public async Task <string> GetTextAsync()
{
await OpenClipboard();
try
{
IntPtr hText = UnmanagedMethods.GetClipboardData(UnmanagedMethods.ClipboardFormat.CF_UNICODETEXT);
if (hText == IntPtr.Zero)
{
return(null);
}
var pText = UnmanagedMethods.GlobalLock(hText);
if (pText == IntPtr.Zero)
{
return(null);
}
var rv = Marshal.PtrToStringUni(pText);
UnmanagedMethods.GlobalUnlock(hText);
return(rv);
}
finally
{
UnmanagedMethods.CloseClipboard();
}
}
private async Task <IDisposable> OpenClipboard()
{
while (!UnmanagedMethods.OpenClipboard(IntPtr.Zero))
{
await Task.Delay(100);
}
return(Disposable.Create(() => UnmanagedMethods.CloseClipboard()));
}
public async Task ClearAsync()
{
await OpenClipboard();
try
{
UnmanagedMethods.EmptyClipboard();
}
finally
{
UnmanagedMethods.CloseClipboard();
}
}
private async Task <IDisposable> OpenClipboard()
{
var i = OleRetryCount;
while (!UnmanagedMethods.OpenClipboard(IntPtr.Zero))
{
if (--i == 0)
{
throw new TimeoutException("Timeout opening clipboard.");
}
await Task.Delay(100);
}
return(Disposable.Create(() => UnmanagedMethods.CloseClipboard()));
}
public async Task SetTextAsync(string text)
{
if (text == null)
{
throw new ArgumentNullException(nameof(text));
}
await OpenClipboard();
try
{
var hGlobal = Marshal.StringToHGlobalUni(text);
UnmanagedMethods.SetClipboardData(UnmanagedMethods.ClipboardFormat.CF_UNICODETEXT, hGlobal);
}
finally
{
UnmanagedMethods.CloseClipboard();
}
}