41 lines
1.3 KiB
C
41 lines
1.3 KiB
C
// 6 april 2015
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#include "uipriv_windows.h"
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intmax_t uiWindowsWindowTextWidth(HWND hwnd)
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{
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LRESULT len;
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WCHAR *text;
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HDC dc;
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HFONT prevfont;
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SIZE size;
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size.cx = 0;
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size.cy = 0;
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// first we need the window text
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len = SendMessageW(hwnd, WM_GETTEXTLENGTH, 0, 0);
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if (len == 0) // no text; nothing to do
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return 0;
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text = (WCHAR *) uiAlloc((len + 1) * sizeof (WCHAR), "WCHAR[]");
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// note the comparison: the size includes the null terminator, but the return does not
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if (GetWindowText(hwnd, text, len + 1) != len)
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logLastError("error getting window text in uiWindowsWindowTextWidth()");
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// now we can do the calculations
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dc = GetDC(hwnd);
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if (dc == NULL)
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logLastError("error getting DC in uiWindowsWindowTextWidth()");
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prevfont = (HFONT) SelectObject(dc, hMessageFont);
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if (prevfont == NULL)
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logLastError("error loading control font into device context in uiWindowsWindowTextWidth()");
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if (GetTextExtentPoint32W(dc, text, len, &size) == 0)
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logLastError("error getting text extent point in uiWindowsWindowTextWidth()");
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if (SelectObject(dc, prevfont) != hMessageFont)
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logLastError("error restoring previous font into device context in uiWindowsWindowTextWidth()");
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if (ReleaseDC(hwnd, dc) == 0)
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logLastError("error releasing DC in uiWindowsWindowTextWidth()");
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uiFree(text);
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return size.cx;
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}
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