Thread: File summary attributes

Oh there's likely to be something windows specific.

Did you start with say
http://www.google.com/search?q=file+....microsoft.com
?

I previously posted a sample that does this here (towards the bottom under DocProps). However, it is slightly LCC-WIN specific so I made a few changes to make it compatible with MSVC. It should also work with Dev-C++, but my (fairly old) version did not have adequately up-to-date header files. The code is C++ (not C). You should still check out the linked sample because there are some notes in the readme file. Obviously, this is entirely Windows specific (you did post on the Windows board). I'm not aware of nix having a similar document properties scheme.

Code:

/*
Code by TMouse.

Also see:
http://users.chello.be/ws36637/properties2.html
http://msdn.microsoft.com/library/en-us/stg/stg/writeread_sample.asp
*/

#include <objbase.h>
#include <stdio.h>

#if defined(_MSC_VER)
#pragma comment(lib, "ole32.lib")
#endif


// ================================================================================
HRESULT SetDocProperties(LPCWSTR      szFile,
                         LONG         cProps,
                         PROPSPEC*    pPropSpecs,
                         PROPVARIANT* pPropVars)
{
	HRESULT hr;
	IPropertySetStorage* pStg       = NULL;
	IPropertyStorage*    pPropStg   = NULL;

	// Open file. We could use StgCreateStorageEx() if we wanted to create the file.
	hr = StgOpenStorageEx(szFile,
	                      STGM_READWRITE | STGM_SHARE_EXCLUSIVE,
	                      STGFMT_ANY, 0, NULL, NULL,
	                      IID_IPropertySetStorage, (void**) &pStg);

	if (SUCCEEDED(hr))
	{
		// Now open the standard document properties...
		hr = pStg->Open(FMTID_SummaryInformation,
		                STGM_READWRITE | STGM_SHARE_EXCLUSIVE, &pPropStg);

		// If the property set dosen't exist, we create it...
		if (hr == STG_E_FILENOTFOUND)
		{
			hr = pStg->Create(FMTID_SummaryInformation, &FMTID_SummaryInformation,
			                  PROPSETFLAG_DEFAULT,
				          STGM_READWRITE | STGM_SHARE_EXCLUSIVE | STGM_CREATE, &pPropStg);
		}

		if (SUCCEEDED(hr))
		{
			// Write Properties...
			hr = pPropStg->WriteMultiple(cProps, pPropSpecs, pPropVars, 100);

			// Commit changes to file...
			pPropStg->Commit(STGC_DEFAULT);
		}
	}

	if (pStg)     pStg->Release();
	if (pPropStg) pPropStg->Release();

	return hr;
}


// ================================================================================
HRESULT SetDocPropertyString(LPCWSTR szFile, PROPID propid, LPCWSTR szValue)
{
	PROPSPEC    PropSpec    = { PRSPEC_PROPID, propid };
	PROPVARIANT PropVariant = { 0 };

	PropVariant.vt      = VT_LPWSTR;
	PropVariant.pwszVal = (LPWSTR) szValue;

	return SetDocProperties(szFile, 1, &PropSpec, &PropVariant);
}


// ================================================================================
int main(void) 
{
	HANDLE      hFile;
	HRESULT     hr;
	PROPVARIANT PropVariants[3];
	PROPSPEC    PropSpecs[3];

	CoInitialize(NULL);

	// Create file to play with...
	hFile = CreateFile("TEST.TXT", GENERIC_WRITE, FILE_SHARE_READ, NULL,
	                   OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
	CloseHandle(hFile);

	// Set a single property...
	hr = SetDocPropertyString(L"test.txt", PIDSI_COMMENTS, L"These are some comments.");
	if (FAILED(hr)) printf("Failed to set property on test.txt. Is this drive NTFS?\n");

	// Now set multiple properties at once...
	PropSpecs[0].ulKind = PRSPEC_PROPID;
	PropSpecs[0].propid = PIDSI_TITLE;
	PropVariants[0].vt = VT_LPWSTR;
	PropVariants[0].pwszVal = L"Document Summaries Sample";

	PropSpecs[1].ulKind = PRSPEC_PROPID;
	PropSpecs[1].propid = PIDSI_AUTHOR;
	PropVariants[1].vt = VT_LPSTR;
	PropVariants[1].pszVal = "TMouse";

	PropSpecs[2].ulKind = PRSPEC_PROPID;
	PropSpecs[2].propid = PIDSI_KEYWORDS;
	PropVariants[2].vt = VT_LPWSTR;
	PropVariants[2].pwszVal = L"Title, Subject, Author, Comments, Document Properties, COM, OLE";

	hr = SetDocProperties(L"test.txt", 3, PropSpecs, PropVariants);
	if (FAILED(hr)) printf("Failed to set properties on test.txt.\n");

	// Set a property on a word doc (this file must already exist)...
	hr = SetDocPropertyString(L"test.doc", PIDSI_SUBJECT, L"The wonders of...");
	if (FAILED(hr)) printf("Failed to set property on test.doc. Does it exist?\n");

	CoUninitialize();
	printf("Press ENTER to continue...\n");
	getchar();

	return 0;
}

What other OS did you have in mind?