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  • Detect insertion of media into a drive using windows messages

    - by rschnorenberg
    I am currently using WM_DEVICECHANGE to be notified when new USB drives are connected to the computer. This works great for devices like thumb-drives where as soon as the device arrives it is ready to have files read from it. For devices like SD card readers it does not because the message is sent out once when the device is connected but no message is sent when a user actually inserts a card into the device. Is it possible to detect the insertion of new media into an existing USB device without having to use polling?

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  • Transactional NTFS (TxF) on Process.Start()

    - by Ian
    Consider the following code: try { using(TransactionScope) { Process.Start("SQLInstaller.EXE"); throw new Exception(); Commit(); } } catch(Exception ex) { //Do something here } Will the changes made by SQLInstaller.exe be rollback in this scenario? More specifically, will the changes made by an external process launched through Process.Start() be handled by TxF? Thanks!

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  • Dialog created after first becomes unresponsive unless created first?

    - by Justin Sterling
    After creating the initial dialog box that works perfectly fine, I create another dialog box when the Join Game button is pressed. The dialog box is created and show successfully, however I am unable to type in the edit box or even press or exit the dialog. Does anyone understand how to fix this or why it happens? I made sure the dialog box itself was not the problem by creating and displaying it from the main loop in the application. It worked fine when I created it that way. So why does it error when being created from another dialog? My code is below. This code is for the DLGPROC function that each dialog uses. #define WIN32_LEAN_AND_MEAN #include "Windows.h" #include ".\Controllers\Menu\MenuSystem.h" #include ".\Controllers\Game Controller\GameManager.h" #include ".\Controllers\Network\Network.h" #include "resource.h" #include "main.h" using namespace std; extern GameManager g; extern bool men; NET_Socket server; extern HWND d; HWND joinDlg; char ip[64]; void JoinMenu(){ joinDlg = CreateDialog(g_hInstance, MAKEINTRESOURCE(IDD_GETADDRESSINFO), NULL, (DLGPROC)GameJoinDialogPrompt); SetFocus(joinDlg); // ShowWindow(joinDlg, SW_SHOW); ShowWindow(d, SW_HIDE); } LRESULT CALLBACK GameJoinDialogPrompt(HWND Dialogwindow, UINT Message, WPARAM wParam, LPARAM lParam){ switch(Message){ case WM_COMMAND:{ switch(LOWORD(wParam)){ case IDCONNECT:{ GetDlgItemText(joinDlg, IDC_IP, ip, 63); if(server.ConnectToServer(ip, 7890, NET_UDP) == NET_INVALID_SOCKET){ LogString("Failed to connect to server! IP: %s", ip); MessageBox(NULL, "Failed to connect!", "Error", MB_OK); ShowWindow(joinDlg, SW_SHOW); break; }   } LogString("Connected!"); break; case IDCANCEL: ShowWindow(d, SW_SHOW); ShowWindow(joinDlg, SW_HIDE); break; } break; } case WM_CLOSE: PostQuitMessage(0); break; } return 0; } LRESULT CALLBACK GameMainDialogPrompt(HWND Dialogwindow, UINT Message, WPARAM wParam, LPARAM lParam){ switch(Message){ case WM_PAINT:{ PAINTSTRUCT ps; RECT rect; HDC hdc = GetDC(Dialogwindow);    hdc = BeginPaint(Dialogwindow, &ps); GetClientRect (Dialogwindow, &rect); FillRect(hdc, &rect, CreateSolidBrush(RGB(0, 0, 0)));    EndPaint(Dialogwindow, &ps);    break;  } case WM_COMMAND:{ switch(LOWORD(wParam)){ case IDC_HOST: if(!NET_Initialize()){ break; } if(server.CreateServer(7890, NET_UDP) != 0){ MessageBox(NULL, "Failed to create server.", "Error!", MB_OK); PostQuitMessage(0); return -1; } ShowWindow(d, SW_HIDE); break; case IDC_JOIN:{ JoinMenu(); } break; case IDC_EXIT: PostQuitMessage(0); break; default: break; } break; } return 0; } } I call the first dialog using the below code void EnterMenu(){ // joinDlg = CreateDialog(g_hInstance, MAKEINTRESOURCE(IDD_GETADDRESSINFO), g_hWnd, (DLGPROC)GameJoinDialogPrompt);// d = CreateDialog(g_hInstance, MAKEINTRESOURCE(IDD_SELECTMENU), g_hWnd, (DLGPROC)GameMainDialogPrompt); } The dialog boxes are not DISABLED by default, and they are visible by default. Everything is set to be active on creation and no code deactivates the items on the dialog or the dialog itself.

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  • Does OpenGL stencil test happen before or after fragment program runs?

    - by david
    When I set glStencilFunc( GL_NEVER, . . . ) effectively disabling all drawing, and then run my [shader-bound] program I get no performance increase over letting the fragment shader run. I thought the stencil test happened before the fragment program. Is that not the case, or at least not guaranteed? Replacing the fragment shader with one that simply writes a constant to gl_FragColor does result in a higher FPS.

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  • keyboard layout direction

    - by mike
    hi, I would like to detect the direction of the current typing (input) language. I may detect the language by means of "GetKeyboardLayout", but then I'll have to check if it equals to Arabic or Hebrew and so on, is there any way just to detect the direction, i.e. left to right or right to left. thanks! mike.

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  • Windows Ribbon Framework: How to change font face and size?

    - by Ian Boyd
    How do you change the font face and font size used by the Windows Ribbon Framwork? Background The user can configure Windows to use their preferred font size, e.g.: 8pt 9pt 12pt and their preferred font face, e.g.: MS Sans Serif Microsoft Sans Serif Tahoma Segoe UI Calibri but the Windows Ribbon Framework by default uses a font that is not the user's preference. Additionally, the user could have specified their font preference in my application, which i want the Ribbon hosted in my application to honor.

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  • In Windows 7, clicking between file explorer windows does not generate window events. What's up?

    - by asmw
    I have a custom made global hook installed and am monitoring for window messages when file explorer windows are clicked on. The funny thing is that they don't generate any window messages! I click between two file explorer windows and nothing. No VM_CREATE, no VM_ACTIVATE. Nothing. Why is this? Spy++ crashes on my machine so I can't use it but my hook is pretty good and should pick everything up. For some reason these windows just don't function like normal windows in that they don't generate the standard window messages when they become active. It seems windows 7 does not see them as normal windows? what's going on?

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  • How can I make one child window draw over another within the same form?

    - by Colen
    Let's say I have ten child windows within a form. How do I make sure one of those windows is drawn over all the others? For example, how do I make sure that window 6 always overdraws windows 1-5 and 7-10? I don't want the window to be drawn over everything else on the screen, just everything else within that form. I've already tried using HWND_TOPMOST and HWND_TOP (see http://stackoverflow.com/questions/2823700/how-can-i-make-a-child-window-topmost ) but it didn't work. :(

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  • Adding a transparent bitmap to a windows button

    - by cmaughan
    It's a while since I've done this, but I'm trying to add a custom button graphic to a windows button, with some transparent areas. I've tried various schemes but can't seem to get the transparent areas to show. Here's my code: hbmpUpDisabled = LoadImage(instance,MAKEINTRESOURCE(IDB_UPARROWDISABLED), IMAGE_BITMAP, 0, 0, LR_DEFAULTSIZE | LR_LOADTRANSPARENT | LR_LOADMAP3DCOLORS ); SendMessage(GetDlgItem(hWndDlg, IDC_MOVEUP),BM_SETIMAGE,(WPARAM)IMAGE_BITMAP,(LPARAM)hbmpUpDisabled); Does anyone notice any problems here? It works if my bitmap is a 1-bit bitmap. I couldn't get a 32 bit bitmap to work, and I'm not sure how to setup a 24 bit or 8 bit bitmap to do it.... I tried a custom 255,0,255 color (which IIRC is a default transparent value), but so far no joy....

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  • How can I keep an event from being delivered to the GUI until my code finished running?

