【C语言应用】如何用C代码生成一维码？
【C语言应用】如何用C代码生成一维码？ 描述
前面的文章《如何用C代码生成二维码》中已经介绍过了libzint开源库，我们也见识到了它的便捷性。本文将以如何生成一维码为核心，浅谈其他的实现方式和代码技巧。
《如何用C代码生成二维码》文章中已经介绍了，我们通过自行封装zint开源库处理的接口函数如下：
/****************************************************************************
Descpribe: Create Qrcode API with C Code by calling zint lib.
Input : pQrCodeData, the qrcode data buf
QrcodeLen, the len of qrcode data, but it can be 0
pQrCodeFile, the output file name of qrcode, it can be NULL
Output : pZintRet, to store the ret code from linzint.
Return : 0 is ok, and other values are fail. See the meanings in enum ZINT_RET_CODE
Notes : pQrCodeFile, Must end in .png, .eps or .svg. when isn,t NULL string.
****************************************************************************/
ZINT_RET_CODE Zint_Create_QrCode(uint8_t *pQrCodeData, int QrcodeLen, char *pQrCodeFile, int *pZintRet);
类似地，我们生成一维码的接口函数也相近，如下所示：
/****************************************************************************
Descpribe: Create Barcode API with C Code by calling zint lib.
Input : pBarCodeData, the barcode data buf
BarcodeLen, the len of barcode data, but it can be 0
pBarCodeFile, the output file name of barcode, it can be NULL
Output : pZintRet, to store the ret code from linzint.
Return : 0 is ok, and other values are fail. See the meanings in enum ZINT_RET_CODE
Notes : pBarCodeFile, Must end in .png, .eps or .svg. when isn,t NULL string.
****************************************************************************/
ZINT_RET_CODE Zint_Create_BarCode(uint8_t *pBarCodeData, int BarcodeLen, char *pBarCodeFile, int *pZintRet);
两者几乎是一个模板刻出来的，可想而知，其内部实现，自然也是逻辑都是差不多的，都是调用到libzint中的：
ZINT_EXTERN struct zint_symbol* ZBarcode_Create(void);
ZINT_EXTERN void ZBarcode_Clear(struct zint_symbol *symbol);
ZINT_EXTERN void ZBarcode_Delete(struct zint_symbol *symbol);
ZINT_EXTERN int ZBarcode_Encode_and_Print(struct zint_symbol *symbol, unsigned char *input, int length, int rotate_angle);
等等函数。于是，我们就在想，可以把调用libzint库中的函数封装成一个共用的功能函数，然后生成一维码和生产二维码的函数都通过传不同的参数进去，让这个共用的功能函数走不同case就可以完成相应的功能了。于是我们开始改造zint_code.c，将这个功能函数提出取出来，命名为 ZINT_RET_CODE Zint_Create_Code_File(STR_ZINT_CODE *ZintCodeObj);
通过这个功能函数的入口，我们可以知道，我们定义了一个STR_ZINT_CODE结构体，里面的成员变量如下所列：
typedef struct
{
uint8_t *pCodeData;
int CodeLen;
char *pCodeFile;
CODE_TYPE CodeType;
int MaxCodeLen;
int *pZintRet;
}STR_ZINT_CODE; //struct for create code file
这样我们就可以通过入参控制Zint_Create_Code_File函数来执行不同的生成功能了。
以下是改造后的zint_code.c和zint_code.h
/****************************************************************************
* File : zint_code.c
*
* Copyright (c) 2011 by Li.Recan < 721317716@qq.com >
*
* DESCRIPTION: Demo for creating qrcode by C code.
*
* Modification history
* --------------------------------------------------------------------------
* Date Version Author History
* --------------------------------------------------------------------------
* 2016-10-15 1.0.0 Li.Recan written
***************************************************************************/
// Standard Library
#include
#include
// so Library
#include "zint.h"
// Project Header
#include "zint_code.h"
/****************************************************************************
Descpribe: Create Code file API with C Code by calling zint lib.
It's a common api for create barcode or qrcode.
