条形码绘制

引言

我正在寻找一个 C# 示例，演示如何在各种格式中绘制条形码，但找不到“2 of 5 interleaved”（2/5 交错）格式的示例，因此我参考了 这里 的一些指导，编写了自己的代码。

关注点

要使用此代码，只需将其粘贴到 Visual Studio 2005 中新建 C# Windows 项目的默认窗体中即可。在窗体上放置一个PictureBox控件，并将该控件的“Image”属性设置为 print2of5Interleaved() 方法的输出，例如：pictureBox1.Image=print2of5Interleaved();。

public Bitmap Print2of5Interleaved()
{
string Content = "12345678";
string CheckSum = CalcCheckSum(Content);
string startcode = "1010";
string stopcode = "1101";
int startX = 0;
int startY = 0;
int endY = startY + 40;
int curX;
int sectionIndex = 0;
int pairIndex = 0;
int barIndex = 0;
int spaceIndex = 0;

Graphics g;
Bitmap bmp = new Bitmap(100, 80);
g = Graphics.FromImage(bmp);

curX = startX;
Content = Content + CheckSum;
if ((Content.Length % 2) != 0)
{
//odd number, fill in a leading zero
Content = "0" + Content;
}
//draw the start marker
foreach (char digit in startcode)
{
if (digit == '1')
{
g.DrawLine(Pens.Black, curX, startY, curX, endY);
curX += 1;
}
else
{
curX += 1;
}
}
//draw the content
for (int i = 0; i < Content.Length; i += 2)
{
string pair = Content.Substring(i, 2);
string barPattern = Get2of5Pattern(pair.Substring(0, 1));
string spacePattern = Get2of5Pattern(pair.Substring(1, 1));
barIndex = 0;
spaceIndex = 0;
sectionIndex = 0;
while (sectionIndex < 10)
{
if ((sectionIndex % 2) == 0)
{
//bar 0,2,4,6,8 positions
pairIndex = 0;
if (barPattern.Substring(barIndex, 1) == "W")
{
//draw wide bar
while (pairIndex < 2)
{
g.DrawLine(Pens.Black, curX + pairIndex, startY, curX + pairIndex, endY);
pairIndex++;
}
curX = curX + 2;
}
else
{
//draw narrow bar
g.DrawLine(Pens.Black, curX + pairIndex, startY, curX + pairIndex, endY);
curX = curX + 1;
}
barIndex++;
}
else
{
//space 1,3,5,7,8 positions
if (spacePattern.Substring(spaceIndex, 1) == "W")
{
//simulate drawing a wide white space
curX = curX + 2;
}
else
{
//simulate drawing a narrow white space
curX = curX + 1;
}
spaceIndex++;
}
sectionIndex += 1;
}
}
//draw the stop marker
foreach (char digit in stopcode)
{
if (digit == '1')
{
g.DrawLine(Pens.Black, curX, startY, curX, endY);
curX += 1;
}
else
{
curX += 1;
}
}
return bmp;
} 

以下是这两个辅助方法的代码

public string CalcCheckSum(string CheckNum)
{
int i;
int j;
int checkval = 0;
j = 3;
i = CheckNum.Length - 1;
while (i > 0)
{
checkval += Convert.ToInt32(CheckNum.Substring(i, 1)) * j;
j = j ^ 2;
i -= 1;
}
checkval = (10 - (checkval % 10)) % 10;
return checkval.ToString();
}

public string Get2of5Pattern(string letter)
{
string tmpPattern = "";
switch (letter)
{
case "0":
tmpPattern = "NNWWN";
break;
case "1":
tmpPattern = "WNNNW";
break;
case "2":
tmpPattern = "NWNNW";
break;
case "3":
tmpPattern = "WWNNN";
break;
case "4":
tmpPattern = "NNWNW";
break;
case "5":
tmpPattern = "WNWNN";
break;
case "6":
tmpPattern = "NWWNN";
break;
case "7":
tmpPattern = "NNNWW";
break;
case "8":
tmpPattern = "WNNWN";
break;
case "9":
tmpPattern = "NWNWN";
break;
}
return tmpPattern;
} 

关注点

如果有人使用条形码扫描仪测试此代码并遇到任何问题，请告诉我！

历史

• 2007 年 8 月 9 日：初始发布