Hi ShamWOW thanks for the reply.
I am not sure if im doing this right but CVI 2013 just says FATAL Error when i try to run doDragDrop.
I edited an example that i found on the internet so that it will compile with CVI.
Im not sure what i am doing wrong or forgetting to do, as i followed the MSDN documentation.
#include "ShlObj.h"
void StartDragDropFile(char *FilePathName,LRESULT* pResult)
{
//COleDataSource datasrc;
IDataObject pdo;
IDropSource pds;
HGLOBAL hgDrop;
DROPFILES* pDrop;
int nSelItem;
UINT uBuffSize = 0;
TCHAR* pszBuff;
UINT g_uCustomClipbrdFormat = RegisterClipboardFormat ( "DisplayGenerator_3BCFE9D1_6D61_4cb6_9D0B_3BB3F643CA82");
FORMATETC etc = { CF_HDROP, NULL, DVASPECT_CONTENT, -1, TYMED_FILE };
*pResult = 0; // return value ignored
LPVOID pvReserved;
OleInitialize(pvReserved);
// For every selected item in the list, put the filename into lsDraggedFiles.
// Calculate the # of chars required to hold this string.
uBuffSize += lstrlen ( FilePathName ) + 1;
// Add 1 extra for the final null char, and the size of the DROPFILES struct.
uBuffSize = sizeof(DROPFILES) + sizeof(TCHAR) * (uBuffSize + 1);
// Allocate memory from the heap for the DROPFILES struct.
hgDrop = GlobalAlloc ( GHND | GMEM_SHARE, uBuffSize );
if ( NULL == hgDrop )
return;
pDrop = (DROPFILES*) GlobalLock ( hgDrop );
if ( NULL == pDrop )
{
GlobalFree ( hgDrop );
return;
}
// Fill in the DROPFILES struct.
pDrop->pFiles = sizeof(DROPFILES);
#ifdef _UNICODE
// If we're compiling for Unicode, set the Unicode flag in the struct to
// indicate it contains Unicode strings.
pDrop->fWide = TRUE;
#endif
// Copy all the filenames into memory after the end of the DROPFILES struct.
pszBuff = (TCHAR*) ((pDrop) + sizeof(DROPFILES));
lstrcpy ( pszBuff, (LPCTSTR) FilePathName );
//pszBuff = 1 + _tcschr ( pszBuff, '\0' );
pszBuff = 1 + ( pszBuff, '\0' );
GlobalUnlock ( hgDrop );
// Put the data in the data source.
//datasrc.CacheGlobalData ( CF_HDROP, hgDrop, &etc );
// Add in our own custom data, so we know that the drag originated from our
// window. CMyDropTarget::DragEnter() checks for this custom format, and
// doesn't allow the drop if it's present. This is how we prevent the user
// from dragging and then dropping in our own window.
// The data will just be a dummy bool.
HGLOBAL hgBool;
hgBool = GlobalAlloc ( GHND | GMEM_SHARE, sizeof(char) );
if ( NULL == hgBool )
{
GlobalFree ( hgDrop );
return;
}
// Put the data in the data source.
etc.cfFormat = g_uCustomClipbrdFormat;
//datasrc.CacheGlobalData ( g_uCustomClipbrdFormat, hgBool, &etc );
// Start the drag 'n' drop!
//DROPEFFECT dwEffect = datasrc.DoDragDrop ( DROPEFFECT_COPY | DROPEFFECT_MOVE );
STGMEDIUM stgmed = {TYMED_FILE,{FilePathName},0};
pdo.lpVtbl->SetData(&pdo,&etc,&stgmed,0);
DWORD dwEffect;
HRESULT hr = DoDragDrop (&pdo, &pds,DROPEFFECT_MOVE | DROPEFFECT_COPY, &dwEffect);
// If the DnD completed OK, we remove all of the dragged items from our
// list.
switch ( dwEffect )
{
case DROPEFFECT_COPY:
case DROPEFFECT_MOVE:
{
// The files were copied or moved.
// Note: Don't call GlobalFree() because the data will be freed by the drop target.
}
break;
case DROPEFFECT_NONE:
{
// This needs special handling, because on NT, DROPEFFECT_NONE
// is returned for move operations, instead of DROPEFFECT_MOVE.
// See Q182219 for the details.
// So if we're on NT, we check each selected item, and if the
// file no longer exists, it was moved successfully and we can
// remove it from the list.
GlobalFree ( hgDrop );
GlobalFree ( hgBool );
}
break; // end case DROPEFFECT_NONE
} // end switch
OleUninitialize();
}
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