连接动态库编译
gcc -o demo demo.c zint_code.c -lzint
连接静态库编译
gcc -o demo demo.c zint_code.c -static -L. -lzint -lpng16 -lz -lm
a、把交叉编译链中的libz.a、libm.a拷贝到demo中
b、执行编译命令
arm-oe-linux-gnueabi-gcc -o demo demo.c zint_code.c -static -L. -lzint -lz -lm
#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[] = "https://translate.google.cn/";
char QrcodeFile[] = "demo.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;
}
zint_code.c
#include <string.h>
#include <stdio.h>
#include "zint.h"
#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 = 2; //ECC Level.It can be large when ECC Level is larger.(value:1-4)
pMySymbol->scale = 1.2; //contorl qrcode file size, default is 1, used to be 4
pMySymbol->border_width = 1; //set white space width around your qrcode and 0 is for nothing
#if 0 //生成png图片
RetCode = ZBarcode_Encode_and_Print(pMySymbol, pQrCodeData, QrcodeLen, 0);
#else //获取bmp的rgb值
ZBarcode_Encode_and_Buffer(pMySymbol, pQrCodeData, QrcodeLen, 0);
unsigned char r, g, b;
int i = 0;
for (int row = 0; row < pMySymbol->bitmap_height; ++row) {
for (int col = 0; col < pMySymbol->bitmap_width; ++col) {
r = pMySymbol->bitmap[i];
g = pMySymbol->bitmap[i + 1];
b = pMySymbol->bitmap[i + 2];
i += 3;
if (r == 0 && g == 0 & b == 0){
printf("■");
} else {
printf("□");
}
}
printf(" r:%d, g:%d, b:%d\n", r, g, b);
}
#endif
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));
}
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__ */
#include<stdio.h>
#include<string.h>
#include<malloc.h>
#include<stdlib.h>
#include<math.h>
#define SAFE_FREE(x) {free(x);x=NULL;}
#define BUFFER_SIZE 1024*1024
int main(){
unsigned int offset = 0;
FILE* sFile = fopen("1.png", "rb");
FILE* dFile = fopen("d.txt", "w");
FILE* txtFile = fopen("t.txt", "w");
unsigned char* buf=(unsigned char*)malloc(BUFFER_SIZE);
size_t nSize = fread(buf,1,BUFFER_SIZE, sFile);
unsigned char png[]={0x89,0x50,0x4e,0x47,0xd,0xa,0x1a,0xa};
for(;offset<8;offset++){
if(buf[offset]!=png[offset]){
printf("no png\n");
return 0;
}
}
while(offset<nSize){
unsigned int dataLen = 0;
for(unsigned int i=offset+4;offset<i;offset++){
dataLen+=buf[offset]*pow((double)256, (int)(i-offset-1));
}
if(buf[offset] == 'I' && buf[offset+1]=='D' &&buf[offset+2]=='A' &&buf[offset+3]=='T'){
int count = 0;
for(int i=0;i<dataLen;i++){
fprintf(txtFile,"0x%x ",buf[offset+4+i]);
count++;
}
printf("count:%d\n",count);
fprintf(txtFile,"\n\n\n\n");
}
for(char i=0;i<4;i++){
fprintf(dFile,"%c",buf[offset++]);
}
fprintf(dFile,"\n");
offset+=(dataLen+4);
}
fclose(sFile);
fclose(dFile);
fclose(txtFile);
SAFE_FREE(buf);
}
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <png.h>
#define PNG_BYTES_TO_CHECK 8
#define HAVE_ALPHA 1
#define NOT_HAVE_ALPHA 0
typedef struct _pic_data pic_data;
struct _pic_data {
int width, height; //长宽
int bit_depth; //位深度
int alpha_flag; //是否有透明通道
unsigned char *rgba;//实际rgb数据
};
int check_is_png(FILE **fp, const char *filename) //检查是否png文件
{
char checkheader[PNG_BYTES_TO_CHECK]; //查询是否png头
*fp = fopen(filename, "rb");
if (*fp == NULL) {
printf("open failed ...1\n");
return -1;
}
if (fread(checkheader, 1, PNG_BYTES_TO_CHECK, *fp) != PNG_BYTES_TO_CHECK) //读取png文件长度错误直接退出
return 0;
return png_sig_cmp(checkheader, 0, PNG_BYTES_TO_CHECK); //0正确, 非0错误
}
int decode_png(const char *filename, pic_data *out) //取出png文件中的rgb数据
{
png_structp png_ptr; //png文件句柄
png_infop info_ptr;//png图像信息句柄
int ret;
FILE *fp;
if (check_is_png(&fp, filename) != 0) {
printf("file is not png ...\n");
return -1;
}