    - by Frerich Raabe
    I installed a global mouse hook function like this: mouseEventHook = ::SetWindowsHookEx( WH_MOUSE_LL, mouseEventHookFn, thisModule, 0 ); The hook function looks like this: RESULT CALLBACK mouseEventHookFn( int code, WPARAM wParam, LPARAM lParam ) { if ( code == HC_ACTION ) { PMSLLHOOKSTRUCT mi = (PMSLLHOOKSTRUCT)lParam; // .. do interesting stuff .. } return ::CallNextHookEx( mouseEventHook, code, wParam, lParam ); } Now, my problem is that I cannot control how long the 'do interesting stuff' part takes exactly. In particular, it might take longer than the LowLevelHooksTimeout defined in the Windows registry. This means that, at least on Windows XP, the system no longer delivers mouse events to my hook function. I'd like to avoid this, but at the same time I need the 'do interesting stuff' part to happen before the target GUI receives the event. I attempted to solve this by doing the 'interesting stuff' work in a separate thread so that the mouseEventHookFn above can post a message to the worker thread and then do a return 1; immediately (which ends the hook function but avoids that the event is handed to the GUI). The idea was that the worker thread, when finished, performs the CallNextHookEx call itself. However, this causes a crash inside of CallNextHookEx (in fact, the crash occurs inside an internal function called PhkNextValid. I assume it's not safe to call CallNextHookEx from outside a hook function, is this true? If so, does anybody else know how I can run code (which needs to interact with the GUI thread of an application) before the GUI receives the event and avoid that my hook function blocks too long?

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  • Any way to make dialogs appear/disappear with a transition in MFC?

    - by John
    For instance I have a main dialog, when I click a button a smaller dialog appears next to it. But it would be neat if the small one could somehow transition in, rather than simply appear. For instance using transparency, or zooming in, or sliding in from width=0 - full-width. Making an actual dialog do such things isn't too hard, but what about the controls within it? How might we approach this in a way that is reusable on different dialogs?

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  • Does a modeless dialog processes WM_DESTROY Message?

    - by Dave17
    I'm trying to create a modeless dialog as the main window of a program but it doesn't seem to respond WM_DESTROY or WM_NCDESTROY Message. HWND hwnd=CreateDialogParamA(hInst,MAKEINTRESOURCE(IDD_DIALOG1),0,DialogProc,LPARAM(this)); if (!hwnd) { MessageBox(0, "Failed to create wnd", 0, 0); return NULL; } ShowWindow(hwnd,nCmd); UpdateWindow(hwnd); while (GetMessage (&msg, NULL, 0, 0) > 0) { if (!IsWindow(hwnd) || !IsDialogMessage(hwnd,&msg)) { TranslateMessage (&msg) ; DispatchMessage (&msg) ; } } Modeless Style format from Resource file STYLE DS_SETFONT | DS_FIXEDSYS | WS_MINIMIZEBOX | WS_MAXIMIZEBOX | WS_POPUP | WS_VISIBLE | WS_CAPTION | WS_SYSMENU

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  • How to use Mozilla ActiveX Control without registry

    - by Andrew McKinlay
    I've been using the IE Browser component that is part of Windows. But I'm running into problems with security settings. For example, users get security warnings on pages with Javascript. So I'm looking at using the Mozilla ActiveX control instead. It's especially nice because it has a compatible interface. It works well if I let it install the control in the registry. But my users don't always have administrator rights to install things in the registry. So I'm trying to figure out how to use the control without registry changes. I'm using DllGetClassObject to get the class factory (IID_ICLASSFACTORY) and then CoRegisterClassObject to register it. All the API calls appear to succeed. And when I create an AtlAxWin window with the CLSID, it also appears to work. But when I try to call Navigate on the AtlAxGetControl it doesn't work - the interface doesn't have Navigate. I would show the code but it's in an obscure language (Suneido) so it wouldn't mean much. An example in C or C++ would be easy for me to translate. Or an example in another dynamic language like Python or Ruby might be helpful. Obviously I'm doing something wrong. Maybe I'm passing the wrong thing to CoRegisterClassObject? The MSDN documentation isn't very clear on what to pass and I haven't found any good examples. Or if there is another approach, I'm ok with that too. Note: I'm using the AtlAxWin window class so I'm not directly creating the control and can't use this approach. Another option is registry free com with a manifest. But again, I couldn't find a good example, especially since I'm not using Visual Studio. I tried to use the MT manifest tool, but couldn't figure it out. I don't think I can use DLL redirection since that doesn't get around the registry issue AFAIK. Another possibility is using WebKit but it seems even harder to use.

