libqrencode生成二维码并保存成bmp图片

#include "qrencode.h"#define QT_OUT_FILE     "/root/Application/QRBMP/qrpay.bmp"// Prescaler (number of pixels in bmp file for each QRCode pixel, on each dimension)#define OUT_FILE_PIXEL_PRESCALER    4       // Color of bmp pixels  #define PIXEL_COLOR_R               0xff        #define PIXEL_COLOR_G               0#define PIXEL_COLOR_B               0#define BI_RGB                      0L#pragma pack(push, 2) //2字节对齐，不然会出问题typedef struct{    unsigned short bfType;    unsigned long  bfSize;    unsigned short bfReserved1;    unsigned short bfReserved2;    unsigned long bfOffBits;} BITMAPFILEHEADER;typedef struct{    unsigned long biSize;    signed long biWidth;    signed long biHeight;    unsigned short biPlanes;    unsigned short biBitCount;    unsigned long biCompression;    unsigned long biSizeImage;    signed long biXPelsPerMeter;    signed long biYPelsPerMeter;    unsigned long biClrUsed;    unsigned long biClrImportant;} BITMAPINFOHEADER;#pragma pack(pop)int Save_QEImage(char* szSourceSring){    unsigned int unWidth, x, y, l, n, unWidthAdjusted, unDataBytes;    unsigned char* pRGBData, *pSourceData, *pDestData;    QRcode* pQRC;    FILE* f;    // Compute QRCode    if  (pQRC = QRcode_encodeString(szSourceSring, 0, QR_ECLEVEL_H, QR_MODE_8, 1))    {        //矩阵的维数        unWidth = pQRC->width;        unWidthAdjusted = unWidth * OUT_FILE_PIXEL_PRESCALER * 3;        //每一个维度占的像素的个数（8），每个像素3个字节        if (unWidthAdjusted % 4)        {            unWidthAdjusted = (unWidthAdjusted / 4 + 1) * 4;        }        unDataBytes = unWidthAdjusted * unWidth * OUT_FILE_PIXEL_PRESCALER;        // Allocate pixels buffer        if (!(pRGBData = (unsigned char*)malloc(unDataBytes)))        {            printf("Out of memory");            return 1;        }        // Preset to white        memset(pRGBData, 0xff, unDataBytes);        // Prepare bmp headers        BITMAPFILEHEADER kFileHeader;        kFileHeader.bfType = 0x4d42;  // "BM"        kFileHeader.bfSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + unDataBytes;        kFileHeader.bfReserved1 = 0;        kFileHeader.bfReserved2 = 0;        kFileHeader.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);        BITMAPINFOHEADER kInfoHeader;        kInfoHeader.biSize = sizeof(BITMAPINFOHEADER);        kInfoHeader.biWidth = unWidth * OUT_FILE_PIXEL_PRESCALER;        kInfoHeader.biHeight = -((int)unWidth * OUT_FILE_PIXEL_PRESCALER);        kInfoHeader.biPlanes = 1;        kInfoHeader.biBitCount = 24;        kInfoHeader.biCompression = BI_RGB;        kInfoHeader.biSizeImage = 0;        kInfoHeader.biXPelsPerMeter = 0;        kInfoHeader.biYPelsPerMeter = 0;        kInfoHeader.biClrUsed = 0;        kInfoHeader.biClrImportant = 0;        // Convert QrCode bits to bmp pixels        pSourceData = pQRC->data;        for (y = 0; y < unWidth; y++)        {            pDestData = pRGBData + unWidthAdjusted * y * OUT_FILE_PIXEL_PRESCALER;            for (x = 0; x < unWidth; x++)            {                if (*pSourceData & 1)                {                    for (l = 0; l < OUT_FILE_PIXEL_PRESCALER; l++)                    {                        for (n = 0; n < OUT_FILE_PIXEL_PRESCALER; n++)                        {                            *(pDestData + n * 3 + unWidthAdjusted * l) = PIXEL_COLOR_B;                            *(pDestData + 1 + n * 3 + unWidthAdjusted * l) = PIXEL_COLOR_G;                            *(pDestData + 2 + n * 3 + unWidthAdjusted * l) = PIXEL_COLOR_R;                        }                    }                }                pDestData += 3 * OUT_FILE_PIXEL_PRESCALER;                pSourceData++;            }        }        // Output the bmp file        //f = fopen(QT_OUT_FILE,"wb");        f = fopen(QT_OUT_FILE,"ab++");        if (f != NULL)        {            fwrite(&kFileHeader, sizeof(BITMAPFILEHEADER), 1, f);            fwrite(&kInfoHeader, sizeof(BITMAPINFOHEADER), 1, f);            fwrite(pRGBData, sizeof(unsigned char), unDataBytes, f);            fclose(f);        }        else        {            printf("Unable to open file\n");            return 1;        }        // Free data        free(pRGBData);        QRcode_free(pQRC);    }    else    {        printf("NULL returned");        return 1;    }    return 0;}