How to get the raw data of CR2 image using LibRaw(c++) - c

Question

LibRaw is a library for reading RAW files from digital photo cameras (CRW/CR2, NEF, RAF, DNG, MOS, KDC, DCR, etc.; virtually all RAW formats are supported).
I want to know how to use LibRaw to get the raw data of a Canon CR2 image.
typedef struct
{
ushort (*image)[4] ;
libraw_image_sizes_t sizes;
libraw_iparams_t idata;
libraw_lensinfo_t lens;
libraw_makernotes_t makernotes;
libraw_shootinginfo_t shootinginfo;
libraw_output_params_t params;
unsigned int progress_flags;
unsigned int process_warnings;
libraw_colordata_t color;
libraw_imgother_t other;
libraw_thumbnail_t thumbnail;
libraw_rawdata_t rawdata;
void *parent_class;
} libraw_data_t;
typedef struct
{
void *raw_alloc;
ushort *raw_image;
ushort (*color4_image)[4] ;
ushort (*color3_image)[3];
float *float_image;
float (*float3_image)[3];
float (*float4_image)[4];
short (*ph1_cblack)[2];//
short (*ph1_rblack)[2];//
libraw_iparams_t iparams;//
libraw_image_sizes_t sizes;//
libraw_internal_output_params_t ioparams;//
libraw_colordata_t color;//
} libraw_rawdata_t;
This is the data structure of RAW data, I don't know which structure the most primitive data is stored in.

Answer 1

I have already got the answer, now download it below, I hope to help those in need.
int i,ret,verbose = 0,output_thumbs = 0;
char outfn [1024],thumbfn [1024];
//Create object
LibRaw RawProcessor;
putenv((char *)"TZ = UTC+8");
//
#define P1 RawProcessor.imgdata.idata
#define S RawProcessor.imgdata.sizes
#define C RawProcessor.imgdata.color
#define T RawProcessor.imgdata.thumbnail
#define P2 RawProcessor.imgdata.other
#define OUT RawProcessor.imgdata.params
OUT.output_tiff = 0; //
OUT.no_auto_scale=1;//
OUT.no_auto_bright=1;//
OUT.output_bps=16;//16bit
OUT.output_color=0;//RAW
//openfile
if((ret = RawProcessor.open_file(szFile))!= LIBRAW_SUCCESS)
{
fprintf(stderr,"Can not open%s:%s\n",szFile,libraw_strerror(ret));
RawProcessor.recycle();
return FALSE;
}
//RAW size
int height=S.raw_height;
int width=S.raw_width;
//image info
memset(LinsnData.imgdata.make,0,64*sizeof(char));
memset(LinsnData.imgdata.model,0,64*sizeof(char));
memcpy(LinsnData.imgdata.make,P1.make,strlen(P1.make));
memcpy(LinsnData.imgdata.model,P1.model,strlen(P1.model));
LinsnData.imgdata.aperture=P2.aperture;
LinsnData.imgdata.iso_speed=P2.iso_speed;
LinsnData.imgdata.shutter=P2.shutter;
char timestamp[64]= {0};
tm* local = localtime(&P2.timestamp); //
strftime(LinsnData.imgdata.timestamp, 64, "%Y-%m-%d %H:%M:%S", local);
/***************************************************************************************************/
//
if((ret = RawProcessor.unpack())!= LIBRAW_SUCCESS)
{
fprintf(stderr,"Can not unpack_thumb%s：%s\n",szFile,libraw_strerror(ret));
//if(LIBRAW_FATAL_ERROR(ret))
goto end;
}
WORD *bmpData=RawProcessor.imgdata.rawdata.raw_image;
int nWidth = width/2;
int nHeight = height/2;
WORD *m_bmpDataR = new WORD[nWidth*nHeight];
WORD *m_bmpDataG = new WORD[nWidth*nHeight];
WORD *m_bmpDataB = new WORD[nWidth*nHeight];
//
for(int i=0;i<nHeight;i++)
{
for(int j=0;j<nWidth;j++)
{
m_bmpDataB[i*nWidth+j] = bmpData[i*nWidth*4+nWidth*2+j*2+1];
m_bmpDataG[i*nWidth+j] = ((bmpData[i*nWidth*4+nWidth*2+j*2]+bmpData[i*nWidth*4+j*2+1])>>1);
m_bmpDataR[i*nWidth+j] = bmpData[i*nWidth*4+j*2];
}
}