Input : ZintCodeObj, the zint create code file object
Output : ZintCodeObj, the zint create code file object
Return : 0 is ok, and other values are fail. See the meanings in enum ZINT_RET_CODE
Notes : null
****************************************************************************/
ZINT_RET_CODE Zint_Create_Code_File(STR_ZINT_CODE *ZintCodeObj)
{
struct zint_symbol *pMySymbol = NULL;
int RetCode = 0;
int CodeTypeIn = 0;
if(!ZintCodeObj) //check input pointer
{
return ZINT_ERR_INV_DATA;
}
//check code type
if(ZINT_BARCODE == ZintCodeObj->CodeType)
{
CodeTypeIn = BARCODE_CODE128;
}
else if(ZINT_QRCODE == ZintCodeObj->CodeType)
{
CodeTypeIn = BARCODE_QRCODE;
}
if(ZintCodeObj->CodeLen == 0)
{
ZintCodeObj->CodeLen = strlen((char *)ZintCodeObj->pCodeData);
}
if(ZintCodeObj->CodeLen > ZintCodeObj->MaxCodeLen)//len is too long
{
return ZINT_ERR_TOO_LONG;
}
if(0 == ZBarcode_ValidID(CodeTypeIn))
{
return ZINT_ERR_INV_CODE_ID;
}
pMySymbol = ZBarcode_Create();
if(pMySymbol == NULL)
{
return ZINT_ERR_MEMORY;
}
if(ZintCodeObj->pCodeFile)//when it's NULL, outfile will be "out.png"
{
if(strstr(ZintCodeObj->pCodeFile, "png") || (strstr(ZintCodeObj->pCodeFile, "eps")) || (strstr(ZintCodeObj->pCodeFile, "svg")))
{
strcpy(pMySymbol->outfile, ZintCodeObj->pCodeFile);
}
else
{
ZBarcode_Clear(pMySymbol);
ZBarcode_Delete(pMySymbol); //release memory in zint lib
return ZINT_ERR_FILE_NAME;
}
}
pMySymbol->symbology = CodeTypeIn;
if(BARCODE_QRCODE == CodeTypeIn) // special for qrcode
{
pMySymbol->option_1 = 3; //ECC Level.It can be large when ECC Level is larger.(value:1-4)
pMySymbol->scale = 4; //contorl qrcode file size, default is 1, used to be 4
}
pMySymbol->border_width = 2; //set white space width around your qrcode and 0 is for nothing
RetCode = ZBarcode_Encode_and_Print(pMySymbol, ZintCodeObj->pCodeData, ZintCodeObj->CodeLen, 0);
ZBarcode_Clear(pMySymbol);
ZBarcode_Delete(pMySymbol); //release memory in zint lib
if(ZintCodeObj->pZintRet)
{
*(ZintCodeObj->pZintRet) = RetCode; //save ret code from zint lib
}
return ((0 == RetCode) ? (ZINT_OK) : (ZINT_ERR_LIB_RET));
}
/****************************************************************************
Descpribe: Create Barcode API with C Code by calling zint lib.
Input : pBarCodeData, the barcode data buf
BarcodeLen, the len of barcode data, but it can be 0
pBarCodeFile, the output file name of barcode, it can be NULL
Output : pZintRet, to store the ret code from linzint.
Return : 0 is ok, and other values are fail. See the meanings in enum ZINT_RET_CODE
Notes : pBarCodeFile, Must end in .png, .eps or .svg. when isn,t NULL string.
****************************************************************************/
ZINT_RET_CODE Zint_Create_BarCode(uint8_t *pBarCodeData, int BarcodeLen, char *pBarCodeFile, int *pZintRet)
{
STR_ZINT_CODE ZintCodeObj;
memset(&ZintCodeObj, 0, sizeof(STR_ZINT_CODE));
ZintCodeObj.pCodeData = pBarCodeData;
ZintCodeObj.CodeLen = BarcodeLen;
ZintCodeObj.pCodeFile = pBarCodeFile;
ZintCodeObj.pZintRet = pZintRet;
ZintCodeObj.CodeType = ZINT_BARCODE;
ZintCodeObj.MaxCodeLen = BARCODE_MAX_LEN;
return Zint_Create_Code_File(&ZintCodeObj);
}
/****************************************************************************
Descpribe: Create Qrcode API with C Code by calling zint lib.
