Re: Error in RtlZeroMemory - C / C++ / MFC Discussion Boards

jkirkerx4-Dec-11 9:14

4-Dec-11 9:14

I have my getline working, and I have just been schooled in file formats, such as UTF8, UTF16LE and UTF16BE. I also learned about the BOM, to figure out what kind of file I have, in case the customer modifies the original.

So I can use my wifstream to open a UTF8 SQL Text file, and read it correctly, with no 16 bit gaps. I originally used ifstream and wifstream to read a Unicode UC2 file, and got the every other character sequence, So I exported the file as UTF8, and tried again.

The getline puzzles me, and it has something to do with \n.

sqlDBFile->getline(szCommandLine, 1024);

First line reads ok
i>>?--SQL Comment --
second line is missing the first char.
REATE instead of CREATE

Here's my theory
0x000d 0x000A is end/begin mark, and getline is terminating beyond the \n.

I really need that first character, so I can detect the word GO, instead of getting O.

Re: wifstream with getline - OD OA issue

jkirkerx4-Dec-11 13:19

jkirkerx

4-Dec-11 13:19

Well I got it finally, documentation is poor, but it was there.

getline - gets the line, and keeps the /n
gets - get the line, and discards the /n

I used a do loop with a while (sqlDBFile->get()) at the end, so it was chopping off the first char of the next line.

So this is what I ended up with, but I'm not sure if I need the conv at the top

typedef std::codecvt<wchar_t, wchar_t, mbstate_t> nullcodecvt;
const nullcodecvt &conv =
std::use_facet<nullcodecvt>(std::wcin.getloc());
const std::locale from(std::wcin.getloc(), &conv);

std::wifstream *sqlDBFile = new std::wifstream;
sqlDBFile->open( szFilePath, std::ios_base::in );

// if the file stream opened
if (sqlDBFile->is_open() ) {

    if (_wcsicmp(szEncoding, L"UTF8") == 0 ) {
        sqlDBFile->seekg(3, std::ios::beg);
    }

    // Make a temp sql command buffer
    WCHAR *pzSQLCommand = new WCHAR[8192];
    wcsncpy_s(pzSQLCommand, 8192, L"-- SQL Command Buffer --\n", wcslen(L"-- SQL Command Buffer --\n") );

    // While file stream is in memory
    while (sqlDBFile->good() ) {
        while (!sqlDBFile->eof() ) {
            WCHAR szCommandLine[1024];
            for (int i = 0; i<1024; ++i) {
                szCommandLine[i] = 0xcccc;
            }

            sqlDBFile->getline(szCommandLine, 1024);

            // Check for Comment Line
            if (szCommandLine[0] == 0x002d)
                    continue;
            // Check for Unknown Line - Can't Remember this one
            if ((szCommandLine[0] == 0x0000) && (szCommandLine[1] == 0x0000))
                continue;
            // Check for Blank Line
            if ((szCommandLine[0] == 0x0000) && (szCommandLine[1] == 0xcccc))
                continue;

            if (_wcsicmp(szCommandLine, L"GO") == 0 ) {
                // if text = GO, terminate the buffer and execute the buffered command
                hr = pICommandText->SetCommandText( DBGUID_DBSQL, pzSQLCommand );
                hr = pICommandText->QueryInterface( IID_ICommandProperties, ( void ** ) &pICommandProperties );
                hr = pICommandText->Execute( NULL, IID_IRowset, NULL, &cRowsAffected, ( IUnknown ** ) &pIRowset );

                // Clear the main command buffer for next use
                for (int i = 0; i<8192; ++i) {
                    pzSQLCommand[i] = 0xcccc;
                }
            }
            else {
                // if text != GO, cat to main command buffer
                szCommandLine[wcslen(szCommandLine)] = L'\0';
                wcsncat_s(pzSQLCommand, 8196, szCommandLine, wcslen(szCommandLine) );
                continue;
            }
        }
    }

    delete pzSQLCommand;

    // close the sql command file
    sqlDBFile->close();
    sqlDBFile = NULL;
}

Error in RtlZeroMemory [SOLVED]

vishalgpt3-Dec-11 16:59

vishalgpt

3-Dec-11 16:59

RTL_QUERY_REGISTRY_TABLE query_table[2];

RtlZeroMemory(&query_table[0],sizeof(query_table));

RtlZeroMemory gives error
//Error: expression must have (pointer-to-)function type

please guide..

Answer:

Firstly sorry for late reply,

It was really a very strange error, or one can call it a bug.

I just uninstalled the visual studio express ide and re-installed it. After that RtlZeroMemory error had gone. I guess some exception or bug had occured in the ide or compiler or god knows. But it worked.

Thank you all, for sharing your precious time with me.

Regards,
Vishal