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Created December 11, 2012 14:31
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Font Metrics Using oldschool API
namespace pinvokeGetTextMetrics
using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using System.Runtime.InteropServices;
class pinvokeMapped {
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
internal struct TEXTMETRIC
public int tmHeight;
public int tmAscent;
public int tmDescent;
public int tmInternalLeading;
public int tmExternalLeading;
public int tmAveCharWidth;
public int tmMaxCharWidth;
public int tmWeight;
public int tmOverhang;
public int tmDigitizedAspectX;
public int tmDigitizedAspectY;
public char tmFirstChar;
public char tmLastChar;
public char tmDefaultChar;
public char tmBreakChar;
public byte tmItalic;
public byte tmUnderlined;
public byte tmStruckOut;
public byte tmPitchAndFamily;
public byte tmCharSet;
public static TEXTMETRIC GetTextMetrics(Graphics graphics, Font font)
IntPtr hDC = graphics.GetHdc();
TEXTMETRIC textMetric;
IntPtr hFont = font.ToHfont();
IntPtr hFontPreviouse = SelectObject(hDC, hFont);
bool result = GetTextMetrics(hDC, out textMetric);
SelectObject(hDC, hFontPreviouse);
return textMetric;
[DllImport("Gdi32.dll", CharSet=CharSet.Auto)]
public static extern IntPtr SelectObject(IntPtr hdc, IntPtr hgdiobj);
[DllImport("Gdi32.dll", CharSet=CharSet.Auto)]
public static extern bool GetTextMetrics(IntPtr hdc, out TEXTMETRIC lptm);
[DllImport("Gdi32.dll", CharSet=CharSet.Auto)]
public static extern bool DeleteObject(IntPtr hdc);
partial class Form1
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.IContainer components = null;
protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)
Graphics g = e.Graphics;
FontFamily fontFamily = new FontFamily("Liberation Sans");
Font liberation = new Font(fontFamily, 16, FontStyle.Regular, GraphicsUnit.Pixel);
pinvokeMapped.TEXTMETRIC liberationMetrics = pinvokeMapped.GetTextMetrics(g, liberation);
g.DrawString("Liberation Sans Metrics on this GC: tmAscent: " + liberationMetrics.tmAscent +
" tmDescent: " + liberationMetrics.tmDescent +
" tmHeight " + liberationMetrics.tmHeight,
liberation, System.Drawing.Brushes.Blue, new Point(30, 30));
/// <summary>
/// Clean up any resources being used.
/// </summary>
/// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
protected override void Dispose(bool disposing)
if (disposing && (components != null))
#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
// Form1
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(677, 211);
this.Name = "Form1";
this.Text = "Form1";
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