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// 6 april 2015
#include "uipriv_windows.h"
#define MBTWC(str, wstr, bufsiz) MultiByteToWideChar(CP_UTF8, 0, str, -1, wstr, bufsiz)
WCHAR *toUTF16(const char *str)
{
WCHAR *wstr;
int n;
n = MBTWC(str, NULL, 0);
if (n == 0)
logLastError("error figuring out number of characters to convert to in toUTF16()");
wstr = (WCHAR *) uiAlloc(n * sizeof (WCHAR), "WCHAR[]");
if (MBTWC(str, wstr, n) != n)
logLastError("error converting from UTF-8 to UTF-16 in toUTF16()");
return wstr;
}
// TODO this and resize(): initialize size and other values to avoid garbage on failure
intmax_t uiWindowsWindowTextWidth(HWND hwnd)
{
int len;
WCHAR *text;
HDC dc;
HFONT prevfont;
SIZE size;
// TODO check for error
len = GetWindowTextLengthW(hwnd);
if (len == 0) // no text; nothing to do
return 0;
text = (WCHAR *) uiAlloc((len + 1) * sizeof (WCHAR), "WCHAR[]");
if (GetWindowText(hwnd, text, len + 1) == 0) // should only happen on error given explicit test for len == 0 above
logLastError("error getting window text in uiWindowsWindowTextWidth()");
dc = GetDC(hwnd);
if (dc == NULL)
logLastError("error getting DC in uiWindowsWindowTextWidth()");
prevfont = (HFONT) SelectObject(dc, hMessageFont);
if (prevfont == NULL)
logLastError("error loading control font into device context in uiWindowsWindowTextWidth()");
if (GetTextExtentPoint32W(dc, text, len, &size) == 0)
logLastError("error getting text extent point in uiWindowsWindowTextWidth()");
if (SelectObject(dc, prevfont) != hMessageFont)
logLastError("error restoring previous font into device context in uiWindowsWindowTextWidth()");
if (ReleaseDC(hwnd, dc) == 0)
logLastError("error releasing DC in uiWindowsWindowTextWidth()");
uiFree(text);
return size.cx;
}
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