C / C++ / MFC

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Proper use of _bstr_t nibor27-Jul-03 23:12 nibor 27-Jul-03 23:12  Hi everybody! Can anybody tell me how to use BSTR and _bstr_t properly? I have an array of _bstr_t strings putting them into this array like this: <br /> _bstr_t* arr = new _bstr_t[100];<br /> <br /> // (The compiler doesn't accept non-casted BSTR_string here)<br /> arr[0] = L"string_one" + _bstr_t(BSTR_string) + L"string_three";<br /> arr[1] += L"string";<br /> My problem: Sometimes there are other array elements affected by changing the content of other ones!!! Idea: It seems to be a problem of using pointers internally by _bstr_t or missing "SysAllocString" function use... how to connect to dbase server using postgres mhar27-Jul-03 22:55 mhar 27-Jul-03 22:55  HI, Can anyone help me with this. I have a program that will connect to data base server using postgres. I would appreciate any help... Thanks ! Mar Solero Jr. Re: how to connect to dbase server using postgres basementman28-Jul-03 5:12 basementman 28-Jul-03 5:12  Have you tried the PostGreSQL ODBC driver?  onwards and upwards...  _open routine El'Cachubrey27-Jul-03 22:38 El'Cachubrey 27-Jul-03 22:38  Hi all I try to open file use _open routine with OF_BINARY|OF_RDWR|CF_CREAT|CF_TRUNC parameters but when i open first file _open("ffile",_O_BINARY|_O_RDWR|_O_CREAT|_O_TRUNC) file created fine. But when i try to open another file _open("sfile",_O_BINARY|_O_RDWR|_O_CREAT|_O_TRUNC)file created too but have read only atribute. Why this file has read only atribute, i use same parameters as a first time but in first file dont have this atribute but in second time file have one?? Re: _open routine Johnny ²28-Jul-03 3:49 Johnny ² 28-Jul-03 3:49  Looking at the MSDN for _open it states: The pmode argument is required only when _O_CREAT is specified. If the file already exists, pmode is ignored. Otherwise, pmode specifies the file permission settings, which are set when the new file is closed the first time So basically you need to specify the 3rd argument to specify the permissions: _open ("ffile",_O_BINARY|_O_RDWR|_O_CREAT|_O_TRUNC, _S_IREAD | _S_IWRITE ) I would image not giving the pmode in this case causes the subtle error you described. How to display the item of a treectrl like this? allenhu27-Jul-03 21:41 allenhu 27-Jul-03 21:41  in a treectrl,when a root item is expanded , a kind of icon associated with the item is displayed,and when that root item is shrink,another kind of the icon is displayed. thank you Re: How to display the item of a treectrl like this? Iain Clarke, Warrior Programmer27-Jul-03 23:05 Iain Clarke, Warrior Programmer 27-Jul-03 23:05  If you browse the Platform SDK, and look at the overview for Tree View controls, it has a few paragraphs about "Item States", which is what you are interested in. Look up these member functions / messages as well: CTreeCtrl::SetImageList (CImageList *, TVSIL_STATE) / TVM_SETIMAGELIST, TVSIL_STATE, (LPARAM)hImageList. Iain. Re: How to display the item of a treectrl like this? dan o27-Jul-03 23:13 dan o 27-Jul-03 23:13  hi, create a imagelist .h CImageList m_cImageList; .cpp populate event() if (1) //bDoThisOnlyOnce m_cImageList.Create(IDB_TREEVIEW, 16, 10, RGB (255, 0, 255)); //IDB_TREEVIEW resource bitmap with a the all icons GetTreeCtrl().SetImageList(&m_cImageList, TVSIL_NORMAL); rootitem = GetTreeCtrl().InsertItem(TVIF_PARAM | TVIF_TEXT | TVIF_IMAGE | TVIF_SELECTEDIMAGE, _T("RootItem"), ILI_CLOSED_FOLDER, ILI_CLOSED_FOLDER, 0, 0, -1, TVI_ROOT, TVI_SORT ); //ILI_CLOSED_FOLDER, ILI_CLOSED_FOLDER <- item nr of imagelist Add msg .h afx_msg void OnItemexpanded(NMHDR* pNMHDR, LRESULT* pResult); .cpp void CMyTreeView::OnItemexpanding(NMHDR* pNMHDR, LRESULT* pResult) { NM_TREEVIEW* pNMTreeView = (NM_TREEVIEW*)pNMHDR; HTREEITEM hItem = pNMTreeView->itemNew.hItem; CString string;string = GetPathFromItem (hItem); *pResult = FALSE; int inImage, inSelectedImage; if (pNMTreeView->action == TVE_EXPAND) { if (GetTreeCtrl().GetParentItem (hItem) == NULL ) { GetTreeCtrl().GetItemImage( hItem, inImage, inSelectedImage ); if (inImage == ILI_CLOSED_FOLDER && inSelectedImage == ILI_CLOSED_FOLDER) { GetTreeCtrl().SetItemImage( hItem, ILI_OPEN_FOLDER, ILI_OPEN_FOLDER); } } } else { // pNMTreeView->action == TVE_COLLAPSE if (GetTreeCtrl().GetParentItem (hItem) == NULL) { GetTreeCtrl().GetItemImage( hItem, inImage, inSelectedImage ); if (inImage == ILI_OPEN_FOLDER && inSelectedImage == ILI_OPEN_FOLDER) { GetTreeCtrl().SetItemImage( hItem, ILI_CLOSED_FOLDER, LI_CLOSED_FOLDER); } } } hope it helps dan o hope it helps Parameters for MSComm petr.me27-Jul-03 21:37 petr.me 27-Jul-03 21:37  Hi all, I use MSComm for serial communication with very simple external device: CComVariant Transfer; VariantClear(&Transfer); Transfer = CString(CString((char)P_1) + CString((char)P_2) + CString((char)D_1) + CString((char)P_3)); msComm.SetOutput(Transfer); // Wait for answer VariantClear(&Transfer); Transfer = msComm.GetInput(); CString sReturned = Transfer.bstrVal; P_1, P_2, D_1, P_3 are constants and usually non zero - however, zero value generate problem. When D_1 == 0, CString is shortened (P_3 is missing) and communication fall in troubles. How can I enter binary array into Transfer instead of text string? How can I retrieve binary array from Transfer filled with response? Environment: W2k, VC++ 6 Thanks for suggestions. Petr Suche Leute zum MFC / C++ lernen schonu27-Jul-03 21:04 schonu 27-Jul-03 21:04  <strike> :(Hallo !! Ich suche Leute zum lernen von MFC und C++. Ich komme aus der nähe von Dortmund und suche Leute aus dieser Region um sich 1 mal die Woche zu treffen und sich gemeinsam auszutauschen und zu lernen Meldet Euch cu Dirk cadnt@web.de</strike> schonus Re: Suche Leute zum MFC / C++ lernen Philip Patrick28-Jul-03 1:20 Philip Patrick 28-Jul-03 1:20  Das ist English-speaking site AFAIK Philip Patrick Web-site: www.stpworks.com "Two beer or not two beer?" Shakesbeer Re: Suche Leute zum MFC / C++ lernen peterchen28-Jul-03 4:41 peterchen 28-Jul-03 4:41  schon wen gefunden? "Der Geist des Kriegers ist erwacht / Ich hab die Macht" StS sighist | Agile Programming | doxygen Win32 vc++ Smooth Animation koxin27-Jul-03 20:54 koxin 27-Jul-03 20:54  Hello, I've implemented double-buffering in my windows based game but the movement is still "choppy". Does anybody know how to get rid of this effect (i.e. syncronize the object's movement with the screen build-up)? Under DOS and Win16 I used to do this by reading directly from the VGA port but Win32 won't allow this. thankx, Koxin Re: Win32 vc++ Smooth Animation Iain Clarke, Warrior Programmer27-Jul-03 23:14 Iain Clarke, Warrior Programmer 27-Jul-03 23:14  In normal GDI, you can't do this. The nearest you can come is to draw into a memory DC and bitblt it to the screen in one go. Which I assume you have done. You need to move to DirectDraw / Direct3D. Then you can draw into a "back surface", and flip it to the front synchronously with the screen redraw. Such a change is beyond an answer in this forum, but there is a DirectX section on codeproject which has a lot of examples for you. Iain. how can i apply a macro to all project files sunil_g1727-Jul-03 20:15 sunil_g17 27-Jul-03 20:15  hi i have written a macro, which will comment/uncomment all the occurences of a particular function call like all printfs in the opened file i want to do the same operation for all project files, can any one help me, Regards Sunil How to PRINT MsWord DOC through VC++ Dlg based Prg 22491727-Jul-03 20:01 224917 27-Jul-03 20:01  How to PRINT MsWord Document through VC++ Dialog based Program. Please Help me .. Re: How to PRINT MsWord DOC through VC++ Dlg based Prg wb27-Jul-03 22:41 wb 27-Jul-03 22:41  hm.... If Word is installed on the PC, then you can use ShellExecute() with the the "print" param. If word is not installed.... Saving graph Neha27-Jul-03 20:00 Neha 27-Jul-03 20:00  Hello, I have a graph displayed in a window. I want to save that graph in a .bmp file. I use VC++ 6.0 and MFC. How can i do that? Best Regards Neha Re: Saving graph Alexander M.,28-Jul-03 3:19 Alexander M., 28-Jul-03 3:19  create a compatible dc, create a bitmap, select it, then draw on it by using gdi functions! for storing it, read msdn! Don't try it, just do it! How can I clear drop list combo box? Emre Zorlu27-Jul-03 19:46 Emre Zorlu 27-Jul-03 19:46  I can clear drop down combo box with m_comboBox.SetSel (0,-1); m_comboBox.Clear (); but I can't clear drop list combo box ! How can I do this ? emroz Re: How can I clear drop list combo box? Frank K27-Jul-03 19:52 Frank K 27-Jul-03 19:52  Hi, use m_comboBox.ResetContent(); Regards Frank Re: How can I clear drop list combo box? Emre Zorlu27-Jul-03 21:23 Emre Zorlu 27-Jul-03 21:23  m_comboBox.ResetContent(); delete all content and m_comboBox.DeleteString(ndx); delete one string. I don't wanna delete any string. I just wanna make null. emroz Re: How can I clear drop list combo box? David Crow28-Jul-03 5:16 David Crow 28-Jul-03 5:16  Emre Zorlu wrote: I just wanna make null. Which makes no sense in this context. If you are not wanting to remove any items from the control, what are you wanting to do? If you simply want to add an empty string to the control, use AddString(""). Re: How can I clear drop list combo box? wb27-Jul-03 22:42 wb 27-Jul-03 22:42  m_comboBox.SetCurSel(-1) web cam Anonymous27-Jul-03 18:07 Anonymous 27-Jul-03 18:07  is there a way I can control the working of a webcam using a windows application . if yes what are the API's I need to look at ?

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