C + + reads and stores a BMP image

C + + reads and stores a BMP image

Reprint please indicate the source

Previously wrote an article introducing BMP format, this is the basis of C + + processing Digital image, only know the BMP file in the computer storage structure, can talk about after the image processing. Here is the connection address: http://blog.csdn.net/carvin_zh/article/details/45875277

C + + Source:

#include <iostream> #include <Windows.h> #include <malloc.h> #include <stdlib.h> #include <                        Stdio.h> #include <string.h>using namespace std;void main () {char filename[30];                                Define open image name Char *buf; Defines the file read buffer char *p;int R,g,b,pix;                                 HWND Wnd;                                   Window handle HDC DC;                                 Drawing device environment handle file *FP;                                Defines a file pointer to document *FPW;                                Defines the save file pointer DWORD w,h;                      Defines the long and wide DWORD bitcorlorused of the read image;                            Defines the DWORD bitsize;                      Defines the size of the image bitmapfileheader BF;                      Image file Header Bitmapinfoheader bi; Image file header information cout<< "Please enter the name of the file to open:"; Cin>>filename;if ((Fp=fopen (FileName, "RB") ==null) {cout<< "File not found!)   ";    Exit (0);} Fread (&bf,sizeof (Bitmapfileheader), 1,FP);//Read BMP file Header file Fread (&bi,sizeof (Bitmapinfoheader),1,FP);//Read BMP file header file information w=bi.biwidth;                           Obtain the wide h=bi.biheight of the image;                  Get the high bitsize=bi.bisizeimage of the image;                Gets the image of Sizebuf= (char*) malloc (w*h*3);                   Allocate buffer size fseek (fp,long (sizeof (Bitmapfileheader) +sizeof (bitmapinfoheader)), 0);//position to pixel start position fread (BUF,1,W*H*3,FP);               Start reading data Wnd=getforegroundwindow ();                           Gets the window handle DC=GETDC (WND); Get drawing device int x=40;int y=40;p=buf;for (int j=0;j

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C + + reads and stores a BMP image