= HDF_SORTDOWN; break; case SortOrder.None: headerItem.fmt &amp;= ~(HDF_SORTDOWN | HDF_SORTUP); break; } Marshal.StructureToPtr(headerItem, pHeaderItem, true); SendMessage(hHeader, HDM_SETITEM, new UIntPtr((UInt32)column), pHeaderItem); Marshal.FreeHGlobal(pHeaderItem); } } } </code></pre> <p>Sometimes error happens even if I didn't modify the source code and just run the second time when I call <code>SetSortArrow</code>.</p> <p>What's wrong with my code?</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USEFanZh
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COWhat error do you get ?
      singulars
      1. POSet ListView sort arrow AccessViolationException error
      1. USAlex
    2. CO@Alex AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
      singulars
      1. POSet ListView sort arrow AccessViolationException error
      1. USEFanZh
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload