public static extern bool GetTextMetrics(IntPtr hdc, out TEXTMETRIC tm);
internal static extern bool GetTextMetrics(HDC hdc, out TEXTMETRIC tm);
internal static int LengthInBufferCells(string str, int offset, bool checkEscapeSequences)
{
Dbg.Assert(offset >= 0, "offset >= 0");
Dbg.Assert(string.IsNullOrEmpty(str) || (offset < str.Length), "offset < str.Length");
var escapeSequenceAdjustment = 0;
if (checkEscapeSequences)
{
int i = 0;
while (i < offset)
{
ControlSequenceLength(str, ref i);
}
// If offset != i, we're in the middle of a sequence, which the caller should avoid,
// but we'll tolerate.
while (i < str.Length)
{
escapeSequenceAdjustment += ControlSequenceLength(str, ref i);
}
}
uint codePage = NativeMethods.GetConsoleOutputCP();
if (!IsAvailableFarEastCodePage(codePage))
{
return str.Length - offset - escapeSequenceAdjustment;
}
HWND hwnd = (HWND)0;
HDC hDC = (HDC)0;
bool istmInitialized = false;
TEXTMETRIC tm = new TEXTMETRIC(); ;
int length = 0;
try
{
int n = str.Length;
for (int i = offset; i < n; i++)
{
char c = str[i];
length += LengthInBufferCellsFE(c, ref hwnd, ref hDC, ref istmInitialized, ref tm);
}
return length - escapeSequenceAdjustment;
}
finally
{
if (hwnd != (IntPtr)0 && hDC != (IntPtr)0)
{
NativeMethods.ReleaseDC(hwnd, hDC);
}
}
}
private static int LengthInBufferCells(char c, uint codePage)
{
if (!IsAvailableFarEastCodePage(codePage))
{
return 1;
}
HWND hwnd = (HWND)0;
HDC hDC = (HDC)0;
bool istmInitialized = false;
TEXTMETRIC tm = new TEXTMETRIC(); ;
try
{
return LengthInBufferCellsFE(c, ref hwnd, ref hDC, ref istmInitialized, ref tm);
}
finally
{
if (hwnd != (IntPtr)0 && hDC != (IntPtr)0)
{
NativeMethods.ReleaseDC(hwnd, hDC);
}
}
}
/// <summary>
/// From IsConsoleFullWidth in \windows\core\ntcon\server\dbcs.c
/// Precondition: the current code page needs to be a Far East code page.
///
/// char F8F8 makes this function return 1 while in CHT, CHS, and KOR it takes 2 cells.
/// I don't think we should special-case this because that ought to be a bug outside of
/// this code.
/// </summary>
/// <param name="c"></param>
/// <param name="hwnd">window handle</param>
/// <param name="hDC">handle to DC; it is not released by this method</param>
/// <param name="istmInitialized"></param>
/// <param name="tm"></param>
/// <returns></returns>
private static int LengthInBufferCellsFE(char c, ref HWND hwnd, ref HDC hDC, ref bool istmInitialized, ref TEXTMETRIC tm)
{
if (0x20 <= c && c <= 0x7e)
{
/* ASCII */
return 1;
}
else if (0x3041 <= c && c <= 0x3094)
{
/* Hiragana */
return 2;
}
else if (0x30a1 <= c && c <= 0x30f6)
{
/* Katakana */
return 2;
}
else if (0x3105 <= c && c <= 0x312c)
{
/* Bopomofo */
return 2;
}
else if (0x3131 <= c && c <= 0x318e)
{
/* Hangul Elements */
return 2;
}
else if (0xac00 <= c && c <= 0xd7a3)
{
/* Korean Hangul Syllables */
return 2;
}
else if (0xff01 <= c && c <= 0xff5e)
{
/* Fullwidth ASCII variants */
return 2;
}
else if (0xff61 <= c && c <= 0xff9f)
{
/* Halfwidth Katakana variants */
return 1;
}
else if ((0xffa0 <= c && c <= 0xffbe) ||
(0xffc2 <= c && c <= 0xffc7) ||
(0xffca <= c && c <= 0xffcf) ||
(0xffd2 <= c && c <= 0xffd7) ||
(0xffda <= c && c <= 0xffdc))
{
/* Halfwidth Hangule variants */
return 1;
}
else if (0xffe0 <= c && c <= 0xffe6)
{
/* Fullwidth symbol variants */
return 2;
}
else if (0x4e00 <= c && c <= 0x9fa5)
{
/* Han Ideographic */
return 2;
}
else if (0xf900 <= c && c <= 0xfa2d)
{
/* Han Compatibility Ideographs */
return 2;
}
else
{
// GetTextMetrics / GetCharWidth32 exist in an extension API set 'ext-ms-win-gdi-font-l1-1-1.dll', which is not available in NanoServer.
#if !CORECLR
/* Unknown character: need to use GDI*/
if (hDC == (IntPtr)0)
{
hwnd = NativeMethods.GetConsoleWindow();
if ((IntPtr)0 == hwnd)
{
int err = Marshal.GetLastWin32Error();
//Don't throw exception so that output can continue
tracer.TraceError("Win32 Error 0x{0:X} occurred when getting the window handle to the console.",
err);
return 1;
}
hDC = NativeMethods.GetDC(hwnd);
if ((IntPtr)0 == hDC)
{
int err = Marshal.GetLastWin32Error();
//Don't throw exception so that output can continue
tracer.TraceError("Win32 Error 0x{0:X} occurred when getting the Device Context of the console window.",
err);
return 1;
}
}
bool result = true;
if (!istmInitialized)
{
result = NativeMethods.GetTextMetrics(hDC, out tm);
if (!result)
{
int err = Marshal.GetLastWin32Error();
//Don't throw exception so that output can continue
tracer.TraceError("Win32 Error 0x{0:X} occurred when getting the Text Metric of the console window's Device Context.",
err);
return 1;
}
istmInitialized = true;
}
int width;
result = NativeMethods.GetCharWidth32(hDC, (uint)c, (uint)c, out width);
if (!result)
{
int err = Marshal.GetLastWin32Error();
//Don't throw exception so that output can continue
tracer.TraceError("Win32 Error 0x{0:X} occurred when getting the width of a char.",
err);
return 1;
}
if (width >= tm.tmMaxCharWidth)
{
return 2;
}
#endif
}
tracer.WriteLine("failed to locate char {0}, return 1", (int)c);
return 1;
}
public static extern bool GetTextMetrics(IntPtr hdc, out TEXTMETRIC tm);