Question

我试图阅读文件内容，但尽管它能够写入同一个文件。我无法从中读取！该程序作为Adminstator运行。

我试图给＃34; FILE_SHARE_WRITE | FILE_SHARE_READ＆＃34;权利，但仍然不起作用。

DWORD   dwBytesWritten = 0;
unsigned long BytesRead = 0;
HANDLE hFile = INVALID_HANDLE_VALUE;
wchar_t text_file[MAX_PATH] = { 0 };


TCHAR *save_text(void) {
    OPENFILENAME    ofn = { 0 };
    TCHAR filename[512] = _T("C://Windows/EXAMPLE.txt");

    ofn.lStructSize = sizeof(ofn);
    ofn.lpstrFilter = L"Txt files (*.txt)\0*.txt\0All Files\0*.*\0";
    ofn.lpstrFile = filename;
    ofn.nMaxFile = sizeof(filename);
    ofn.Flags = OFN_NONETWORKBUTTON | OFN_OVERWRITEPROMPT | OFN_PATHMUSTEXIST | OFN_LONGNAMES | OFN_EXPLORER | OFN_HIDEREADONLY;
    ofn.nFilterIndex = 1;


    return(filename);
}




void WriteToFile(TCHAR *wText)
{

    wchar_t loginchar[1000];

    hFile = CreateFile(text_file, FILE_APPEND_DATA, FILE_SHARE_READ, NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_HIDDEN, NULL);

    WriteFile(hFile, wText, wcslen(wText) * sizeof(wchar_t), &dwBytesWritten, NULL); // its writing without problem
    ReadFile(hFile, loginchar, wcslen(loginchar) * sizeof(wchar_t), &BytesRead, NULL); // accses denied

    ResultInFile(GetLastError()); // ResultInFile funcitons writes paramater to the file 
    //ResultInFile(BytesRead); // to see how many bytes read, but of course doesnt work..
    CloseHandle(hFile);
}

// this is the how file created at main function : 
hFile = CreateFile(txt_file, FILE_APPEND_DATA, FILE_SHARE_READ, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_HIDDEN, NULL);

Answer 1

尝试：

 hFile = CreateFile(text_file, FILE_APPEND_DATA | FILE_READ_DATA, FILE_SHARE_READ, NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_HIDDEN, NULL);

而不是：

 hFile = CreateFile(text_file, FILE_APPEND_DATA, FILE_SHARE_READ, NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_HIDDEN, NULL);

请注意，FILE_SHARE_READ允许其他CreateFile调用请求读取权限，它不会影响文件句柄的读取权限。

C ++ CreateFile无法读取文件ERROR_ACCESS_DENIED

1 个答案: