public static void SetHasChildren(TreeNode node, bool hasChildren)
{
TVITEM item = new TVITEM();
item.mask = TreeViewItemFlags.CHILDREN;
item.hItem = node.Handle;
item.cChildren = hasChildren ? 1 : 0;
SendMessage(node.TreeView.Handle, TVM_SETITEMA, 0, ref item);
}
/// <summary>
/// Hides the checkbox for the specified node on a TreeView control.
/// </summary>
public static void HideCheckBox(this TreeNode node)
{
TVITEM tvi = new TVITEM();
tvi.hItem = node.Handle;
tvi.mask = TVIF_STATE;
tvi.stateMask = TVIS_STATEIMAGEMASK;
tvi.state = 0;
SendMessage(node.TreeView.Handle, TVM_SETITEM, IntPtr.Zero, ref tvi);
}
private void HideCheckBox(TreeNode node)
{
TVITEM tvi = new TVITEM();
tvi.hItem = node.Handle;
tvi.mask = TVIF_STATE;
tvi.stateMask = TVIS_STATEIMAGEMASK;
tvi.state = 0;
IntPtr lparam = Marshal.AllocHGlobal(Marshal.SizeOf(tvi));
Marshal.StructureToPtr(tvi, lparam, false);
SendMessage(this.file_list.Handle, TVM_SETITEM, IntPtr.Zero, lparam);
}
string GetItemText(IntPtr hTreeItem)
{
string text;
TVITEM tvi = new TVITEM();
tvi.hItem = hTreeItem;
tvi.mask = (int)TreeViewItemFlags.TVIF_TEXT;
tvi.cchTextMax = 80;
tvi.pszText = Marshal.AllocHGlobal(80);
WindowsAPI.SendMessage(Handle, (int)TreeViewMessages.TVM_GETITEMW, 0, ref tvi);
text = Marshal.PtrToStringAuto(tvi.pszText);
return(text);
}
public static IntPtr TreeView_SetItemState(HandleRef hwndTV, IntPtr hti, uint data, uint _mask)
{
TVITEM _ms_TVi = new TVITEM();
_ms_TVi.mask = (uint)TVIF.TVIF_STATE;
_ms_TVi.hItem = (hti);
_ms_TVi.stateMask = (_mask);
_ms_TVi.state = (data);
IntPtr p = Marshal.AllocCoTaskMem(Marshal.SizeOf(_ms_TVi));
Marshal.StructureToPtr(_ms_TVi, p, false);
IntPtr r = SendMessage(hwndTV, (int)TVM.TVM_SETITEMW, IntPtr.Zero, p);
Marshal.FreeCoTaskMem(p);
return r;
}
public static uint GetTreeViewOverlay(TreeNode node)
{
var tvi = new TVITEM
{
mask = Win32.TVIF_STATE,
hItem = node.Handle,
stateMask = Win32.TVIS_OVERLAYMASK,
state = 0
};
var ret = Win32.SendMessage(node.TreeView.Handle, Win32.TVM_GETITEMW, 0, ref tvi);
return(tvi.state >> 8);
}
public static bool GetTreeViewText(IntPtr AHandle, List <string> AOutput)
{
if (AOutput == null)
{
return(false);
}
uint vProcessId;
GetWindowThreadProcessId(AHandle, out vProcessId);
IntPtr vProcess = OpenProcess(PROCESS_VM_OPERATION | PROCESS_VM_READ |
PROCESS_VM_WRITE, false, vProcessId);
IntPtr vPointer = VirtualAllocEx(vProcess, IntPtr.Zero, 4096,
MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
try
{
uint vItemCount = TreeView_GetCount(AHandle);
IntPtr vTreeItem = TreeView_GetRoot(AHandle);
Console.WriteLine(vItemCount);
for (int i = 0; i < vItemCount; i++)
{
byte[] vBuffer = new byte[256];
TVITEM[] vItem = new TVITEM[1];
vItem[0] = new TVITEM();
vItem[0].mask = TVIF_TEXT;
