C / C++ / MFC

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Clipboard notification User 66587-May-02 7:01 User 6658 7-May-02 7:01  Hi! Is there a better way to check whether the data in a clipboard has changed instead of checking the content every few seconds with a timer? Perhaps there is a kind of notification? /edit: I just found the message WM_DRAWCLIPBOARD - is it what I'm searching for? thanks in advance regards modified 12-Sep-18 21:01pm. Yup 7-May-02 7:22 7-May-02 7:22  From MSDN: The WM_DRAWCLIPBOARD message is sent to the first window in the clipboard viewer chain when the content of the clipboard changes. This enables a clipboard viewer window to display the new content of the clipboard. who knows that? Atilla Selem7-May-02 6:38 Atilla Selem 7-May-02 6:38  how can i be able to display my custom Context Menu when i right-clicked in an EditBox instead of default EditBox context menu (Undo, copy, paste..etc)? that would be really helpful for me... Thanks for ur help Atilla Selem just listening to you... Re: who knows that? Chris Losinger7-May-02 6:49 Chris Losinger 7-May-02 6:49  try the edit control section of this site... or... http://www.codeproject.com/useritems/cmenuedit.asp -c I don't care, and you can't make me. Smaller Animals Software Drag and Drop bitmaps !!! Hadi Rezaee7-May-02 4:56 Hadi Rezaee 7-May-02 4:56  Hi again, Did you see Solitaire game(I'm sure you saw that !). I want to know, how can drag and drop pictures like that ? Please help me ... My month article: Game programming by DirectX by Lan Mader. Please visit in: www.geocities.com/hadi_rezaie/index.html Hadi Rezaie Re: Drag and Drop bitmaps !!! Chris Hambleton7-May-02 5:23 Chris Hambleton 7-May-02 5:23  Hi, I had to do the same thing about a year ago for my card game and it works great: (UltraUno -- http://www.outreach4him.50megs.com/UltraUno/ -- yes, this is a plug! ) I found Chris Maunder's article on bitmap controls very useful, but it looks like the link is broken (not sure who I would notify to fix it): http://www.codeproject.com/bitmap/bitmappicture.asp His control is derived from a CStatic, and the way I did the drag and drop stuff is to create one CBitmapPicture controls in the view and use the WM_LBUTTONDOWN to see if the user clicked the bitmap control. I set a flag and then track the WM_MOUSEMOVE messages and move the bitmap around based upon the initial coordinates and the current coordinates. When the WM_LBUTTONUP msg is received, I release the capture on the bitmap control. If needbe, I can e-mail you a code sample directly... Chris Re: Drag and Drop bitmaps !!! Hadi Rezaee7-May-02 5:43 Hadi Rezaee 7-May-02 5:43  Hello Chris, Thanks aloooooooooooot for your help I see your game, that was prefect ... YES, i'm intrested to have your source code. If possible please send it to hadi_rezaie@yahoo.com Thx aloooooooooot ! My month article: Game programming by DirectX by Lan Mader. Please visit in: www.geocities.com/hadi_rezaie/index.html Hadi Rezaie Q: how to obtain interface pointer for ATL ActiveX control in an MFC app Gil Clark7-May-02 4:53 Gil Clark 7-May-02 4:53  OK, I'm relatively new to ATL/ActiveX/COM. We have an MFC application (CView and CDialog usage) built with VC++6 SP5. I am in the process of creating an ActiveX control (via ATL) that will be used by this application, but I'm having a problem. I can insert the control onto the template in the resource editor and it shows up. I run the application and the control functions properly. But I need to have access to the interface of that control. I used: CAxWindow m_axTheControlWindow; CComPtr<ITheControlInterface> m_ctlTheControl; CWnd* pControl = GetDlgItem(IDC_THECONTROLID); if (pControl) { m_axTheControlWindow.Attach(pControl->GetSafeHwnd()); hr = m_axTheControlWindow.QueryControl(&m_ctlTheControl); if (FAILED(hr) || !m_ctlTheControl) { ATLASSERT(false); } } but QueryControl returns E_FAIL and m_ctlTheControl is NULL. I guess it has something to do with how MFC keeps track of OLE controls (COleControlContainer) ??? Perhaps the only way I could communicate with this control would be via IDispatch? The control was create via the VC++ Insert | New ATL Object... wizard. It's a Full Control (Single Threaded, Dual interface, No aggregation, Support ISupportErrorInfo, support connection points, not based on another control, normalize dc, insertable, opaque, solid background, no stock properties). Now, this is just the bare-bones wizard code. Nothing