|
private GlobalLock ( |
||
| h | ||
| return | ||
internal static IntPtr CopyHGlobal(IntPtr data)
{
IntPtr src = UnsafeNativeMethods.GlobalLock(data);
int size = UnsafeNativeMethods.GlobalSize(data);
IntPtr ptr = Marshal.AllocHGlobal(size);
IntPtr buffer = UnsafeNativeMethods.GlobalLock(ptr);
try
{
for (int i = 0; i < size; i++)
{
byte val = Marshal.ReadByte(new IntPtr((long)src + i));
Marshal.WriteByte(new IntPtr((long)buffer + i), val);
}
}
finally
{
if (buffer != IntPtr.Zero)
{
UnsafeNativeMethods.GlobalUnLock(buffer);
}
if (src != IntPtr.Zero)
{
UnsafeNativeMethods.GlobalUnLock(src);
}
}
return(ptr);
}
public static SafeGlobalAllocHandle CopyHGlobal(SafeGlobalAllocHandle data)
{
IntPtr src = UnsafeNativeMethods.GlobalLock(data);
UIntPtr size = UnsafeNativeMethods.GlobalSize(data);
SafeGlobalAllocHandle ptr = UnsafeNativeMethods.GlobalAlloc(0, size);
IntPtr buffer = UnsafeNativeMethods.GlobalLock(ptr);
try
{
UnsafeNativeMethods.MoveMemory(buffer, src, size);
}
finally
{
if (buffer != IntPtr.Zero)
{
UnsafeNativeMethods.GlobalUnlock(ptr);
}
if (src != IntPtr.Zero)
{
UnsafeNativeMethods.GlobalUnlock(data);
}
}
return(ptr);
}
private IntPtr PackageSelectionData(StringBuilder sb, bool addEndFormatDelimiter)
{
if (sb == null || sb.ToString().Length == 0 || this.ItemsDraggedOrCutOrCopied.Count == 0)
{
return(IntPtr.Zero);
}
// Double null at end.
if (addEndFormatDelimiter)
{
if (sb.ToString()[sb.Length - 1] != '\0')
{
sb.Append('\0');
}
}
// We request unmanaged permission to execute the below.
new SecurityPermission(SecurityPermissionFlag.UnmanagedCode).Demand();
_DROPFILES df = new _DROPFILES();
int dwSize = Marshal.SizeOf(df);
Int16 wideChar = 0;
int dwChar = Marshal.SizeOf(wideChar);
int structSize = dwSize + ((sb.Length + 1) * dwChar);
IntPtr ptr = Marshal.AllocHGlobal(structSize);
df.pFiles = dwSize;
df.fWide = 1;
IntPtr data = IntPtr.Zero;
try
{
data = UnsafeNativeMethods.GlobalLock(ptr);
Marshal.StructureToPtr(df, data, false);
IntPtr strData = new IntPtr((long)data + dwSize);
DragDropHelper.CopyStringToHGlobal(sb.ToString(), strData, structSize);
}
finally
{
if (data != IntPtr.Zero)
{
UnsafeNativeMethods.GlobalUnLock(data);
}
}
return(ptr);
}
/// <summary>
/// Returns the data packed after the DROPFILES structure.
/// </summary>
/// <param name="dropHandle"></param>
/// <returns></returns>
internal static string GetData(IntPtr dropHandle)
{
IntPtr data = UnsafeNativeMethods.GlobalLock(dropHandle);
try
{
_DROPFILES df = (_DROPFILES)Marshal.PtrToStructure(data, typeof(_DROPFILES));
if (df.fWide != 0)
{
IntPtr pdata = new IntPtr((long)data + df.pFiles);
return(Marshal.PtrToStringUni(pdata));
}
}
finally
{
if (data != null)
{
UnsafeNativeMethods.GlobalUnLock(data);
}
}
return(null);
}