public void PutText(string text)
{
if (!Open())
{
// Technically this is a reason to throw exception, but it should be rare and it will indicate
// that clipboard is being heavily used and content of the clipboard might be unpredictable even if Open succeeds.
return;
}
IntPtr dataHandle = IntPtr.Zero;
try
{
Win32API.EmptyClipboard();
dataHandle = Win32API.GlobalAlloc(GlobalAllocFlags.GMEM_MOVEABLE, (IntPtr)((text.Length + 1) * sizeof(char)));
if (dataHandle == IntPtr.Zero)
{
throw new IOException("Failed to allocate memory for the clipboard data.");
}
IntPtr dataPtr = Win32API.GlobalLock(dataHandle);
try
{
Marshal.Copy(text.ToCharArray(), 0, dataPtr, text.Length);
Marshal.WriteInt16(dataPtr, sizeof(char) * text.Length, '\0');
}
finally
{
Win32API.GlobalUnlock(dataHandle);
}
if (Win32API.SetClipboardData(Win32ClipboardFormat.CF_UNICODETEXT, dataHandle) != IntPtr.Zero)
{
// If SetClipboardData succeeds, then handle ownership is transferred to the system and it should not be freed by the application.
dataHandle = IntPtr.Zero;
}
}
finally
{
Win32API.CloseClipboard();
if (dataHandle != IntPtr.Zero)
{
Win32API.GlobalFree(dataHandle);
}
}
}
public bool TryGetText(out string text)
{
if (!Open())
{
text = null;
return(false);
}
try
{
var formats = new[] { Win32ClipboardFormat.CF_UNICODETEXT };
int format = Win32API.GetPriorityClipboardFormat(formats, formats.Length);
if (format <= 0)
{
text = null;
return(false);
}
IntPtr dataHandle = Win32API.GetClipboardData((Win32ClipboardFormat)format);
if (dataHandle == IntPtr.Zero)
{
text = null;
return(false);
}
IntPtr dataPtr = Win32API.GlobalLock(dataHandle);
if (dataPtr == IntPtr.Zero)
{
text = null;
return(false);
}
try
{
text = Marshal.PtrToStringUni(dataPtr);
return(true);
}
finally
{
Win32API.GlobalUnlock(dataHandle);
}
}
finally
{
Win32API.CloseClipboard();
}
}