BMP file read/write review-C ++ implementation

It took several hours to read the format of the BMP file and write a small program...

BMP file format written good article: http://www.cnblogs.com/ZXYloveFR/archive/2012/08/06/2625225.html

BMP file format:

typedef struct tagBITMAPFILEHEADER {        WORD    bfType;        DWORD   bfSize;        WORD    bfReserved1;        WORD    bfReserved2;        DWORD   bfOffBits;} BITMAPFILEHEADER, FAR *LPBITMAPFILEHEADER, *PBITMAPFILEHEADER;

 

typedef struct tagBITMAPINFOHEADER{        DWORD      biSize;        LONG       biWidth;        LONG       biHeight;        WORD       biPlanes;        WORD       biBitCount;        DWORD      biCompression;        DWORD      biSizeImage;        LONG       biXPelsPerMeter;        LONG       biYPelsPerMeter;        DWORD      biClrUsed;        DWORD      biClrImportant;} BITMAPINFOHEADER, FAR *LPBITMAPINFOHEADER, *PBITMAPINFOHEADER;

Main Code: (function: Read the file header, information header, and bitmap data from the BMP file .. Write the data to a BMP file defined by us .)

# Include <iostream> # include <windows. h> using namespace STD; void main () {file * stream = fopen ("D: \ 3.bmp", "rb"); If (Stream = NULL) {cout <"file does not exist" <Endl; return;} int sizefileheader = sizeof (bitmapfileheader); int sizeinfoheader = sizeof (bitmapinfoheader); Word filetype; DWORD filesize; DWORD dataoffset; bitmapfileheader * bitmapfileheader = new bitmapfileheader [sizefileheader + 1]; DWORD sizeimage = 0; bitmapinfoheader * bitma Pinfoheader = new bitmapinfoheader [sizeinfoheader + 1]; memset (bitmapfileheader, 0, sizefileheader + 1); memset (bitmapinfoheader, 0, sizeinfoheader + 1); fread (bitmapfileheader, sizeof (char), sizefileheader, stream); fseek (stream, sizefileheader, 0); fread (bitmapinfoheader, sizeof (char), sizeinfoheader, stream ); // ************************************** filetype = bitmapfileheader-> bftype; if (filetype! = 0x4d42) {cout <"This is not a BMP file" <Endl; return;} filesize = bitmapfileheader-> bfsize; dataoffset = bitmapfileheader-> bfoffbits; cout 
You will find that the new file is similar to the original file. The only difference is that there is a black horizontal line in the lower left corner of the new image. This is

for(int i=0;i<221;i++){data[i]=0;}
Cause... The order for storing BMP files is from left to right, from bottom to top. For more information, see the above link .. (Large-end method and small-end method, memory alignment ).
When I encountered a problem, I created an empty project and found that I was prompted by DWORD and word: an undeclared identifier. To solve this problem, you only need to include the header file that defines the data type .. You can also define the data type as follows:
typedef unsigned long       DWORD;
typedef unsigned short      WORD;

This is not the focus, but the reflection on the built-in and non-built-in data types of C ++, so you can see my next article (just an example ). If you know something more comprehensive, you may want to communicate with others ..