vItem[0].hItem = vTreeItem;
vItem[0].pszText = (IntPtr)((int)vPointer + Marshal.SizeOf(typeof(TVITEM)));
vItem[0].cchTextMax = vBuffer.Length;
uint vNumberOfBytesRead = 0;
WriteProcessMemory(vProcess, vPointer,
Marshal.UnsafeAddrOfPinnedArrayElement(vItem, 0),
Marshal.SizeOf(typeof(TVITEM)), ref vNumberOfBytesRead);
SendMessage(AHandle, TVM_GETITEMA, 0, (int)vPointer);
ReadProcessMemory(vProcess,
(IntPtr)((int)vPointer + Marshal.SizeOf(typeof(TVITEM))),
Marshal.UnsafeAddrOfPinnedArrayElement(vBuffer, 0),
vBuffer.Length, ref vNumberOfBytesRead);
Console.WriteLine(Marshal.PtrToStringAnsi(
Marshal.UnsafeAddrOfPinnedArrayElement(vBuffer, 0)));
vTreeItem = TreeNodeGetNext(AHandle, vTreeItem);
}
}
finally
{
VirtualFreeEx(vProcess, vPointer, 0, MEM_RELEASE);
CloseHandle(vProcess);
}
return(true);
}
private static void UncheckNode(IntPtr handle, int hItem)
{
if (hItem > 0)
{
TVITEM tvi = new TVITEM();
tvi.mask = (uint)CommCtrl.TVIF_HANDLE | (uint)CommCtrl.TVIF_STATE;
tvi.hItem = new IntPtr(hItem);
tvi.stateMask = (uint)CommCtrl.TVIS_STATEIMAGEMASK;
tvi.state = 0;
User32.SendMessage(handle, CommCtrl.TVM_SETITEM, IntPtr.Zero, ref tvi);
}
}
public static void SetTreeViewOverlay(TreeNode node, uint overlayIndex)
{
// TreeView_SetItemState(node.TreeView.Handle, node.Handle,
// overlayIndex << 8, TVIS_OVERLAYMASK); 相当の処理
var tvi = new TVITEM
{
mask = Win32.TVIF_STATE,
hItem = node.Handle,
stateMask = Win32.TVIS_OVERLAYMASK,
state = (overlayIndex << 8)
};
Win32.SendMessage(node.TreeView.Handle, Win32.TVM_SETITEMW, 0, ref tvi);
}
private void HideCheckBox(TreeView tvw, TreeNode node)
{
TVITEM tvi = new TVITEM();
tvi.hItem = node.Handle;
tvi.mask = TVIF_STATE;
tvi.stateMask = TVIS_STATEIMAGEMASK;
tvi.state = 0;
SendMessage(tvw.Handle, TVM_SETITEM, IntPtr.Zero, ref tvi);
}
public void SetNodeCheckState(TreeNode node, NodeCheckState checkState)
{
if (node.TreeView != this)
{
return;
}
TVITEM item = new TVITEM();
item.mask = TreeViewItemFlags.STATE | TreeViewItemFlags.HANDLE;
item.stateMask = 0xF000;
item.state = (int)checkState << 12;
item.hItem = node.Handle;
Win32Declarations.SendMessage(Handle, TreeViewMessage.TVM_SETITEMA, 0, ref item);
}
protected void SetNodeSelectedState(TreeNode node, bool selected)
{
if (node.TreeView != this)
{
return;
}
TVITEM item = new TVITEM();
item.mask = TreeViewItemFlags.STATE | TreeViewItemFlags.HANDLE;
item.stateMask = (int)TreeViewItemState.SELECTED;
item.state = selected ? item.stateMask : 0;
item.hItem = node.Handle;
Win32Declarations.SendMessage(Handle, TreeViewMessage.TVM_SETITEMA, 0, ref item);
}
public static IntPtr TreeView_SetItemState(HandleRef hwndTV, IntPtr hti, uint data, uint _mask)
{
TVITEM _ms_TVi = new TVITEM();
_ms_TVi.mask = (uint)TVIF.TVIF_STATE;
_ms_TVi.hItem = (hti);