printf("launcher[%s] ...\n", PNG_LIBPNG_VER_STRING); //打印当前libpng版本号
//1: 初始化libpng的数据结构 :png_ptr, info_ptr
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
info_ptr = png_create_info_struct(png_ptr);
//2: 设置错误的返回点
setjmp(png_jmpbuf(png_ptr));
rewind(fp); //等价fseek(fp, 0, SEEK_SET);
//3: 把png结构体和文件流io进行绑定
png_init_io(png_ptr, fp);
//4:读取png文件信息以及强转转换成RGBA:8888数据格式
png_read_png(png_ptr, info_ptr, PNG_TRANSFORM_EXPAND, 0); //读取文件信息
int channels, color_type;
channels = png_get_channels(png_ptr, info_ptr); //通道数量
color_type = png_get_color_type(png_ptr, info_ptr);//颜色类型
out->bit_depth = png_get_bit_depth(png_ptr, info_ptr);//位深度
out->width = png_get_image_width(png_ptr, info_ptr);//宽
out->height = png_get_image_height(png_ptr, info_ptr);//高
//if(color_type == PNG_COLOR_TYPE_PALETTE)
// png_set_palette_to_rgb(png_ptr);//要求转换索引颜色到RGB
//if(color_type == PNG_COLOR_TYPE_GRAY && out->bit_depth < 8)
// png_set_expand_gray_1_2_4_to_8(png_ptr);//要求位深度强制8bit
//if(out->bit_depth == 16)
// png_set_strip_16(png_ptr);//要求位深度强制8bit
//if(png_get_valid(png_ptr,info_ptr,PNG_INFO_tRNS))
// png_set_tRNS_to_alpha(png_ptr);
//if(color_type == PNG_COLOR_TYPE_GRAY || color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
// png_set_gray_to_rgb(png_ptr);//灰度必须转换成RG
printf("channels = %d color_type = %d bit_depth = %d width = %d height = %d ...\n",
channels, color_type, out->bit_depth, out->width, out->height);
int i, j, k;
int size, pos = 0;
int temp;
//5: 读取实际的rgb数据
png_bytepp row_pointers; //实际存储rgb数据的buf
row_pointers = png_get_rows(png_ptr, info_ptr); //也可以分别每一行获取png_get_rowbytes();
size = out->width * out->height; //申请内存先计算空间
if (channels == 4 || color_type == PNG_COLOR_TYPE_RGB_ALPHA) { //判断是24位还是32位
out->alpha_flag = HAVE_ALPHA; //记录是否有透明通道
size *= (sizeof(unsigned char) * 4); //size = out->width * out->height * channel
out->rgba = (png_bytep)malloc(size);
if (NULL == out->rgba) {
printf("malloc rgba faile ...\n");
png_destroy_read_struct(&png_ptr, &info_ptr, 0);
fclose(fp);
return -1;
}
//从row_pointers里读出实际的rgb数据出来
temp = channels - 1;
for (i = 0; i < out->height; i++)
for (j = 0; j < out->width * 4; j += 4)
for (k = temp; k >= 0; k--)
out->rgba[pos++] = row_pointers[i][j + k];
} else if (channels == 3 || color_type == PNG_COLOR_TYPE_RGB) { //判断颜色深度是24位还是32位
out->alpha_flag = NOT_HAVE_ALPHA;
size *= (sizeof(unsigned char) * 3);
out->rgba = (png_bytep)malloc(size);
if (NULL == out->rgba) {
printf("malloc rgba faile ...\n");
png_destroy_read_struct(&png_ptr, &info_ptr, 0);
fclose(fp);
return -1;
}
//从row_pointers里读出实际的rgb数据
temp = (3 * out->width);
for (i = 0; i < out->height; i ++) {
for (j = 0; j < temp; j += 3) {
out->rgba[pos++] = row_pointers[i][j+2];
out->rgba[pos++] = row_pointers[i][j+1];
out->rgba[pos++] = row_pointers[i][j+0];
}
}
} else return -1;
//6:销毁内存
png_destroy_read_struct(&png_ptr, &info_ptr, 0);
fclose(fp);
//此时, 我们的out->rgba里面已经存储有实际的rgb数据了
//处理完成以后free(out->rgba)
return 0;
}
int RotationRight90(unsigned char * src, int srcW, int srcH, int channel) //顺时针旋转90度
{
unsigned char * tempSrc = NULL; //临时的buf用来记录原始的图像(未旋转之前的图像)
int mSize = srcW * srcH * sizeof(char) * channel;
int i = 0;
int j = 0;
int k = 0;
int l = 3;
int desW = 0;
int desH = 0;
desW = srcH;
desH = srcW;
tempSrc = (unsigned char *)malloc(sizeof(char) * srcW * srcH * channel);
memcpy(tempSrc, src, mSize); //拷贝原始图像至tempbuf
for(i = 0; i < desH; i ++)
{
for(j = 0; j < desW; j ++)
{
for(k = 0; k < channel; k ++)
{
src[(i * desW + j) * channel + k] = tempSrc[((srcH - 1 - j) * srcW + i) * channel + k]; //替换像素
}
}
}
free(tempSrc);
return 0;
}
int write_png_file(const char *filename , pic_data *out) //生成一个新的png图像
{
png_structp png_ptr;
png_infop info_ptr;
png_byte color_type;
png_bytep * row_pointers;
FILE *fp = fopen(filename, "wb");
if (NULL == fp) {
printf("open failed ...2\n");
return -1;
}
//1: 初始化libpng结构体
png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0);
if (!png_ptr) {
printf("png_create_write_struct failed ...\n");
return -1;
}
//2: 初始化png_infop结构体 ,
//此结构体包含了图像的各种信息如尺寸,像素位深, 颜色类型等等
info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr) {
printf("png_create_info_struct failed ...\n");
return -1;
}
//3: 设置错误返回点
if (setjmp(png_jmpbuf(png_ptr))) {
printf("error during init_io ...\n");
return -1;
}
//4:绑定文件IO到Png结构体
png_init_io(png_ptr, fp);
if (setjmp(png_jmpbuf(png_ptr))) {
printf("error during init_io ...\n");
return -1;
}
if (out->alpha_flag == HAVE_ALPHA) color_type = PNG_COLOR_TYPE_RGB_ALPHA;
else color_type = PNG_COLOR_TYPE_RGB;
//5:设置以及写入头部信息到Png文件
png_set_IHDR(png_ptr, info_ptr, out->width, out->height, out->bit_depth,
color_type, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
png_write_info(png_ptr, info_ptr);
if (setjmp(png_jmpbuf(png_ptr))) {
printf("error during init_io ...\n");
return -1;
}
int channels, temp;
int i, j, pos = 0;
if (out->alpha_flag == HAVE_ALPHA) {
channels = 4;
temp = (4 * out->width);
printf("have alpha ...\n");
} else {
channels = 3;
temp = (3 * out->width);
printf("not have alpha ...\n");
}
// 顺时针旋转90度 , 旋转完了一定要把width 和height调换 不然得到的图像是花的 旋转三次就是逆时针旋转一次
//RotationRight90(out->rgba, out->width, out->height, channels);
//RotationRight90(out->rgba, out->height, out->width, channels);
//RotationRight90(out->rgba, out->width, out->height, channels);
row_pointers = (png_bytep*)malloc(out->height * sizeof(png_bytep));
for (i = 0; i < out->height; i++) {
row_pointers[i] = (png_bytep)malloc(temp* sizeof(unsigned char));
for (j = 0; j < temp; j += channels) {
if (channels == 4) {
row_pointers[i][j+3] = out->rgba[pos++];
row_pointers[i][j+2] = out->rgba[pos++];
row_pointers[i][j+1] = out->rgba[pos++];
row_pointers[i][j+0] = out->rgba[pos++];
} else {
row_pointers[i][j+2] = out->rgba[pos++];
row_pointers[i][j+1] = out->rgba[pos++];
row_pointers[i][j+0] = out->rgba[pos++];
}
}
}
//6: 写入rgb数据到Png文件
png_write_image(png_ptr, (png_bytepp)row_pointers);
if (setjmp(png_jmpbuf(png_ptr))) {
printf("error during init_io ...\n");
return -1;
}
//7: 写入尾部信息
png_write_end(png_ptr, NULL);
//8:释放内存 ,销毁png结构体
for (i = 0; i < out->height; i ++)
free(row_pointers[i]);
free(row_pointers);
png_destroy_write_struct(&png_ptr, &info_ptr);
fclose(fp);
return 0;
}
int main(int argc, char **argv)
{
pic_data out;
decode_png("1.png", &out);
write_png_file("2.png", &out);
free(out.rgba);
return 0;
}
#include <stdio.h>
int main(int argc, char *argv[])
{
unsigned short R=0xFF;
unsigned short G=0xFF;
unsigned short B=0xFF;
unsigned short buf = 0;
#if 0
//swap != 0 /*Pixel format: Red: 5 bit, Green: 6 bit, Blue: 5 bit BUT the 2 color bytes are swapped*/
R = (R & 0XF8) << 8;
buf = buf | R;
printf("buf=%#x\n",buf);
G = (G & 0X7E) << 4;
buf = buf | G;
printf("buf=%#x\n",buf);
B = (B & 0X1F);
buf = buf | B;
printf("buf=%#x\n",buf);
#else
//swap /*Pixel format: Red: 5 bit, Green: 6 bit, Blue: 5 bit*/
unsigned short T = 0;
R = (R & 0XF8) << 8;
buf = buf | R;
printf("buf=%#x\n",buf);
G = (G & 0X7E) << 4;
buf = buf | G;
printf("buf=%#x\n",buf);
B = (B & 0X1F);
buf = buf | B;
T = buf >> 8;
buf = (buf << 8) | T;
printf("buf=%#x\n",buf);
#endif
return 0;
}