Input : pQrCodeData, the qrcode data buf
QrcodeLen, the len of qrcode data, but it can be 0
pQrCodeFile, the output file name of qrcode, it can be NULL
Output : pZintRet, to store the ret code from linzint.
Return : 0 is ok, and other values are fail. See the meanings in enum ZINT_RET_CODE
Notes : pQrCodeFile, Must end in .png, .eps or .svg. when isn,t NULL string.
****************************************************************************/
ZINT_RET_CODE Zint_Create_QrCode(uint8_t *pQrCodeData, int QrcodeLen, char *pQrCodeFile, int *pZintRet)
{
STR_ZINT_CODE ZintCodeObj;
memset(&ZintCodeObj, 0, sizeof(STR_ZINT_CODE));
ZintCodeObj.pCodeData = pQrCodeData;
ZintCodeObj.CodeLen = QrcodeLen;
ZintCodeObj.pCodeFile = pQrCodeFile;
ZintCodeObj.pZintRet = pZintRet;
ZintCodeObj.CodeType = ZINT_QRCODE;
ZintCodeObj.MaxCodeLen = QRCODE_MAX_LEN;
return Zint_Create_Code_File(&ZintCodeObj);
}
/****************************************************************************
* File : zint_code.h
*
* Copyright (c) 2011 by Li.Recan < 721317716@qq.com >
*
* DESCRIPTION: API for creating qrcode by C code.
*
* Modification history
* --------------------------------------------------------------------------
* Date Version Author History
* --------------------------------------------------------------------------
* 2016-10-15 1.0.0 Li.Recan written
***************************************************************************/
#ifndef __ZINT_CODE__
#define __ZINT_CODE__
#ifdef __cplusplus
extern "C"
{
#endif
#include
#define QRCODE_MAX_LEN 500 //max string len for creating qrcode
#define BARCODE_MAX_LEN 100 //max string len for creating barcode
typedef enum
{
ZINT_OK = 0,
ZINT_ERR_INV_DATA = -1, //input invalid data
ZINT_ERR_TOO_LONG = -2, //len for input data is too long
ZINT_ERR_INV_CODE_ID = -3,//the code type is not supported by zint
ZINT_ERR_MEMORY = -4, //malloc memory error in zint lib
ZINT_ERR_FILE_NAME = -5, //qrcode file isn'y end in .png, .eps or .svg.
ZINT_ERR_LIB_RET = -6, //zint lib ret error, real ret code should be zint api ret code
}ZINT_RET_CODE;
typedef enum
{
ZINT_BARCODE = 1, //barcode type
ZINT_QRCODE = 2, //qrcode type
}CODE_TYPE;
typedef struct
{
uint8_t *pCodeData;
int CodeLen;
char *pCodeFile;
CODE_TYPE CodeType;
int MaxCodeLen;
int *pZintRet;
}STR_ZINT_CODE; //struct for create code file
/****************************************************************************
Descpribe: Create Barcode API with C Code by calling zint lib.
Input : pBarCodeData, the barcode data buf
BarcodeLen, the len of barcode data, but it can be 0
pBarCodeFile, the output file name of barcode, it can be NULL
Output : pZintRet, to store the ret code from linzint.
Return : 0 is ok, and other values are fail. See the meanings in enum ZINT_RET_CODE
Notes : pBarCodeFile, Must end in .png, .eps or .svg. when isn,t NULL string.
****************************************************************************/
ZINT_RET_CODE Zint_Create_BarCode(uint8_t *pBarCodeData, int BarcodeLen, char *pBarCodeFile, int *pZintRet);
/****************************************************************************
Descpribe: Create Qrcode API with C Code by calling zint lib.