_ms_TVi.stateMask = (_mask);
_ms_TVi.state = (data);
IntPtr p = Marshal.AllocCoTaskMem(Marshal.SizeOf(_ms_TVi));
Marshal.StructureToPtr(_ms_TVi, p, false);
IntPtr r = SendMessage(hwndTV, (int)TVM.TVM_SETITEMW, IntPtr.Zero, p);
Marshal.FreeCoTaskMem(p);
return(r);
}
public void SetTreeNodeState(TriStateTreeNode node, CheckBoxState state)
{
if (node == null)
{
return;
}
TVITEM tvItem = new TVITEM();
tvItem.mask = TVIF_HANDLE | TVIF_STATE;
tvItem.hItem = node.Handle;
tvItem.stateMask = TVIS_STATEIMAGEMASK;
//State image index in bits 12..15
tvItem.state = ((int)state) << 12;
SendMessage(this.Handle, TVM_SETITEM, 0, ref tvItem);
}
// Hide TreeView CheckBox Code
// --------------------------------------------------------------------------
#region Hide TreeView CheckBox Code
static public void ShowCheckBox(TreeNode treeNode, bool show = true)
{
if (treeNode.TreeView == null)
{
return;
}
else
{
TVITEM tvi = new TVITEM();
tvi.hItem = treeNode.Handle;
tvi.mask = TVIF_STATE;
tvi.stateMask = TVIS_STATEIMAGEMASK;
tvi.state = 0;
IntPtr lparam = Marshal.AllocHGlobal(Marshal.SizeOf(tvi));
Marshal.StructureToPtr(tvi, lparam, false);
SendMessage(treeNode.TreeView.Handle, TVM_SETITEM, IntPtr.Zero, lparam);
}
}
public string GetItemText(IntPtr handle)
{
TVITEM tvi = new TVITEM();
const int maxSize = 260;
IntPtr pszText = LocalAlloc(0x40, maxSize);
tvi.mask = TVIF_TEXT;
tvi.hItem = handle;
tvi.cchTextMax = 260;
tvi.pszText = pszText;
SendMessageTVI(Handle, TVM_GETITEM, IntPtr.Zero, ref tvi);
string nodeText = Marshal.PtrToStringAnsi(tvi.pszText, maxSize);
LocalFree(pszText);
return(nodeText?.TrimEnd('\0'));
}
private void HideCheckBox(TreeNode node)
{
TVITEM tvi = new TVITEM
{
hItem = node.Handle,
mask = TVIF_STATE,
stateMask = TVIS_STATEIMAGEMASK,
state = 0,
lpszText = null,
cchTextMax = 0,
iImage = 0,
iSelectedImage = 0,
cChildren = 0,
lParam = IntPtr.Zero
};
IntPtr lparam = Marshal.AllocHGlobal(Marshal.SizeOf(tvi));
Marshal.StructureToPtr(tvi, lparam, false);
SendMessage(node.TreeView.Handle, TVM_SETITEM, IntPtr.Zero, lparam);
}
private void RemoveCheckboxOnNode(TreeNode node)
{
TVITEM tvItem = new TVITEM();
tvItem.hItem = node.Handle;
tvItem.mask = TVIF_STATE;
tvItem.stateMask = TVIS_STATEIMAGEMASK;
tvItem.state = 0;
IntPtr lparam = Marshal.AllocHGlobal(Marshal.SizeOf(tvItem));
try
{
Marshal.StructureToPtr(tvItem, lparam, false);
SendMessage(_groupsTreeView.Handle, TVM_SETITEM, IntPtr.Zero, lparam);
}
finally
{
Marshal.FreeHGlobal(lparam);
}
}
/// <summary>
/// Associates an overlay image with a tree node. The overlay image is taken from the normal
/// image list of the tree view the node is contained in. Also the overlay image must have been
/// made available by <see cref="SetOverlayImage(ImageList,int,int)"/>.
