MFC:将整个文件读取到缓冲区

MFC:将整个文件读取到缓冲区,mfc,file-io,Mfc,File Io,我处理了一些代码,但无法正确读取整个文件…输出中附加了很多垃圾。我该如何解决这个问题 // wmfParser.cpp : Defines the entry point for the console application. // #include "stdafx.h" #include "wmfParser.h" #include <cstring> #ifdef _DEBUG #define new DEBUG_NEW #endif // The one and on

我处理了一些代码,但无法正确读取整个文件…输出中附加了很多垃圾。我该如何解决这个问题

// wmfParser.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "wmfParser.h"
#include <cstring>

#ifdef _DEBUG
#define new DEBUG_NEW
#endif


// The one and only application object

CWinApp theApp;

using namespace std;

int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
{
    int nRetCode = 0;

    // initialize MFC and print and error on failure
    if (!AfxWinInit(::GetModuleHandle(NULL), NULL, ::GetCommandLine(), 0))
    {
        // TODO: change error code to suit your needs
        _tprintf(_T("Fatal Error: MFC initialization failed\n"));
        nRetCode = 1;
    }
    else
    {
        // TODO: code your application's behavior here.
        CFile file;
        CFileException exp;
        if( !file.Open( _T("c:\\sample.txt"), CFile::modeRead, &exp ) ){            
            exp.ReportError();
            cout<<'\n';         
            cout<<"Aborting...";
            system("pause");
            return 0;
        }

        ULONGLONG dwLength = file.GetLength();
        cout<<"Length of file to read = " << dwLength << '\n';
        /*
        BYTE* buffer;
        buffer=(BYTE*)calloc(dwLength, sizeof(BYTE));
        file.Read(buffer, 25);
        char* str = (char*)buffer;      
        cout<<"length of string : " << strlen(str) << '\n';     
        cout<<"string from file: " << str << '\n';
        */

        char str[100];

        file.Read(str, sizeof(str));
        cout << "Data : " << str <<'\n';
        file.Close();
        cout<<"File was closed\n";

        //AfxMessageBox(_T("This is a test message box"));
        system("pause");
    }
    return nRetCode;
}
//wmfParser.cpp:定义控制台应用程序的入口点。
//
#包括“stdafx.h”
#包括“wmfParser.h”
#包括
#ifdef_调试
#定义新调试\u新
#恩迪夫
//唯一的应用程序对象
CWinApp-theApp;
使用名称空间std;
int_tmain(int-argc,TCHAR*argv[],TCHAR*envp[]
{
int nRetCode=0;
//初始化MFC并打印,失败时出错
如果(!AfxWinInit(::GetModuleHandle(NULL),NULL,::GetCommandLine(),0))
{
//TODO:更改错误代码以满足您的需要
_tprintf(_T(“致命错误:MFC初始化失败”);
nRetCode=1;
}
其他的
{
//TODO:在此处编写应用程序的行为代码。
文件文件;
cfileexp;
如果(!file.Open(_T(“c:\\sample.txt”),CFile::modeRead,&exp)){
exp.ReportError();

cout您的字符串不是以NULL结尾的。您需要使用
memset(str,0,sizeof(str))初始化字符串
str

我认为这可能更接近您要查找的内容:

    /* first method */

    ULONGLONG dwLength = file.GetLength();
    cout << "Length of file to read = " << dwLength << '\n';

    // make room for whole file, plus null
    BYTE *buffer = (BYTE *) malloc(dwLength + 1); 

    file.Read(buffer, dwLength); // read whole file
    *(buffer + dwLength) = '\0';   // add null

    cout << "length of string : " << strlen(buffer) << '\n';     
    cout << "string from file: " << buffer << '\n';

    free(buffer);

    file.SeekToBegin(); // Back to the beginning

    /* second method */
    char str[dwLength + 1];

    file.Read(str, dwLength + 1);
    str[dwLength] = '\0';

    cout << "Data : " << str <<'\n';
    file.Close();

    cout << "File was closed\n";
/*第一种方法*/
ULONGLONG dwLength=file.GetLength();
库特