[英]How to read from binary file to a string/array and an int in c?
在此程序中,我使用一個結構數組寫入一個二進制文件,並且我試圖通過這種方式將其數據放入另一個結構數組中:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
typedef struct rec{
char cim[60];
int x;
}rec; //my structure
int main(){
int i;
FILE *ptr_myfile;
rec ujtomb[25]; //I want to have the elements here after reading the file
rec tomb[25]={{"Spectre",3521},
{"The Hunger Games Mockingjay Part 2",6123},
{"Star Wars The Force awakens",9736},
{"The Thirty Three",2342},
{"The man From UNCLE",4312},
{"Creed",4123},
{"Inside out",6584},
{"The martian",6674},
{"Ant-man",7352},
{"Secret in their eyes",2345},
{"The night before",4758},
{"Love",1586},
{"Legend",8576},
{"Trainwreck",4628},
{"Love the Coopers",6372},
{"Maze runner The scorch trials",8750},
{"No escape",5793},
{"Terminator genisys",8451},
{"Krampus",452},
{"Bridge of spies",9581},
{"By the sea",7582},
{"The peanuts movie",3214},
{"Heist",1346},
{"Spotlight",7450},
{"Jurassic world",5438}}; //I listed the elements of the array
ptr_myfile=fopen("nezettseg.bin","wb");
if (!ptr_myfile)
{
printf("Unable to open file!");
return 1;
}
for (i=0;i<25;i++){ //here i write into nezettseg.bin
fwrite(&tomb[i].cim, sizeof(rec), 1, ptr_myfile);
fwrite(&tomb[i].x, sizeof(rec), 1, ptr_myfile);
}
fclose(ptr_myfile);
FILE* fin = fopen("nezettseg.bin", "rb"); //opening the binary file
for(i=0;i<25;i++){ //now I'm trying to write those movies and numbers into ujtomb
fread(&ujtomb, sizeof(rec), 1, ptr_myfile);
printf("%s %d\n", ujtomb->cim, ujtomb->x);
}
fclose(fin);
return 0;
}
我的代碼有效,但輸出如下所示:
Spectre 3521
\301
0
The Hunger Games Mockingjay Part 2 6123
\353 0
Star Wars The Force awakens 9736
& 0
The Thirty Three 2342
& 0
The man From UNCLE 4312
\330 0
Creed 4123
0
Inside out 6584
\270 0
The martian 6674
0
Ant-man 7352
\270 0
Secret in their eyes 2345
) 0
The night before 4758
\226 0
Love 1586
2 0
Legend 8576
Program ended with exit code: 0
sooo基本上寫了25行,但是\\ number帶有變量'cim',而0-s帶有x。 您能幫我如何將這些標題和數字正確地放入ujtomb嗎?
for (i=0;i<25;i++){
fwrite(&tomb[i].cim, sizeof(rec), 1, ptr_myfile);
fwrite(&tomb[i].x, sizeof(rec), 1, ptr_myfile);
}
是不正確的。 您需要使用:
for (i=0;i<25;i++){
fwrite(&tomb[i], sizeof(rec), 1, ptr_myfile);
}
請記住, tomb[i]
是一個rec
,而不是tomb[i].cim
或tomb[i].x
。
也,
for(i=0;i<25;i++){
fread(&ujtomb, sizeof(rec), 1, ptr_myfile);
printf("%s %d\n", ujtomb->cim, ujtomb->x);
}
是不正確的。 您需要使用:
for(i=0;i<25;i++){
fread(&ujtomb[i], sizeof(rec), 1, fin);
^^^^^ Missing index. ^^^^ Use the right FILE*
printf("%s %d\n", ujtomb[i].cim, ujtomb[i].x);
^^^^ ^^^^ Use the i-th element
}
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