/// </summary>
/// <param name="node">node to associate the overlay with</param>
/// <param name="overlayIndex">index between 1 and 5 indicating the overlay image to use or 0 to indicate no image</param>
public static void SetOverlayIndex(TreeNode node, int overlayIndex)
{
if (overlayIndex < 0 || overlayIndex > 5)
throw new ArgumentOutOfRangeException("overlayIndex", overlayIndex, "overlay image must be between 0 and 5");
TVITEM tvi = new TVITEM();
// Define the item we want to set the State in.
tvi.hItem = node.Handle;
tvi.mask = TVIF_HANDLE | TVIF_STATE;
// Left shift 8 to put info in bits 8 to 11
tvi.state = (uint)overlayIndex << 8;
// activate the overlay information
tvi.stateMask = TVIS_OVERLAYMASK;
// Send the TVM_SETITEM message.
SendMessage(node.TreeView.Handle, TVM_SETITEM, IntPtr.Zero, ref tvi);
}
public bool Find(String name, out IntPtr foundItem, out IntPtr previousSelected)
{
IntPtr item = (IntPtr)SendMessage(r_hwnd, TVM_GETNEXTITEM, TVGN_ROOT, 0);
foundItem = IntPtr.Zero;
previousSelected = IntPtr.Zero;
while (item != IntPtr.Zero)
{
TVITEM tvItem = new TVITEM();
IntPtr pszText = LocalAlloc(0x40, MY_MAXLVITEMTEXT);
tvItem.hItem = item;
tvItem.cchTextMax = MY_MAXLVITEMTEXT;
tvItem.pszText = (int)pszText;
tvItem.stateMask = TVIS_SELECTED;
tvItem.mask = TVIF_TEXT | TVIF_STATE;
int bGetItemPtr = SendMessageTVI(r_hwnd, TVM_GETITEM, 0, ref tvItem);
String buffer = Marshal.PtrToStringUni((IntPtr)tvItem.pszText, MY_MAXLVITEMTEXT);
LocalFree(pszText);
int len = buffer.IndexOf('\0');
if (len > 0)
{
buffer = buffer.Substring(0, len);
}
buffer = buffer.Trim();
if (buffer == name)
{
foundItem = item;
}
else if ((tvItem.state & TVIS_SELECTED) == TVIS_SELECTED)
{
previousSelected = item;
}
item = (IntPtr)SendMessage(r_hwnd, TVM_GETNEXTITEM, TVGN_NEXT, (uint)item.ToInt32());
}
return(foundItem != IntPtr.Zero);
}
/// <summary>
/// Associates an overlay image with a tree node. The overlay image is taken from the normal
/// image list of the tree view the node is contained in. Also the overlay image must have been
/// made available by <see cref="SetOverlayImage(ImageList,int,int)"/>.
/// </summary>
/// <param name="node">node to associate the overlay with</param>
/// <param name="overlayIndex">index between 1 and 5 indicating the overlay image to use or 0 to indicate no image</param>
public static void SetOverlayIndex(TreeNode node, int overlayIndex)
{
if (overlayIndex < 0 || overlayIndex > 5)
{
throw new ArgumentOutOfRangeException("overlayIndex", overlayIndex, "overlay image must be between 0 and 5");
}
TVITEM tvi = new TVITEM();
// Define the item we want to set the State in.
tvi.hItem = node.Handle;
tvi.mask = TVIF_HANDLE | TVIF_STATE;
// Left shift 8 to put info in bits 8 to 11
tvi.state = (uint)overlayIndex << 8;
// activate the overlay information
tvi.stateMask = TVIS_OVERLAYMASK;
// Send the TVM_SETITEM message.
