從C中的多個文件讀取內容

Question

例：

三個檔案

hi.txt

在txt中： “願我們成為”

again.txt

txt里面： “曾經的那些人”

final.txt

在txt中： “知道C”

然后，另一個名為“ order”的文件

order.txt

在txt中：

“ hi.txt; 6 ”

“ again.txt; 7 ”

“ final.txt; 3 ”

我想要的是：讀取第一個文件名，打開它，列出內容，等待6秒鍾，讀取第二個名稱，打開它，列出內容，等待7秒鍾，讀取第三個名稱，打開，列出內容，等待3秒

如果我在不打開內容的情況下這樣做（您會在代碼上看到一會兒）並列出名稱，則它可以工作，但是由於某種原因，在涉及內容時卻沒有。

orderFile = fopen("order.txt","r");

    while(fscanf(orderFile,"%49[^;];%d",fileName,&seconds) == 2)
    {
        contentFile = fopen(fileName,"r");

        while(fscanf(contentFile,"%[^\t]",textContent) == 1)
        {
            printf("%s\n", textContent);
        }

        sleep(seconds);

        fclose(contentFile);
    }

fclose(orderFile);

輸出：

可以吧

（等待7秒）

程序以“ RUN SUCCESSFUL”關閉

編輯@

就像你們說的那樣，現在可以正常工作，這就是問題所在：

舊：

while(fscanf(orderFile,"%49[^;];%d",fileName,&seconds) == 2)

新：

while(fscanf(orderFile," %49[^;];%d",fileName,&seconds) == 2)

我有一個“艱難”的時間來完全理解它，這個空間是做什么的？ 不接受進入？ 空格？ 到底是什么

Answer 1

不要為此使用fscanf

int
main()
{
    FILE *orderFile = fopen("order.txt", "r");
    if (orderFile != NULL)
    {
        int  seconds;
        char line[128];

        /* 
         * fgets, read sizeof line characters or unitl '\n' is encountered
         * this will read one line if it has less than sizeof line characters
         */
        while (fgets(line, sizeof line, orderFile) != NULL)
        {
            /* 
             * size_t is usually unsigned long int, and is a type used 
             * by some standard functions.
             */
            size_t fileSize;
            char  *fileContent;
            FILE  *contentFile;     
            char   fileName[50];
            /* parse the readline with scanf, extract fileName and seconds */
            if (sscanf(line, "%49[^;];%d", fileName, &seconds) != 2)
                continue;
            /* try opening the file */
            contentFile = fopen(fileName,"r");
            if (contentFile == NULL)
                continue;
            /* seek to the end of the file */
            fseek(contentFile, 0, SEEK_END);
            /* 
             * get current position in the stream, 
             * it's the file size, since we are at the end of it 
             */
            fileSize = ftell(contentFile);
            /* seek back to the begining of the stream */
            rewind(contentFile);
            /* 
             * request space in memory to store the file's content
             * if the file turns out to be too large, this call will
             * fail, and you will need a different approach.
             * 
             * Like reading smaller portions of the file in a loop.
             */
            fileContent = malloc(1 + fileSize);
            /* check if the system gave us space */
            if (fileContent != NULL)
            {
                size_t readSize;
                /* read the whole content from the file */
                readSize = fread(fileContent, 1, fileSize, contentFile);
                /* add a null terminator to the string */
                fileContent[readSize] = '\0';
                /* show the contents */
                printf("%s\n", fileContent);
                /* release the memory back to the system */
                free(fileContent);
            }
            sleep(seconds);
            fclose(contentFile);
        }
        fclose(orderFile);  
    }

    return 0;
}

代碼中幾乎沒有解釋所有內容，如果需要更多信息，請閱讀手冊。