生成二维码

用libqrencode库，可以到https://github.com/fukuchi/libqrencode下载自己编译。

使用时参考下面

#include <stdio.h>  #include <Windows.h>  #include <qrencode.h>  //#pragma comment(lib,"libqrencode.lib")  #define BMP_SCALE 8int main(){const char * QRTEXT = "6546546546546515615231548468465351321654564654654564564156456456564654184564654";QRcode * qrCode;int version = 1;//设置版本号，这里设为5，对应尺寸：37 * 37  QRecLevel level = QR_ECLEVEL_L;QRencodeMode hint = QR_MODE_8;int casesensitive = 1;qrCode = QRcode_encodeString(QRTEXT, version, level, hint, casesensitive);if (NULL == qrCode){printf("QRcode create fail\n");return -1;}//将要生成的二维码保存为BMP真彩色图片文件  FILE * pf = fopen("qrcode.bmp", "wb");if (NULL == pf){printf("file open fail.\n");fclose(pf);return -1;}int width = qrCode->width * BMP_SCALE;int height = qrCode->width * BMP_SCALE;int biCount = 24;//真彩色  int lineByte = (width * biCount / 8 + 3) / 4 * 4; //每line字节数必须为4的倍数  //位图文件头  BITMAPFILEHEADER bitMapFileHeader;bitMapFileHeader.bfType = 0x4D42;bitMapFileHeader.bfSize = sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER)+lineByte * height;bitMapFileHeader.bfReserved1 = 0;bitMapFileHeader.bfReserved2 = 0;bitMapFileHeader.bfOffBits = sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER);//位图信息头  BITMAPINFOHEADER bitMapInfoHeader;bitMapInfoHeader.biBitCount = biCount;bitMapInfoHeader.biClrImportant = 0;bitMapInfoHeader.biClrUsed = 0;bitMapInfoHeader.biCompression = 0;bitMapInfoHeader.biHeight = height;bitMapInfoHeader.biPlanes = 1;bitMapInfoHeader.biSize = 40;bitMapInfoHeader.biSizeImage = lineByte * height;bitMapInfoHeader.biWidth = width;bitMapInfoHeader.biXPelsPerMeter = 0;bitMapInfoHeader.biYPelsPerMeter = 0;//写文件头进文件  fwrite(&bitMapFileHeader, sizeof(BITMAPFILEHEADER), 1, pf);//写位图信息头进文件  fwrite(&bitMapInfoHeader, sizeof(BITMAPINFOHEADER), 1, pf);unsigned char * pBMPData = new unsigned char[lineByte * height];memset(pBMPData, 255, lineByte * height);unsigned char * qrData = qrCode->data;for (int i = height; i > 0 ; i--){for (int j = 0; j < lineByte / 3; j++){if (*(qrData + (i / BMP_SCALE * qrCode->width + j / BMP_SCALE)) & 1){//设置rgb颜色，可自定义设置，这里设为黑色。  *(pBMPData + lineByte * (i * 1) + 3 * (j * 1)) = 0;*(pBMPData + lineByte * (i * 1) + 3 * (j * 1) + 1) = 0;*(pBMPData + lineByte * (i * 1) + 3 * (j * 1) + 2) = 0;}//qrData++;}}//写数据进文件  fwrite(pBMPData, sizeof(unsigned char), lineByte * height, pf);fclose(pf);delete[] pBMPData;pBMPData = NULL;QRcode_free(qrCode);return 0;}