SendMessage(node.TreeView.Handle, TVM_SETITEM, IntPtr.Zero, ref tvi);
}
public bool Find(String name, out IntPtr foundItem, out IntPtr previousSelected)
{
IntPtr item = (IntPtr)SendMessage(r_hwnd, TVM_GETNEXTITEM, TVGN_ROOT, 0);
foundItem = IntPtr.Zero;
previousSelected = IntPtr.Zero;
while (item != IntPtr.Zero)
{
TVITEM tvItem = new TVITEM();
IntPtr pszText = LocalAlloc(0x40, MY_MAXLVITEMTEXT);
tvItem.hItem = item;
tvItem.cchTextMax = MY_MAXLVITEMTEXT;
tvItem.pszText = (int)pszText;
tvItem.stateMask = TVIS_SELECTED;
tvItem.mask = TVIF_TEXT | TVIF_STATE;
int bGetItemPtr = SendMessageTVI(r_hwnd, TVM_GETITEM, 0, ref tvItem);
String buffer = Marshal.PtrToStringUni((IntPtr)tvItem.pszText, MY_MAXLVITEMTEXT);
LocalFree(pszText);
int len = buffer.IndexOf('\0');
if (len > 0)
{
buffer = buffer.Substring(0, len);
}
buffer = buffer.Trim();
if (buffer == name)
{
foundItem = item;
}
else if ((tvItem.state & TVIS_SELECTED) == TVIS_SELECTED)
{
previousSelected = item;
}
item = (IntPtr)SendMessage(r_hwnd, TVM_GETNEXTITEM, TVGN_NEXT, (uint)item.ToInt32());
}
return foundItem != IntPtr.Zero;
}
/// <summary>
/// Sets a value indicating if the checkbox is visible on the tree node.
/// </summary>
/// <param name="node">The tree node.</param>
/// <param name="value"><value>true</value> to make the checkbox visible on the tree node; otherwise <value>false</value>.</param>
public static void SetIsCheckBoxVisible(this TreeNode node, bool value)
{
if (node == null)
{
throw new ArgumentNullException("node");
}
if (node.TreeView == null)
{
throw new InvalidOperationException("The node does not belong to a tree.");
}
var tvi = new TVITEM
{
hItem = node.Handle,
mask = TVIF_STATE,
stateMask = TVIS_STATEIMAGEMASK,
state = (value ? node.Checked ? 2 : 1 : 0) << 12
};
var result = SendMessage(node.TreeView.Handle, TVM_SETITEM, IntPtr.Zero, ref tvi);
if (result == IntPtr.Zero)
{
throw new ApplicationException("Error setting TreeNode state.");
}
}
public static extern bool SendMessage(IntPtr hWnd, int msg, int wParam, ref TVITEM tvItem);
private static extern int SendMessageTVI(IntPtr hWnd, int wMsg, int wParam, ref TVITEM tvi);
private void HideCheckBox(TreeNode node)
{
TVITEM tvi = new TVITEM();
tvi.hItem = node.Handle;
tvi.mask = TVIF_STATE;
tvi.stateMask = TVIS_STATEIMAGEMASK;
tvi.state = 0;
IntPtr lparam = Marshal.AllocHGlobal(Marshal.SizeOf(tvi));
Marshal.StructureToPtr(tvi, lparam, false);
SendMessage(this.tvTags.Handle, TVM_SETITEM, IntPtr.Zero, lparam);
}
public static extern int SendMessage(int hWnd, Int32 msg, Int32 wParam, ref TVITEM tvItem);
private static extern IntPtr SendMessage(IntPtr hWnd, int Msg, IntPtr wParam,
ref TVITEM lParam);
public static extern IntPtr SendMessage(IntPtr hwnd, int msg, int wparam, ref TVITEM lparam);
public static extern bool WriteProcessMemory(int hProcess, int lpBaseAddress,
ref TVITEM buffer, int dwSize, int lpNumberOfBytesWritten);
internal static extern bool WriteProcessMemory(IntPtr hProcess, IntPtr lpBaseAddress, ref TVITEM buffer, int dwSize, IntPtr lpNumberOfBytesWritten);
public static extern int SendMessage(int hWnd, Int32 msg, Int32 wParam, ref TVITEM tvItem);
public static extern IntPtr SendMessage(IntPtr hWnd, Int32 msg, Int32 wParam, ref TVITEM tvItem);
public static extern IntPtr SendMessage(IntPtr hWnd, int msg, int wParam, ref TVITEM lParam);
/// <summary>
/// Sets a value indicating if the checkbox is visible on the tree node.
