Transfers image through TCP

• Download ImageTransfers.zip - 161.4 KB

Introduction

The original article proposed to demonstrate elementary network programming by designing a very simple TCP client/server and a simple image viewer. The client select an image file it will send to the server. The server will save and show the image file.

The Client Mainly Code

SOCKET_STREAM_FILE_INFO     StreamFileInfo;
WIN32_FIND_DATA             FindFileData;
FindClose( FindFirstFile( strFileName, &FindFileData ) );
memset( &StreamFileInfo, 0, sizeof(SOCKET_STREAM_FILE_INFO) );
strcpy( StreamFileInfo.szFileTitle, myFile.GetFileTitle() );
StreamFileInfo.dwFileAttributes     =       FindFileData.dwFileAttributes;
StreamFileInfo.ftCreationTime       =       FindFileData.ftCreationTime;
StreamFileInfo.ftLastAccessTime     =       FindFileData.ftLastAccessTime;
StreamFileInfo.ftLastWriteTime      =       FindFileData.ftLastWriteTime;
StreamFileInfo.nFileSizeHigh        =       FindFileData.nFileSizeHigh;
StreamFileInfo.nFileSizeLow         =       FindFileData.nFileSizeLow;
GetDlgItem( IDC_IPADDRESS1 )->GetWindowText( strIpAddress );
//////////////////////////////////////////////////////////////////////////
SOCKET server;
WSADATA wsaData;
int wsaret = WSAStartup( MAKEWORD(2,2), &wsaData );
if( wsaret != 0 )
{
    return;
}
sockaddr_in local;
local.sin_family = AF_INET; //Address family
local.sin_addr.s_addr = inet_addr( strIpAddress ); //Wild card IP address
local.sin_port = htons((u_short)8888); //port to use
server = socket( AF_INET, SOCK_STREAM, 0 );
if( server == INVALID_SOCKET )
{
    return;
}
connect( server,(struct sockaddr *)&local, sizeof(local));
send( server, (char *)&StreamFileInfo,sizeof(SOCKET_STREAM_FILE_INFO), 0 );
Sleep( 10 );
UINT dwRead=0;
char temp[1024];
while( dwRead < StreamFileInfo.nFileSizeLow )
{
   memset( temp, 0, 1024 );
   UINT dw = myFile.Read( temp, 1024 );
   send( server, temp, dw, 0 );
   dwRead += dw;
   Sleep( 10 );
}
myFile.Close();
closesocket(server);
WSACleanup();

The Server Mainly Code

SOCKET server;
WSADATA wsaData;
int wsaret = WSAStartup( MAKEWORD(2,2), &wsaData );
if( wsaret != 0 )
{
    return 0;
}
sockaddr_in local;
local.sin_family = AF_INET; //Address family
local.sin_addr.s_addr = INADDR_ANY; //Wild card IP address
local.sin_port = htons((u_short)8888); //port to use
server = socket( AF_INET, SOCK_STREAM, 0 );
if( server == INVALID_SOCKET )
{
    return 0;
}
if( bind( server, (sockaddr*)&local, sizeof(local) ) != 0 )
{
    return 0;
}
if( listen( server, 10 ) != 0 )
{
    return 0;
}
SOCKET_STREAM_FILE_INFO  StreamFileInfo;
memset( &StreamFileInfo, 0, sizeof(SOCKET_STREAM_FILE_INFO) );
 
SOCKET client;
sockaddr_in from;
int fromlen = sizeof( from );
while( pThis->m_bListen )
{
    char temp[1024];
    memset( temp, 0, 1024 );
    client = accept( server, (struct sockaddr*)&from, &fromlen );
    int iLen = recv( client, temp, sizeof(SOCKET_STREAM_FILE_INFO), 0 );
    if( iLen == sizeof(StreamFileInfo) )
    {
        memcpy( &StreamFileInfo, temp, sizeof(StreamFileInfo) );
        CFile destFile( StreamFileInfo.szFileTitle, 
            CFile::modeCreate | CFile::modeWrite | CFile::typeBinary);
        UINT dwRead = 0;
        while( dwRead < StreamFileInfo.nFileSizeLow )
        {
            memset(temp,0,1024);
            UINT dw = recv( client, temp, 1024, 0 );
            destFile.Write(temp, dw);
            dwRead += dw;
        }
        SetFileTime( (HANDLE)destFile.m_hFile, 
            &StreamFileInfo.ftCreationTime, &StreamFileInfo.ftLastAccessTime, 
            &StreamFileInfo.ftLastWriteTime );
        destFile.Close();
        SetFileAttributes(StreamFileInfo.szFileTitle,
            StreamFileInfo.dwFileAttributes);
        pThis->LoadPicture( StreamFileInfo.szFileTitle );
    }
    closesocket(client);
}
closesocket(server);
WSACleanup();

Load Image File

CFile file( strPictureName, CFile::modeRead );
if (file.GetLength() == 0)
{
    return;
}
CArchive loadArchive( &file, CArchive::load | CArchive::bNoFlushOnDelete);
loadArchive.m_bForceFlat = FALSE;
CArchiveStream arcstream(&loadArchive);
m_spIPicture.Release();
HRESULT hr = OleLoadPicture( &arcstream, 0, FALSE, IID_IPicture, 
    (void**)&m_spIPicture);
loadArchive.Close();
file.Close();