has been implemented as far as IDispatch or ISupportErrorInfo or connection points beyond what the wizard gives, but I didn't want to go too far before finding out it wasn't going to work. Thanks for any help. Gil Re: Q: how to obtain interface pointer for ATL ActiveX control in an MFC app Gil Clark8-May-02 7:13 Gil Clark 8-May-02 7:13  OK, now that this is buried deep it probably won't be seen, but a co-worker of mine has helped me figure this out. CWnd* pControl = GetDlgItem(IDC_THECONTROLID); if (pControl) { pControl->EnableAutomation(); IUnknown* pUnk = pControl->GetControlUnknown(); CComQIPtr<ITheControl> pIFace(pUnk); if(pIFace) { pIFace->AControlMethod(value); } } Display a dialog box from a DLL COM Jerome Conus7-May-02 4:38 Jerome Conus 7-May-02 4:38  Hi ! I started to develop an ATL object with VC++ 6.0. The COM object is a DLL, supporting the MFC. In some particular situation, I need to display a dialog box. I created a new class, derived from CDialog, as I usually do with a normal MFC application (Let's call this class CTestDlg). In the ATL class, I added a member of type of my dialog class (CTestDlg m_myDialog), and when I want to display it, I do : m_myDialog.DoModal(); When I run this COM object, at the moment of displaying the dialog, I get an ASSERT error. In the debugger, the failed assertion is : ASSERT(afxCurrentResourceHandle != NULL) which is called in the function CDialog::OnInitDialog() I'm now wondering if a COM Dll is able to display a dialog box, and if yes, how I'm supposed to do it !!! Any help will be greatly appreciated ! Thank you ! Jerome Re: Display a dialog box from a DLL COM Chris Losinger7-May-02 5:08 Chris Losinger 7-May-02 5:08  yes, it's possible to do this (i do it all the time). 1. where are you calling DoModal ? (don't do it in the ATL object's constructor) 2. are you using that little MFC context macro (forget what it is, but you see it at the top of methods that use MFC...) ? -c I don't care, and you can't make me. Smaller Animals Software Re: Display a dialog box from a DLL COM Jerome Conus7-May-02 5:13 Jerome Conus 7-May-02 5:13  Chris Losinger wrote: 1. where are you calling DoModal ? (don't do it in the ATL object's constructor) From a method which is part of my interface. 2. are you using that little MFC context macro (forget what it is, but you see it at the top of methods that use MFC...) ? ...mmm....nope, I didn't find any context stuff.... Jerome Re: Display a dialog box from a DLL COM Jonathan Craig7-May-02 5:46 Jonathan Craig 7-May-02 5:46  Chris is refering to the AFX_MANAGE_STATE(AfxGetStaticModuleState()) macro that gets added to ATL method when added thought the Class View add method option. This is needed so the application looks at the right resource table when executing the ATL methods. If your ATL object is using its own resources (dialogs, bitmaps, cursors, etc.) you must call the manage state macro. Hope this helps... Jonathan Craig www.mcw-tech.com Re: Display a dialog box from a DLL COM Jerome Conus7-May-02 5:55 Jerome Conus 7-May-02 5:55  Ok....I'm making some progress. I have this AFX_MANAGE_STATE in each of my methods of my interface. I figured out what I was doing wrong. I tried to display a dialog box, derived from CDialog. Now, I used the 'Insert ATL Object->Miscellaneous->Dialog' to create my dialog. I have a problem remaining though : I have a CListBox in my dialog box, and when I do CListBox* pList=(CListBox*)GetDlgItem(IDC_LIST); it works, but then, when I do pList->AddString("Test"); I have an ASSERTION failure. Do you have any idea how I could use the ListBox control (and any other controls ?) Thanks ! Jerome does CTreeCtrl have this function? 7-May-02 4:23 7-May-02 4:23  hi, I want to get the index of the element clicked in a tree.I can get total elements but can I get the index or relative position of the element I clicked?It may be even in the child nodes. I have figured out a way but it seems too complicated so wanted to check first; but again it may be how the function would have operated if existed,I dont know. So,can I? Sorry about the premature entry waiting. Re: does CTreeCtrl have this function? Philip Patrick7-May-02 6:35 Philip Patrick 7-May-02 6:35  Nope, there is no index in CTreeCtrl. You can only enumerate thru items and count them manually Philip Patrick Web-site: www.stpworks.com "Two beer or not two beer?" Shakesbeer Need Web-based database administrator? You already have it! Re: does CTreeCtrl have this function? Joel Lucsy7-May-02 11:33 Joel Lucsy 7-May-02 11:33  A method would be to store an index in the items data: SetItemData. Then when you need: GetItemData. Joel Lucsy (jjlucsy@ameritech.net) does CTreeCtrl have this fuction? 