Screenshot of Main Dialog
The Library file presented is Barcode.h under Lib directory contains inline C++ code for:
The library file is targeted to Win32, so it can be used by both MFC and Win32 programs.
All classes are almost the same from the user's point of view, only 2 functions are needed to be used.
For example, class for Code39 is
Call default constructor first, then call the following 2 functions:
BOOL Encode39(const char*pszCodeIn);
void Draw39(HDC hDC,int iX,int iY0,int iY1,const COLORREF clrBar,
const COLORREF clrSpace,const int iPenW);
Parameters of the above functions:
string to be encoded, i.e. "1234567890"
iX: start horizontal position to draw the barcode
iY1: start and end vertical positions to draw the barcode
clrSpace: colors of bar and space
iPenW: width of pen to draw the barcode
Array for Bars and Spaces
A byte array is defined in
BarcodeBase class as
Each byte of the array represents a bar or space, bits of the byte are encoded in the format:
First 6 bits are not used.
Last bit is flagged for bar or space.
Last second bit is flagged for wide or narrow.
So, value of the byte means:
- 0x00 = a narrow space
- 0x01 = a narrow bar
- 0x02 = a wide space
- 0x03 = a wide bar
BarcodeEan13 is special: Last third bit is used by the class to indicate if the bar (space) is longer than others.
The sample is a dialog based MFC program. The main dialog is in borderless style, when edit-box Move (refer to picture below) gets focus, user can use arrow keys of up, down, left and right to move main dialog. This feature allows you to compare barcode drawn on main dialog with other barcode programs easily. You also can use mouse to drag main dialog by clicking on it as clicking on caption of normal windows.
- OnTop/OnNormal: Set the program as top-most-window or not
- Close: Close the program
- Help: Display this HTML file
- Print: Print barcode
- Style: Barcode styles or symbologies
- Map: Map-mode used
- Move: Move main dialog by arrow keys once it gets focus
- Code: String to be encoded
- X,Y,Height: For print positions, unit is in logic points
- Pen width: Width of one bar or space
MapModes (such as
MM_HIENGLISH) cannot be displayed properly on screen, you have to test them by printing.
This sample and library file are my test program for barcode, which doesn't include second part: dynamical bitmap of barcode generated from encoding.
Why do I test barcode with bitmap? Here is the answer:
As we know, there are three methods for printing:
- By drawing such as
- By Bitmap such as
- By fonts such as
Barcode must be printed clearly with high qualities. The only way to print a good barcode is by fonts. If you try to use the code for commercial purposes, the result is very disappointing because this program does not use fonts.
- Barcode serial articles by Mr. Neil Van Eps
- Articles by Mr. Lam Do Thanh
- 29th March, 2006: Initial post