/// </summary>
/// <param name="node">The tree node.</param>
/// <param name="isVisible"><value>true</value> to make the checkbox visible on the tree node; otherwise <value>false</value>.</param>
public static void SetIsCheckBoxVisible(this TreeNode node, bool isVisible, bool applyToSubtree = false)
{
if (node.TreeView == null)
throw new InvalidOperationException("The node does not belong to a tree.");
var tvi = new TVITEM
{
hItem = node.Handle,
mask = TVIF_STATE,
stateMask = TVIS_STATEIMAGEMASK,
state = (isVisible ? node.Checked ? 2 : 1 : 0) << 12
};
var result = SendMessage(node.TreeView.Handle, TVM_SETITEM, IntPtr.Zero, ref tvi);
if (result == IntPtr.Zero)
throw new ApplicationException("Error setting TreeNode state.");
if (applyToSubtree)
{
foreach (var childNode in node.GetTreeNodes())
{
childNode.SetIsCheckBoxVisible(isVisible, applyToSubtree);
}
}
}
public static extern int SendMessage(
IntPtr hwnd, uint msg, uint wParam, ref TVITEM lParam);
public static extern Int32 SendMessage(int hWnd, int Msg, int wParam,
TVITEM tvi);
static extern IntPtr SendMessageTVI(IntPtr hWnd, UInt32 Msg, IntPtr wParam, ref TVITEM tvi);
private void RemoveCheckboxOnNode(TreeNode node)
{
TVITEM tvItem = new TVITEM();
tvItem.hItem = node.Handle;
tvItem.mask = TVIF_STATE;
tvItem.stateMask = TVIS_STATEIMAGEMASK;
tvItem.state = 0;
IntPtr lparam = Marshal.AllocHGlobal(Marshal.SizeOf(tvItem));
try
{
Marshal.StructureToPtr(tvItem, lparam, false);
SendMessage(_groupsTreeView.Handle, TVM_SETITEM, IntPtr.Zero, lparam);
}
finally
{
Marshal.FreeHGlobal(lparam);
}
}
public static extern IntPtr SendMessage(IntPtr hWnd, int msg, int wParam, ref TVITEM lParam);
public CheckBoxState GetTreeNodeState(TriStateTreeNode node)
{
TVITEM tvItem = new TVITEM();
tvItem.mask = TVIF_HANDLE | TVIF_STATE;
tvItem.hItem = node.Handle;
tvItem.stateMask = TVIS_STATEIMAGEMASK;
tvItem.state = 0;
IntPtr ptr = SendMessage(this.Handle, TVM_GETITEM, 0, ref tvItem);
if (ptr != null)
{
//State image index in bits 12..15
int iState = tvItem.state >> 12;
if (iState == (int)CheckBoxState.None)
return CheckBoxState.None;
if (iState == (int)CheckBoxState.Unchecked)
return CheckBoxState.Unchecked;
if (iState == (int)CheckBoxState.Checked)
return CheckBoxState.Checked;
if (iState == (int)CheckBoxState.Indeterminate)
return CheckBoxState.Indeterminate;
}
return CheckBoxState.None;
}
public static extern bool WriteProcessMemory( int hProcess, int lpBaseAddress, ref TVITEM buffer, int dwSize, int lpNumberOfBytesWritten );
private void TreeViewControl_DrawNode(object sender, DrawTreeNodeEventArgs e)
{
// Disable the checkbox for top level nodes such as Views and Sprocs if they have no children.
