C语言生成二维码

使用到的库：libzint

环境：centos

需要安装的环境:  

gcc / cmake / zlib-devel /libpng-devel (均使用yum安装即可)

1、下载zint

https://sourceforge.net/projects/zint/

2、安装zint

tar xvf zint-2.9.1-src.tar.gz

cd zint-2.9.1-src

mkdir build

cd build/

编译安装
[root@cc build]# cmake ..
-- The C compiler identification is GNU 8.3.1
-- The CXX compiler identification is GNU 8.3.1
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Performing Test CXX_COMPILER_FLAG_WALL
-- Performing Test CXX_COMPILER_FLAG_WALL - Success
-- Found ZLIB: /usr/lib64/libz.so (found version "1.2.11") 
-- Found PNG: /usr/lib64/libpng.so (found version "1.6.34") 
CMake Warning at CMakeLists.txt:84 (find_package):
  By not providing "FindQt5UiTools.cmake" in CMAKE_MODULE_PATH this project
  has asked CMake to find a package configuration file provided by
  "Qt5UiTools", but CMake did not find one.

  Could not find a package configuration file provided by "Qt5UiTools" with
  any of the following names:

    Qt5UiToolsConfig.cmake
    qt5uitools-config.cmake

  Add the installation prefix of "Qt5UiTools" to CMAKE_PREFIX_PATH or set
  "Qt5UiTools_DIR" to a directory containing one of the above files.  If
  "Qt5UiTools" provides a separate development package or SDK, be sure it has
  been installed.


-- Configuring done
-- Generating done
-- Build files have been written to: /opt/zint-2.9.1-src/build

[root@cc build]# make -j4
Scanning dependencies of target zint
[  4%] Building C object backend/CMakeFiles/zint.dir/vector.c.o
[  4%] Building C object backend/CMakeFiles/zint.dir/ps.c.o
[  6%] Building C object backend/CMakeFiles/zint.dir/svg.c.o
[  8%] Building C object backend/CMakeFiles/zint.dir/emf.c.o
[ 10%] Building C object backend/CMakeFiles/zint.dir/bmp.c.o
[ 12%] Building C object backend/CMakeFiles/zint.dir/pcx.c.o
[ 14%] Building C object backend/CMakeFiles/zint.dir/gif.c.o
[ 16%] Building C object backend/CMakeFiles/zint.dir/png.c.o
[ 18%] Building C object backend/CMakeFiles/zint.dir/tif.c.o
[ 20%] Building C object backend/CMakeFiles/zint.dir/raster.c.o
[ 22%] Building C object backend/CMakeFiles/zint.dir/output.c.o
[ 24%] Building C object backend/CMakeFiles/zint.dir/common.c.o
[ 26%] Building C object backend/CMakeFiles/zint.dir/library.c.o
[ 28%] Building C object backend/CMakeFiles/zint.dir/large.c.o
[ 30%] Building C object backend/CMakeFiles/zint.dir/reedsol.c.o
[ 32%] Building C object backend/CMakeFiles/zint.dir/gs1.c.o
[ 34%] Building C object backend/CMakeFiles/zint.dir/eci.c.o
[ 36%] Building C object backend/CMakeFiles/zint.dir/general_field.c.o
[ 38%] Building C object backend/CMakeFiles/zint.dir/sjis.c.o
[ 40%] Building C object backend/CMakeFiles/zint.dir/gb2312.c.o
[ 42%] Building C object backend/CMakeFiles/zint.dir/gb18030.c.o
[ 44%] Building C object backend/CMakeFiles/zint.dir/code.c.o
[ 46%] Building C object backend/CMakeFiles/zint.dir/code128.c.o
[ 48%] Building C object backend/CMakeFiles/zint.dir/2of5.c.o
[ 50%] Building C object backend/CMakeFiles/zint.dir/upcean.c.o
[ 52%] Building C object backend/CMakeFiles/zint.dir/telepen.c.o
[ 54%] Building C object backend/CMakeFiles/zint.dir/medical.c.o
[ 56%] Building C object backend/CMakeFiles/zint.dir/plessey.c.o
[ 58%] Building C object backend/CMakeFiles/zint.dir/rss.c.o
[ 60%] Building C object backend/CMakeFiles/zint.dir/postal.c.o
[ 62%] Building C object backend/CMakeFiles/zint.dir/auspost.c.o
[ 64%] Building C object backend/CMakeFiles/zint.dir/imail.c.o
[ 66%] Building C object backend/CMakeFiles/zint.dir/mailmark.c.o
[ 68%] Building C object backend/CMakeFiles/zint.dir/code16k.c.o
[ 70%] Building C object backend/CMakeFiles/zint.dir/codablock.c.o
[ 72%] Building C object backend/CMakeFiles/zint.dir/dmatrix.c.o
[ 74%] Building C object backend/CMakeFiles/zint.dir/pdf417.c.o
[ 76%] Building C object backend/CMakeFiles/zint.dir/qr.c.o
[ 78%] Building C object backend/CMakeFiles/zint.dir/maxicode.c.o
[ 80%] Building C object backend/CMakeFiles/zint.dir/composite.c.o
[ 82%] Building C object backend/CMakeFiles/zint.dir/aztec.c.o
[ 84%] Building C object backend/CMakeFiles/zint.dir/code49.c.o
[ 86%] Building C object backend/CMakeFiles/zint.dir/code1.c.o
[ 88%] Building C object backend/CMakeFiles/zint.dir/gridmtx.c.o
[ 90%] Building C object backend/CMakeFiles/zint.dir/hanxin.c.o
[ 92%] Building C object backend/CMakeFiles/zint.dir/dotcode.c.o
[ 94%] Building C object backend/CMakeFiles/zint.dir/ultra.c.o
[ 96%] Linking C shared library libzint.so
[ 96%] Built target zint
Scanning dependencies of target zint_frontend
[ 98%] Building C object frontend/CMakeFiles/zint_frontend.dir/main.c.o
[100%] Linking C executable zint
[100%] Built target zint_frontend

