Type a page name and press Enter. You'll jump to the page if it exists, or you can create it if it doesn't.
To create a page in a module other than gdi32, prefix the name with the module name and a period.
/// <summary>The GetCharABCWidthsFloat function retrieves the widths, in logical units, of consecutive
/// characters in a specified range from the current font.</summary>
/// <param name="hdc">Handle to the device context.</param>
/// <param name="iFirstChar">Specifies the code point of the first character in the group of consecutive
/// characters where the ABC widths are seeked.</param>
/// <param name="iLastChar">Specifies the code point of the last character in the group of consecutive
/// characters where the ABC widths are seeked. This range is inclusive. An error is returned if the
/// specified last character precedes the specified first character.</param>
/// <param name="lpABCF">Pointer to an array of ABCFLOAT structures that receives the character widths,
/// in logical units.</param>
/// Unlike the GetCharABCWidths function that returns widths only for TrueType fonts, the GetCharABCWidthsFloat
/// function retrieves widths for any font. The widths returned by this function are in the IEEE floating-point
/// If the current world-to-device transformation is not identified, the returned widths may be noninteger
/// values, even if the corresponding values in the device space are integers.
/// A spacing is the distance added to the current position before placing the glyph. B spacing is the width of
/// the black part of the glyph. C spacing is the distance added to the current position to provide white space
/// to the right of the glyph. The total advanced width is specified by A+B+C.
/// The ABC spaces are measured along the character base line of the selected font.
/// The ABC widths of the default character are used for characters outside the range of the currently selected
/// <returns><para>If the function succeeds, the return value is nonzero.</para>
/// <para>If the function fails, the return value is zero.</para></returns>
private static extern bool GetCharABCWidthsFloat(IntPtr hdc, uint iFirstChar, uint iLastChar, [Out] ABCFloat lpABCF);
/// <summary>Helper methods for fonts to be able to get the widths of each character from the start to the end.</summary>
/// <param name="font"></param>
/// <param name="start"></param>
/// <param name="end"></param>
public static double getCharacterWidths(Font font, uint start, uint end)
IntPtr hDC = GetDC(IntPtr.Zero); //Screen DC
IntPtr hFont = font.ToHfont();
IntPtr hObjOld = SelectObject(hDC, hFont);
ABCFloat values = new ABCFloat[end - start];
GetCharABCWidthsFloat(hDC, start, end, values);
ReleaseDC(IntPtr.Zero, hDC); // release that device context.
//transfer those floats to doubles.
double result = new double[values.Length];
for (int i = 0; i < values.Length; i++)
result[i] = values[i].abcfB + ((values[i].abcfA + values[i].abcfC) * 0.5);
/// <summary>The ABCFLOAT structure contains the A, B, and C widths of a font character.</summary>
/// The A, B, and C widths are measured along the base line of the font.
/// The character increment (total width) of a character is the sum of the A, B, and C spaces. Either the A or
/// the C space can be negative to indicate underhangs or overhangs.
private struct ABCFloat
/// <summary>Specifies the A spacing of the character. The A spacing is the distance to add to the current
/// position before drawing the character glyph.</summary>
public float abcfA;
/// <summary>Specifies the B spacing of the character. The B spacing is the width of the drawn portion of
/// the character glyph.</summary>
public float abcfB;
/// <summary>Specifies the C spacing of the character. The C spacing is the distance to add to the current
/// position to provide white space to the right of the character glyph.</summary>
public float abcfC;
Alternative Managed API:
Do you know one? Please contribute it!
The GetCharABCWidthsFloat API
3/24/2023 11:18:52 AM - 18.104.22.168
Please edit this page!
Do you have...
helpful tips or sample code to share for using this API in managed code?
corrections to the existing content?
variations of the signature you want to share?
additional languages you want to include?
Select "Edit This Page" on the right hand toolbar and edit it! Or add new pages containing supporting types needed for this API (structures, delegates, and more).