if (e.Node.Level == 0
&& e.Node.Nodes.Count == 0)
{
var tvi = new TVITEM
{
hItem = e.Node.Handle,
mask = TVIF_STATE,
stateMask = TVIS_STATEIMAGEMASK,
state = 1 << 12
};
var lparam = IntPtr.Zero;
try
{
lparam = Marshal.AllocHGlobal(Marshal.SizeOf(tvi));
Marshal.StructureToPtr(tvi, lparam, false);
NativeMethods.SendMessage(treeView.Handle, TVM_SETITEM, IntPtr.Zero, lparam);
}
finally
{
if (lparam != IntPtr.Zero)
{
Marshal.FreeHGlobal(lparam);
}
}
}
e.DrawDefault = true;
}
public static extern Int32 SendMessage(int hWnd, int Msg, int wParam, TVITEM tvi);
public static extern IntPtr SendMessage(IntPtr hWnd, UInt32 Msg, IntPtr wParam, ref TVITEM lParam);
public void SetTreeNodeState(TriStateTreeNode node, CheckBoxState state)
{
if (node == null)
return;
TVITEM tvItem = new TVITEM();
tvItem.mask = TVIF_HANDLE | TVIF_STATE;
tvItem.hItem = node.Handle;
tvItem.stateMask = TVIS_STATEIMAGEMASK;
//State image index in bits 12..15
tvItem.state = ((int)state) << 12;
SendMessage(this.Handle, TVM_SETITEM, 0, ref tvItem);
}
private static extern UInt32 SendMessage(IntPtr hWnd, UInt32 msg,
UInt32 wParam, ref TVITEM lParam);
private static extern IntPtr SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, ref TVITEM lParam);
internal static extern IntPtr SendMessage(IntPtr hWnd, UInt32 msg, IntPtr wParam, ref TVITEM lParam);
private static extern IntPtr SendMessage(IntPtr hWnd, [MarshalAs(UnmanagedType.U4)] int msg, IntPtr wParam, ref TVITEM item);
/// <summary>
/// Gets a value indicating if the checkbox is visible on the tree node.
/// </summary>
/// <param name="node">The tree node.</param>
/// <returns><value>true</value> if the checkbox is visible on the tree node; otherwise <value>false</value>.</returns>
public static bool IsCheckBoxVisible(this TreeNode node)
{
if (node == null)
throw new ArgumentNullException("node");
if (node.TreeView == null)
throw new InvalidOperationException("The node does not belong to a tree.");
var tvi = new TVITEM
{
hItem = node.Handle,
mask = TVIF_STATE
};
var result = SendMessage(node.TreeView.Handle, TVM_GETITEM, node.Handle, ref tvi);
if (result == IntPtr.Zero)
throw new ApplicationException("Error getting TreeNode state.");
var imageIndex = (tvi.state & TVIS_STATEIMAGEMASK) >> 12;
return (imageIndex != 0);
}
public static extern IntPtr SendMessage(IntPtr hwnd, int msg, int wparam, ref TVITEM lparam);
/// <summary>
/// Hides the checkbox for the specified node on a TreeView control.
/// </summary>
private void HideCheckBox(TreeView tvw, TreeNode node)
{
TVITEM tvi = new TVITEM();
if (node.Handle != null)
{
try
{
tvi.hItem = node.Handle;
tvi.mask = TVIF_STATE;
tvi.stateMask = TVIS_STATEIMAGEMASK;
tvi.state = 0;
SendMessage(tvw.Handle, TVM_SETITEM, IntPtr.Zero, ref tvi);
}
catch (Exception ex)
{
Hanbo.Log.LogManager.Error(ex);
}
}
}
