[C/C++語言] file_put_contents() 與 file_get_contents()

Base C library :

原始碼

1. #include <stdio.h> 
2. #include <malloc.h> 
3.  
4. char* file_get_contents(char* filename){ 
5. char *content; 
6. long length; 
7. FILE *fp = fopen(filename, "r"); 
8. if(fp == NULL){ return NULL;} 
9.  
10. fseek(fp, 0, SEEK_END); 
11. length = ftell(fp); 
12.  
13. content = (char*)malloc(length + 1); 
14.  
15. fseek(fp, 0, SEEK_SET); 
16. length=0; 
17. while((content[length]=getc(fp)) != EOF) { length++; } 
18. content[length] = '\0'; 
19. return content; 
20. } 
21.  
22. long file_put_contents(char* filename, char* content){ 
23. FILE * fp; int length; 
24. if((fp = fopen(filename, "w")) == NULL){ return -1; } 
25.  
26. fputs(content, fp); 
27. fclose(fp); 
28. return length; 
29. } 
30.  
31.  
32. int main(){ 
33. file_put_contents("temp.txt","hello,world! for C \n"); 
34. char * contents = file_get_contents("temp.txt"); 
35. printf("%s",contents); 
36.  
37. return 0; 
38. } 

#include <stdio.h>
#include <malloc.h>

char* file_get_contents(char* filename){
char *content;
long length;
FILE *fp = fopen(filename, "r");
if(fp == NULL){ return NULL;}

fseek(fp, 0, SEEK_END);
length = ftell(fp);

content = (char*)malloc(length + 1);

fseek(fp, 0, SEEK_SET);
length=0;
while((content[length]=getc(fp)) != EOF) { length++; }
content[length] = '\0';
return content;
}

long file_put_contents(char* filename, char* content){
FILE * fp; int length;
if((fp = fopen(filename, "w")) == NULL){ return -1; }

fputs(content, fp);
fclose(fp);
return length;
}


int main(){
file_put_contents("temp.txt","hello,world! for C \n");
char * contents = file_get_contents("temp.txt");
printf("%s",contents);

return 0;
}

Base C++ library :

原始碼

1. #include <fstream> 
2. #include <string> 
3.  
4. #include <iostream> 
5. using namespace std; 
6.  
7.  
8. string file_get_contents(char* fileName) { 
9. ifstream file(fileName); 
10. if (!file) { return ""; } 
11.  
12. string content = "", line; 
13. while (!file.eof()){ 
14. getline(file,line); 
15. content += line+"\n"; 
16. } 
17. file.close(); 
18. return content; 
19. } 
20.  
21. void file_put_contents(char * fileName, char * content) { 
22. ofstream file; 
23. file.open(fileName); 
24. file << content; 
25. file.close(); 
26. } 
27.  
28.  
29. int main() { 
30. file_put_contents("temp.txt", "hello,world! for C++ \n"); 
31. cout << file_get_contents("temp.txt"); 
32.  
33. return 0; 
34. } 

#include <fstream>
#include <string>

#include <iostream>
using namespace std;


string file_get_contents(char* fileName) {
ifstream file(fileName);
if (!file) { return ""; }

string content = "", line;
while (!file.eof()){
getline(file,line);
content += line+"\n";
}
file.close();
return content;
}

void file_put_contents(char * fileName, char * content) {
ofstream file;
file.open(fileName);
file << content;
file.close();
}


int main() {
file_put_contents("temp.txt", "hello,world! for C++ \n");
cout << file_get_contents("temp.txt");

return 0;
}

參考來源：
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[C++]Otwarcie pliku