7-May-02 4:19 7-May-02 4:19  hi, I want to get the index of the element clicked in a tree.I can get total elements but can I get the index or position of the element I clicked? Re: does CTreeCtrl have this fuction? Chris Losinger7-May-02 4:26 Chris Losinger 7-May-02 4:26  CTreeCtrl::GetSelectedItem -c I don't care, and you can't make me. Smaller Animals Software Some DLL questions !!! Hadi Rezaee7-May-02 4:15 Hadi Rezaee 7-May-02 4:15  Hi there, Please answer to my questions about DLL … Q1. I want to write simple function in a Win32 DLL project … And call that by LoadLibrary … I made a Win32 DLL project … Then I wrote this function in .h file: __declspec(dllexport) void SayHello(); And I wrote it in .cpp file: void SayHello() { MessageBox(NULL, “Helllllllllo !”, “Info”, MB_ICONINFORMATION); } Then I compiled it without any problem … In my MFC exe project … I loaded that: CoInitialize(NULL); HMODULE hModule = LoadLibrary( "test4.dll" ); FARPROC procFunc; procFunc = GetProcAddress(hModule, "SayHello"); (procFunc)(); FreeLibrary(hModule); CoUninitialize(); There is no problem in DLL path file, I checked it … But when I run this code, program show me this error: “Unhandled exception in testdll.exe : 0x0000005 : Access violation.” What is my wrong ? Q2. If I write a DLL by MFC DLL, can I use of that from other programming language like Delphi or VB ? My month article: Game programming by DirectX by Lan Mader. Please visit in: www.geocities.com/hadi_rezaie/index.html Hadi Rezaie Re: Some DLL questions !!! Chris Losinger7-May-02 4:27 Chris Losinger 7-May-02 4:27  are you testing hMoudle or procFunc for NULL ? you should. -c I don't care, and you can't make me. Smaller Animals Software Re: Some DLL questions !!! Hadi Rezaee7-May-02 5:08 Hadi Rezaee 7-May-02 5:08  Ok, hMoudle returned value ... But procFunc returned NULL !!! Can you help me, please ? My month article: Game programming by DirectX by Lan Mader. Please visit in: www.geocities.com/hadi_rezaie/index.html Hadi Rezaie Re: Some DLL questions !!! Paul M Watt7-May-02 5:23 Paul M Watt 7-May-02 5:23  The reason that GetProcAddress returns NULL is because the SayHello function does not exist in your dll. C++ Name mangling would change that to an entry like this: SayHello@@YAXXZ. I answered this question with more detail in the other thread. Build a man a fire, and he will be warm for a day Light a man on fire, and he will be warm for the rest of his life! Re: Some DLL questions !!! Paul M Watt7-May-02 5:20 Paul M Watt 7-May-02 5:20  You are having a problem with the name mangling that the c++ compier does on functions. The compiler will generate and export this symbol instead: SayHello@@YAXXZ So if you want to call load library on this function, then you need to ask for that symbol instead. If you chang the signature of the function, the mangling will change as well, so you will have to use the Depends tool that came VC++ to determine what the name of the exported symbol is. If you would like to turn off name mangling for this function you can prepend your function definition with this: extern "C" void SayHello(); About your second question, yes you will be able to use your functions from a DLL in Delphi or VB as long as you only declare functions, if you would like to use a class that you exported from an MFC or a C++ DLL then you will need to create a COM component to represent that class. Also, I would recommend turning off name mangling if you plan on using these functions in Delphi or VB. Good Luck. Build a man a fire, and he will be warm for a day Light a man on fire, and he will be warm for the rest of his life! Re: Some DLL questions !!! Hadi Rezaee7-May-02 6:19 Hadi Rezaee 7-May-02 6:19  Hi dear kilowatt Thanks for reply ... I got confused I runed Dependes program and that show me this function in my DLL: ?SayHello@@YAXXZ In fact, i want to use this DLL in Delphi program ... Now, Please please please tell me how could i fix it ? I must make .DEF file ? But i don't know what i must write in that !!! Plz help me ... My month article: Game programming by DirectX by Lan Mader. Please visit in: www.geocities.com/hadi_rezaie/index.html Hadi Rezaie

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