Composite document operation-read/write struct

Storage Structure
:

# Include "stdafx. H"
# Include <objbase. H.>

# Define result_ OK (HR) if (! Succeeded (HR) goto exit0;
# Define release_interface (x) if (x) {(x)-> release (); (x) = NULL ;}

Class tempdata
{
Public:
Char data [256];
Int count;
} * P;

Int _ tmain (INT argc, _ tchar * argv [])
{
Istorage * pistr = NULL;
Istorage * pisubstr = NULL;
Hresult hR = e_fail;
Istream * pistream = NULL;
Ulong ulsize = 0;
Tchar szbuf [] = _ T ("0123456789 ");
Const tchar * pszfilename = _ T ("C: // test. MCB ");

Tempdata data;

Char temp [] = "1234567890 ";
Data. Count = strlen (temp );
Strcpy (data. Data, temp );
P = & data;
HR = coinitialize (null );
Result_ OK (HR );

// Create a composite document
HR = stgcreatedocfile (pszfilename, stgm_direct | stgm_create | stgm_readwrite | stgm_clu_exclusive, null, & pistr );
Result_ OK (HR );

// Create a data stream
HR = pistr-> createstream (_ T ("mcbstream"), stgm_direct | stgm_create | stgm_readwrite | stgm_clu_exclusive, 0, 0, & pistream );
Result_ OK (HR );

// Write data
// HR = pistream-> write (szbuf, _ tcslen (szbuf) * sizeof (tchar), & ulsize );
HR = pistream-> write (p, sizeof (tempdata), & ulsize );
Result_ OK (HR );

Exit0:

// Release_interface (pistream );
Release_interface (pisubstr );
Release_interface (pistr );

Couninitialize ();

Return 0;
}

Read struct
:

# Include "stdafx. H"
# Include <objbase. H.>

# Define result_ OK (HR) if (! Succeeded (HR) goto exit0;
# Define release_interface (x) if (x) {(x)-> release (); (x) = NULL ;}

Class tempdata
{
Public:
Char data [256];
Int count;
} * P;

Int _ tmain (INT argc, _ tchar * argv [])
{
Istorage * pistr = NULL;
Hresult hR = e_fail;
Istream * pistream = NULL;
Ulong ulsize = 0;
Const tchar * pszfilename = _ T ("C: // test. MCB ");

HR = coinitialize (null );
Result_ OK (HR );

// Create a composite document
HR = stgopenstorage (pszfilename, null, stgm_direct | stgm_readwrite | stgm_clu_exclusive, null, null, & pistr );
Result_ OK (HR );

HR = pistr-> openstream (_ T ("mcbstream"), null, stgm_direct | stgm_readwrite | stgm_clu_exclusive, null, & pistream );

Tempdata data;
P = & data;
HR = pistream-> Read (p, sizeof (tempdata), & ulsize );

Messageboxa (0, P-> data, 0, 0 );

Exit0:

Release_interface (pistream );
Release_interface (pistr );
Return 0;
}

 

Environment: WINXP (SP3) + IE8

IDE: vs2005