#include
using namespace std
#define Twoto1(i,j,w) i*w+j
void createimage(unsigned char *&img, int w, int h)
{img = new unsigned char[w*h]}
void delateimage(unsigned char*img)
{delete []img}
void readimage(unsigned char*img, int w, int h, char *fname)
{
FILE *fp
fopen_s(&fp,fname, "rb")
if (fp == NULL){ cout <<"error" <<endlreturn}
size_t result
result=fread(img , sizeof(unsigned char), w*h, fp)
if (result != w*h)
{
cout <<"Reading error" <<endl
return
}
else
cout <<"Reading Ok!" <<endl
fclose(fp)
}
void mobanjuanji(unsigned char image, unsigned char*image1, int w, int h, float moban[5][5])
{
for (int i = 0i for (int j = 0j if (iw - 3 || j>h - 3)
image1[Twoto1(i,j,w)] = 0
else
{
float temp = 0
for (int m = 0m<5m++)
for (int n = 0n<5n++)
{
temp += (image[Twoto1(i-2+m,j-2+n,w)] moban[m][n])
}
if (temp>255) image1[Twoto1(i, j, w)] = 255
else if (temp<0) image1[Twoto1(i, j, w)] = 0
else image1[Twoto1(i, j, w)] = temp
}
}
void saveimage(unsigned char *img, int w, int h, char *fname)
{
FILE *fp
fopen_s(&fp, fname, "wb")
if (fp == NULL) { cout <<"error" <<endlreturn}
size_t result
result = fwrite(img, sizeof(unsigned char), w*h, fp)
if (result != w*h)
{
cout <<"Write error" <<endl
return
}
else
cout <<"Write Ok!" <<endl
fclose(fp)
}
void main()
{
unsigned char *img
unsigned char *img1
float moban[5][5] = { {0,0,0,0,0},{0, -1, 0, 1, 0 }, { 0, -2, 0, 2, 0 }, { 0, -1, 0, 1, 0 }, { 0,0,0,0,0 } }
//float moban[5][5] = { 0 }
int w = 512, h = 512
createimage(img, w, h)
createimage(img1, w, h)
readimage(img, w, h, "E:\ss.raw")
mobanjuanji(img, img1,w, h, moban)
saveimage(img, w, h, "E:\ss_1.raw")
saveimage(img1, w, h, "E:\ss_2.raw")
delateimage(img)
delateimage(img1)
}
扩展资料
C语言实现一个图片的读出和写入
#include <stdlib.h>
#include <windows.h>
int file_size(char* filename)//获取文件名为filename的文件大小。
{
FILE *fp = fopen(filename, "rb")//打开文件。
int size
if(fp == NULL) // 打开文件失败
return -1
fseek(fp, 0, SEEK_END)//定位文件指针到文件尾。
size=ftell(fp)//获取文件指针偏移量，即文件大小。
fclose(fp)//关闭文件。
return size
}
int main ()
{
int size=0
size=file_size("qw")
printf("%d\n",size)
FILE * pFile,*qw
char *buffer=(char*)malloc(sizeof(char)*size)
qw =fopen("qw","r")
pFile = fopen ( "qwe" , "wb" )
printf("%d==\n",pFile)
printf("%d\n",size)
fread(buffer,1,size,qw)
fwrite (buffer , sizeof(byte), size , pFile )
fclose (pFile)
rename("qwe","Groot.jpg")
return 0
}
#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
int file_size(char* filename)//获取文件名为filename的文件大小。
{
FILE *fp = fopen(filename, "rb")//打开文件。
int size
if(fp == NULL) // 打开文件失败
return -1
fseek(fp, 0, SEEK_END)//定位文件指针到文件尾。
size=ftell(fp)//获取文件指针偏移量，即文件大小。
fclose(fp)//关闭文件。
return size
}
int main ()
{
int size=0
size=file_size("qw")
printf("%d\n",size)
FILE * pFile,*qw
char *buffer=(char*)malloc(sizeof(char)*size)
qw =fopen("qw","r")
pFile = fopen ( "qwe" , "wb" )
printf("%d==\n",pFile)
printf("%d\n",size)
fread(buffer,1,size,qw)
fwrite (buffer , sizeof(byte), size , pFile )
fclose (pFile)
rename("qwe","Groot.jpg")
return 0
}
扩展资料：
c语言读取TXT文件：
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAX_LINE 1024
int main()
{
char buf[MAX_LINE] /*缓冲区*/
FILE *fp /*文件指针*/
int len /*行字符个数*/
if((fp = fopen("test.txt","r")) == NULL)
{
perror("fail to read")
exit (1)
}
while(fgets(buf,MAX_LINE,fp) != NULL)
{
len = strlen(buf)
buf[len-1] = '\0' /*去掉换行符*/
printf("%s %d \n",buf,len - 1)
}
return 0
}
