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C編程。 嘗試讀寫時程序崩潰

[英]C Programming. Program crashing when trying to read and write

我現在很難解決這個問題...在我復制文件的功能之一中,嘗試從一個文件讀取到另一個文件時,它總是崩潰。 另外,我還是個初學者,對於我犯的任何錯誤,我們深表歉意。

int file_copy(void)
{
    char path_new[MAX_PATH];

    file_load();

    printf("New name: ");
    scanf("%s", path_new);               // <---- Crash right after entering a new path

    FILE *fr_source, *fw_target;

    if (((fr_source = fopen(path_current, "r")) && (fw_target = fopen(path_new, "w"))) == NULL) {
        printf("Error while opening one of these files");
        exit(6);
    }

    int c;

    while((c = getc(fr_source)) != EOF) {
        fputc(c, fw_target);
    }

    printf("File copied successfully.\n");

    if ((fclose(path_current)) && (fclose(path_new)) == EOF) {
        printf("Error while closing one of these files");
        exit(7);
    }

    return 0;
}

int file_load(void)
{
   printf("Path to current file: ");
   scanf("%s", path_current);

   if (file_access(path_current) != 0)
       exit(2);

   return 0;
}

int file_access(char path[])
{
    if ((access(path, F_OK)) != 0) {
       printf("ERROR = %s.\n", strerror(errno));
        exit(1);
    }
    return 0;
}

編輯:現在,將這兩個分開后,它可以工作:

if ((fr_source = fopen(path_current, "r")) == NULL) {
    printf("Error while opening one of these files");
    exit(6);
}

if ((fw_target = fopen(path_new, "w")) == NULL) {
    printf("Error while opening '%s'\n", path_new);
    exit(6);
}

嘗試換線

if (((fr_source = fopen(path_current, "r")) && (fw_target = fopen(path_new, "w"))) == NULL) {

if (((fr_source = fopen(path_current, "r")) == NULL) || ((fw_target = fopen(path_new, "w")) == NULL)) {

同樣的,

if ((fclose(path_current)) && (fclose(path_new)) == EOF) {

應該

if ((fclose(fr_source) == EOF) || (fclose(fw_target) == EOF)) {

使用格式(ptr1 && ptr2) == NULL會造成混淆,並且會在許多編譯器上引發警告(當然,如果您使用gcc -Wall -pedantic ,我會這樣做)。

另外, int fclose(FILE*) ,將打開文件指針而不是字符串作為參數。

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