public int Find(char[] characterSet, int start, int end)
{
System.Windows.Forms.NativeMethods.CHARRANGE charrange;
bool flag = true;
bool negate = false;
int textLength = this.TextLength;
if (characterSet == null)
{
throw new ArgumentNullException("characterSet");
}
if ((start < 0) || (start > textLength))
{
throw new ArgumentOutOfRangeException("start", System.Windows.Forms.SR.GetString("InvalidBoundArgument", new object[] { "start", start, 0, textLength }));
}
if ((end < start) && (end != -1))
{
throw new ArgumentOutOfRangeException("end", System.Windows.Forms.SR.GetString("InvalidLowBoundArgumentEx", new object[] { "end", end, "start" }));
}
if (characterSet.Length == 0)
{
return -1;
}
int windowTextLength = System.Windows.Forms.SafeNativeMethods.GetWindowTextLength(new HandleRef(this, base.Handle));
if (start == end)
{
start = 0;
end = windowTextLength;
}
if (end == -1)
{
end = windowTextLength;
}
charrange = new System.Windows.Forms.NativeMethods.CHARRANGE {
cpMax = charrange.cpMin = start
};
System.Windows.Forms.NativeMethods.TEXTRANGE lParam = new System.Windows.Forms.NativeMethods.TEXTRANGE {
chrg = new System.Windows.Forms.NativeMethods.CHARRANGE()
};
lParam.chrg.cpMin = charrange.cpMin;
lParam.chrg.cpMax = charrange.cpMax;
System.Windows.Forms.UnsafeNativeMethods.CharBuffer buffer = System.Windows.Forms.UnsafeNativeMethods.CharBuffer.CreateBuffer(0x201);
lParam.lpstrText = buffer.AllocCoTaskMem();
if (lParam.lpstrText == IntPtr.Zero)
{
throw new OutOfMemoryException();
}
try
{
bool flag3 = false;
while (!flag3)
{
if (flag)
{
lParam.chrg.cpMin = charrange.cpMax;
lParam.chrg.cpMax += 0x200;
}
else
{
lParam.chrg.cpMax = charrange.cpMin;
lParam.chrg.cpMin -= 0x200;
if (lParam.chrg.cpMin < 0)
{
lParam.chrg.cpMin = 0;
}
}
if (end != -1)
{
lParam.chrg.cpMax = Math.Min(lParam.chrg.cpMax, end);
}
int num3 = (int) System.Windows.Forms.UnsafeNativeMethods.SendMessage(new HandleRef(this, base.Handle), 0x44b, 0, lParam);
if (num3 == 0)
{
charrange.cpMax = charrange.cpMin = -1;
goto Label_02F4;
}
buffer.PutCoTaskMem(lParam.lpstrText);
string str = buffer.GetString();
if (flag)
{
for (int i = 0; i < num3; i++)
{
if (this.GetCharInCharSet(str[i], characterSet, negate))
{
flag3 = true;
continue;
}
charrange.cpMax++;
}
}
else
{
int num5 = num3;
while (num5-- != 0)
{
if (this.GetCharInCharSet(str[num5], characterSet, negate))
{
flag3 = true;
continue;
}
charrange.cpMin--;
}
}
}
}
finally
{
if (lParam.lpstrText != IntPtr.Zero)
{
Marshal.FreeCoTaskMem(lParam.lpstrText);
}
}
Label_02F4:
return (flag ? charrange.cpMax : charrange.cpMin);
}
private string CharRangeToString(System.Windows.Forms.NativeMethods.CHARRANGE c)
{
System.Windows.Forms.NativeMethods.TEXTRANGE lParam = new System.Windows.Forms.NativeMethods.TEXTRANGE {
chrg = c
};
if ((c.cpMax > this.Text.Length) || ((c.cpMax - c.cpMin) <= 0))
{
return string.Empty;
}
int size = (c.cpMax - c.cpMin) + 1;
System.Windows.Forms.UnsafeNativeMethods.CharBuffer buffer = System.Windows.Forms.UnsafeNativeMethods.CharBuffer.CreateBuffer(size);
IntPtr ptr = buffer.AllocCoTaskMem();
if (ptr == IntPtr.Zero)
{
throw new OutOfMemoryException(System.Windows.Forms.SR.GetString("OutOfMemory"));
}
lParam.lpstrText = ptr;
int num1 = (int) System.Windows.Forms.UnsafeNativeMethods.SendMessage(new HandleRef(this, base.Handle), 0x44b, 0, lParam);
buffer.PutCoTaskMem(ptr);
if (lParam.lpstrText != IntPtr.Zero)
{
Marshal.FreeCoTaskMem(ptr);
}
return buffer.GetString();
}