Input : pQrCodeData, the qrcode data buf
QrcodeLen, the len of qrcode data, but it can be 0
pQrCodeFile, the output file name of qrcode, it can be NULL
Output : pZintRet, to store the ret code from linzint.
Return : 0 is ok, and other values are fail. See the meanings in enum ZINT_RET_CODE
Notes : pQrCodeFile, Must end in .png, .eps or .svg. when isn,t NULL string.
****************************************************************************/
ZINT_RET_CODE Zint_Create_QrCode(uint8_t *pQrCodeData, int QrcodeLen, char *pQrCodeFile, int *pZintRet);
#define Debuging(fmt, arg...) printf("[%20s, %4d] "fmt, __FILE__, __LINE__, ##arg)
#ifdef __cplusplus
}
#endif
#endif /* __ZINT_CODE__ */
下面我们通过一个demo程序来验证下接口函数，即qrcode_test.c源程序，以下为其全部内容。
/****************************************************************************
* File : qrcode_test.c
*
* Copyright (c) 2011 by Li.Recan < 721317716@qq.com >
*
* DESCRIPTION: Demo for creating qrcode by C code.
*
* Modification history
* --------------------------------------------------------------------------
* Date Version Author History
* --------------------------------------------------------------------------
* 2016-10-15 1.0.0 Li.Recan written
***************************************************************************/
// Standard Library
#include
// Project Header
#include "zint_code.h"
int main(int argc, char *argv[])
{
int ZintLibRet = 0; //ret code from zint lib
ZINT_RET_CODE ZintRet = 0; //ret code from zint_code api
char QrcodeData[] = "I love zint lib. 测试一下gbk编码 ...";
char QrcodeDataDef[] = "This's default qrcode file name : out.png ";
char QrcodeFile[] = "MyQrcode.png"; // Must end in .png, .eps or .svg. //zint lib ask !
char BarcodeData[] = "13430931801"; //barcode string
char BarcodeFile[] = "MyBarcode.png";
//test with inputing qrcode_file name
ZintRet = Zint_Create_QrCode((uint8_t*)QrcodeData, 0, QrcodeFile, &ZintLibRet);
if(ZINT_OK != ZintRet)
{
Debuging("Create qrcode err, ZintRet = %d, ZintLibRet = %d\n", ZintRet, ZintLibRet);
}
else
{
Debuging("Create qrcode OK ! \nView qrcode file : %s in cur path. ZintRet = %d, ZintLibRet = %d\n", QrcodeFile, ZintRet, ZintLibRet);
}
//test without inputing qrcode_file name
ZintRet = Zint_Create_QrCode((uint8_t*)QrcodeDataDef, 0, NULL, &ZintLibRet);
if(ZINT_OK != ZintRet)
{
Debuging("Create qrcode err, ZintRet = %d, ZintLibRet = %d\n", ZintRet, ZintLibRet);
}
else
{
Debuging("Create qrcode OK ! \nView qrcode file : out.png in cur path. ZintRet = %d, ZintLibRet = %d\n", ZintRet, ZintLibRet);
}
//test create barcode with name "MyBarcode.png"
ZintRet = Zint_Create_BarCode((uint8_t*)BarcodeData, 0, BarcodeFile, &ZintLibRet);
if(ZINT_OK != ZintRet)
{
Debuging("Create barcode err, ZintRet = %d, ZintLibRet = %d\n", ZintRet, ZintLibRet);
}
else
{
Debuging("Create barcode OK ! \nView barcode file : %s in cur path. ZintRet = %d, ZintLibRet = %d\n", BarcodeFile, ZintRet, ZintLibRet);
}
return 0;
}
前半部分还是保留上一次测试生产二维码的代码；而新增了生成一维码的测试代码。
编辑
之后再运行demo程序，如下：
如框框所示，即为成功运行程序，生成的一维码图片。它的展示如下：
用微信等扫一扫工具，扫描结果如下：
结果正如我们代码所写，证明程序执行是没有问题的。
好了，本期如何用C代码生成一维码就介绍到这里了。有兴趣的童鞋可以私下联系，互相学习。
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