fread（）不添加空終止符[C]，不能添加一個，因爲我有一個指針指針

Question

37行，我試圖在我的緩衝區指針中打印數據。但我有一個指針（gdhFileProp->緩衝區）到一個指針（char *緩衝區）。由於我使用的是fread（），它在讀取文件內容時不會添加\ 0。由於它是一個指針指針，我不能添加\ 0。

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


// Struct to hold the properties of our file 
typedef struct { 

    int size; 
    char* name; 
    char* buffer; 

} FILEPROP; 

FILEPROP* gdhFileProp; 

// Function to parse file 
int parseFile(char name[]){ 

    // set name 
    gdhFileProp = malloc(sizeof(FILEPROP)); 
    gdhFileProp->name = name; 

    // load file 
    FILE* gdhFilePointer; 
    gdhFilePointer = fopen("test.txt", "rb+"); 

    // get file size 
    fseek(gdhFilePointer, 0, SEEK_END); 
    gdhFileProp->size = ftell(gdhFilePointer); 

    //get data and put it into the buffer 
    fseek(gdhFilePointer, 0, SEEK_SET); 
    fread(&gdhFileProp->buffer, 1, gdhFileProp->size, gdhFilePointer); 
    //Print data 
    printf("File properties:\nSize: %d bytes\nName: %s \nData: %s\n", gdhFileProp->size, gdhFileProp->name, &gdhFileProp->buffer); 

    return 1; 
} 

int main() 
{ 
    char name[] = "test.txt"; 
    parseFile(name); 
    return 0; 
} 

Answer 1

您有未定義的行爲：您根本沒有爲buffer分配空間。你應該這樣做，然後你可以添加一個空終止符，如果你想。或者嘗試使用fwrite(buffer, 1, size_read, stdout);。