[root@cc build]# make install
[ 96%] Built target zint
[100%] Built target zint_frontend
Install the project...
-- Install configuration: "RelWithDebInfo"
-- Up-to-date: /usr/local/share/apps/cmake/modules/FindZint.cmake
-- Installing: /usr/local/lib/libzint.so.2.9.0
-- Up-to-date: /usr/local/lib/libzint.so.2.9
-- Up-to-date: /usr/local/lib/libzint.so
-- Up-to-date: /usr/local/include/zint.h
-- Installing: /usr/local/bin/zint

3、测试安装是否成功

 

 

 

 4、Demo测试产生二维码

  4-1 zint_code.h

#ifndef __ZINT_CODE__
#define __ZINT_CODE__

#ifdef __cplusplus
extern "C"
{
#endif

#include <stdint.h>

#define QRCODE_MAX_LEN        500 //max string len for creating qrcode

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;

/****************************************************************************
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__ */

4-2 zint_code.c

#include <string.h>
#include <stdio.h>

// so Library
#include "zint.h"

// Project Header
#include "zint_code.h"


/****************************************************************************
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)
{
    struct zint_symbol *pMySymbol = NULL;
    int RetCode                   = 0;

    if(!pQrCodeData) //check input pointer
    {
        return ZINT_ERR_INV_DATA;
    }

    if(QrcodeLen == 0)
    {
        QrcodeLen = strlen((char *)pQrCodeData);
    }
    if(QrcodeLen > QRCODE_MAX_LEN)//len is too long
    {
        return ZINT_ERR_TOO_LONG;
    }

    if(0 == ZBarcode_ValidID(BARCODE_QRCODE))
    {
        return ZINT_ERR_INV_CODE_ID;
    }

    pMySymbol = ZBarcode_Create();
    if(pMySymbol == NULL)
    {
        return ZINT_ERR_MEMORY;
    }

    if(pQrCodeFile)//when it's NULL, outfile will be "out.png"
    {
        if(strstr(pQrCodeFile, "png") || (strstr(pQrCodeFile, "eps")) || (strstr(pQrCodeFile, "svg")))
        {
            strcpy(pMySymbol->outfile, pQrCodeFile);
        }
        else
        {
            ZBarcode_Clear(pMySymbol);
            ZBarcode_Delete(pMySymbol); //release memory in zint lib
            return ZINT_ERR_FILE_NAME;
        }
    }
    pMySymbol->symbology    = BARCODE_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, pQrCodeData, QrcodeLen, 0);
    ZBarcode_Clear(pMySymbol);
    ZBarcode_Delete(pMySymbol); //release memory in zint lib

    if(pZintRet)
    {
        *pZintRet = RetCode; //save ret code from zint lib
    }

    return ((0 == RetCode) ? (ZINT_OK) : (ZINT_ERR_LIB_RET));
}

4-3 qrcode_test.c

/****************************************************************************
  * File       : qrcode_test.c
  *
  * Copyright (c) Marshu
  *
  * DESCRIPTION: Demo for creating qrcode by C code.
  *
  * Modification history
  * --------------------------------------------------------------------------
  * Date         Version  Author       History
  * --------------------------------------------------------------------------
  * 2021-02-25   1.0.0    Marshu     written
  *
  * Need to install:
  * yum -y install zlib-devel; yum -y install libpng-devel; libzint library
  *
  * zint download link: 
  *    https://sourceforge.net/projects/zint/
  ***************************************************************************/

#include <stdio.h>
#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[]     = "Test zint QRCode. 测试一下gbk编码 ...";
    char QrcodeFile[]     = "MyQrcode.png"; // Must end in .png, .eps or .svg. //zint lib ask !

    //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 ! View qrcode file : %s in cur path. ZintRet = %d, ZintLibRet = %d\n", QrcodeFile, ZintRet, ZintLibRet);
    }

    return 0;
}

5、编译代码

gcc -o qrcode_test -lzint zint_code.c zint_code.h qrcode_test.c 

6、运行代码

[root@cc home]# ./qrcode_test 
./qrcode_test: error while loading shared libraries: libzint.so.2.9: cannot open shared object file: No such file or directory

出现上述运行错误，修改一下如下路径
export LD_LIBRARY_PATH=/usr/local/lib

[root@cc home]# ./qrcode_test 
[       qrcode_test.c,   40] Create qrcode OK ! View qrcode file : MyQrcode.png in cur path. ZintRet = 0, ZintLibRet = 0

 

END