c語言讀取文本&圖片轉爲二進制流

讀取文本

#include <stdio.h>c
#include <stdlib.h>

// c/c++中文會亂碼
int main(void)
{
    FILE* fp = fopen("C:\\Users\\Administrator\\Documents\\GitHub\\smart\\c_hik_ren\\read_me.txt", "r");
    if(!fp) {
        perror("File opening failed");
        return EXIT_FAILURE;
    }

    int c; // 注意：int，非char，要求處理EOF
    while ((c = fgetc(fp)) != EOF) { // 標準C I/O讀取文件循環
        putchar(c);
    }

    if (ferror(fp))
        puts("I/O error when reading");
    else if (feof(fp))
        puts("End of file reached successfully");

    fclose(fp);
}

圖片轉爲二進制流並寫入txt

#include <stdio.h>
#include <stdlib.h>


int main(void)
{
    FILE *fp;

    // //以二進制方式打開圖像
    fopen_s(&fp,"C:\\Users\\Administrator\\Pictures\\test.jpg", "rb");
    if(fp == NULL) {
        perror("File opening failed");
        return EXIT_FAILURE;
    }

    fseek(fp, 0, SEEK_END);
    long int size = ftell(fp);
    rewind(fp);
    printf("get the size is: %ld\n", size);

    //根據圖像數據長度分配內存buffer
    char* ImgBuffer=(char*)malloc( size* sizeof(char) );
    //將圖像數據讀入buffer
    fread(ImgBuffer, size, 1, fp);
    fclose(fp);


    //以二進制寫入方式
    if ( (fp=fopen("C:\\Users\\Administrator\\Pictures\\a.txt", "wb"))==NULL)
    {
        perror("txtxFile opening failed");
        exit(0);
    }

    //從buffer中寫數據到fp指向的文件中
    fwrite(ImgBuffer, size, 1, fp);
    printf("ok");

    fclose(fp);
    free(ImgBuffer);


}

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>

#define IMAGE_PATH "../"
#define SAVE_IMG  ".jpeg"
#define SAVE_TXT  ".txt"

char* genRandomString(int length)
{
    int flag, i;
    char* string;
    srand((unsigned) time(NULL ));
    if ((string = (char*) malloc(length)) == NULL )
    {
        printf("Malloc failed!flag:14\n");
        return NULL ;
    }

    for (i = 0; i < length - 1; i++)
    {
        flag = rand() % 3;
        switch (flag)
        {
            case 0:
                string[i] = 'A' + rand() % 26;
                break;
            case 1:
                string[i] = 'a' + rand() % 26;
                break;
            case 2:
                string[i] = '0' + rand() % 10;
                break;
            default:
                string[i] = 'x';
                break;
        }
    }


    string[length - 1] = '\0';
    return string;
}

void saveImg(char * pre, char* ImgBuffer, int size, char *save_format){
    // 生成名字
    char buff[1024]=IMAGE_PATH; //第一個字符串
    char *s=genRandomString(10);  //第二個字符串
    strcat(buff, pre);
    strcat(buff,s);    //拼接專兩個字符串，結果保存在第屬一個字符串當中
    strcat(buff,save_format);

    //以二進制寫入方式
    FILE *fp;
    if ( (fp=fopen(buff, "wb+"))==NULL)
    {
        perror("image fopen fall");
        exit(0);
    }

    //從buffer中寫數據到fp指向的文件中
    fwrite(ImgBuffer, size, 1, fp);
    fclose(fp);
}



int main(void)
{

    FILE *fp;

    // //以二進制方式打開圖像
    fopen_s(&fp,"C:\\Users\\Administrator\\Pictures\\qtblog1.png", "rb");
    if(fp == NULL) {
        perror("File opening failed");
        return EXIT_FAILURE;
    }

    fseek(fp, 0, SEEK_END);
    long int size = ftell(fp);
    rewind(fp);
    printf("get the size is: %ld\n", size);

    //根據圖像數據長度分配內存buffer
    char* ImgBuffer=(char*)malloc( size* sizeof(char) );
    //將圖像數據讀入buffer
    fread(ImgBuffer, size, 1, fp);
    fclose(fp);


    saveImg("ren", ImgBuffer, size, SAVE_IMG);
    free(ImgBuffer);
}

int main() {

    FILE *fp;

    // //以二進制方式打開圖像
    fopen_s(&fp,"C:\\Users\\Administrator\\Pictures\\test.jpg", "rb");
    if(fp == NULL) {
        perror("File opening failed");
        return EXIT_FAILURE;
    }

    char pBuffer[8];
    FILE * wp = fopen("C:\\Users\\Administrator\\Pictures\\2.jpg", "wb");
    while (!feof(fp)){
        fread(pBuffer, 1, 3, fp); //f2 = fopen("2.jpg", "wb");
        fwrite(pBuffer, 1, 3, wp); // 每次讀n個字節屬
    }


    fclose(fp);
    fclose(wp);

    printf("Hello, World!\n");
    return 0;
}