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  • keybd_event is not working right =(

    - by user302131
    I can't get this to work right. This should press left for 1 second then wait 10 seconds, then right 1 second, etc.: keybd_event(0x25, 0xCB, 0, 0); // press left cout << "Ldown\n"; // so i know it worked Sleep(1000); // hold it for 1sec keybd_event(0x25, 0xCB, KEYEVENTF_KEYUP, 0);// let go of the key cout << "Lup\n"; // so i know i let go Sleep(10000); // Sleep for 10secs keybd_event(0x27, 0xCD, 0, 0); // press right cout << "Rdown\n"; // so i know i pressed right Sleep(1000); // sleep 1sec keybd_event(0x27, 0xCD, KEYEVENTF_KEYUP, 0);// let go of the key cout << "Rdown\n"; // so i know i let go. This is in a loop but it wont do anything :( Unless I close the program before the key is let go, then it will just keep the key down until I press the key again. I know you can use only one key code if you want but I need to use both. So what am I missing?

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  • What Windows message is fired for mouse-up with modifier keys?

    - by Greg
    My WndProc isn't seeing mouse-up notifications when I click with a modifier key (shift or control) pressed. I see them without the modifier key, and I see mouse-down notifications with the modifier keys. I'm using the Windows Forms NativeWindow wrapper to get Windows messages from the WndProc() method. I've tried tracking the notifications I do get, and I the only clue I see is WM_CAPTURECHANGED. I've tried calling SetCapture when I receive the WM_LBUTTONDOWN message, but it doesn't help. Without modifier (skipping paint, timer and NCHITTEST messages): WM_LBUTTONDOWN WM_SETCURSOR WM_MOUSEMOVE WM_SETCURSOR WM_LBUTTONUP With modifier (skipping paint, timer and NCHITTEST messages): WM_KEYDOWN WM_PARENTNOTIFY WM_MOUSEACTIVATE WM_MOUSEACTIVATE WM_SETCURSOR WM_LBUTTONDOWN WM_SETCURSOR (repeats) WM_KEYDOWN (repeats) WM_KEYUP If I hold the mouse button down for a long time, I can usually get a WM_LBUTTONUP notification, but it should be possible to make it more responsive.. What am I missing? Thanks.

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  • Issues with simulating cell selection in Excel using PostMessage

    - by DD
    Hi all, So far I've tried drag/drop motion in many applications including Visualization software (moving time slider left/right), Photoshop-Paint (drawing) etc. I need some more testing before I make sure that my system works and it failed in Excel. I'm using the code below to send the input: m.x = 215; m.y = 200 + 36 + 9 * ( currentTime - 1 ); childH = findChild( w->getHandle(), m ); PostMessage( childH, WM_MOUSEMOVE, 0, MAKELPARAM( m.x, m.y ) ); PostMessage( childH, WM_LBUTTONDOWN, MK_LBUTTON, MAKELPARAM( m.x, m.y ) ); m.x = 215; m.y = 200 + 36 + 9 * ( currentTime ); childH = findChild( w->getHandle(), m ); PostMessage( childH, WM_MOUSEMOVE, MK_LBUTTON, MAKELPARAM( m.x, m.y ) ); PostMessage( childH, WM_LBUTTONUP, 0, MAKELPARAM( m.x, m.y ) ); I can click anywhere in Excel and select the cell, or activate buttons/menus anything. I can even drag a plot around (with the code above) but it doesn't work for clicking and dragging the mouse to select multiple cells. It just doesn't do anything. I can't use SendInput because the window doesn't have the focus and is in background. Thanks!

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  • How to make WPF app work as a child process in Citrix

    - by RichardOD
    I am working on a 3rd party application that allows plugins to be written in .NET 1.1. I have decided I would like to write my plugin in a seperate process that is called from the .NET 1.1 application (achieved using Process.Start). This is fine- I create a new process that is a WPF app. When I launch this through MSTSC everything works as expected, however when I run the app through Citrix, the WPF child app fails to render correctly, and the mouse position starts going crazy- the child process window is basically not usable. Is there a way to avoid this happening? If I create a seperate WPF application and deploy this through Citrix everything works fine. If I create a child Windows forms app in .NET 3.5, that also works fine.

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  • Is it safe to catch EXCEPTION_GUARD_PAGE

    - by Michael J
    Environment is VC++ 9 on various Win platforms (XP and later) I'm writing an unhandled exception handler. I have a vague recollection from my kernel days that it was bad to catch an EXCEPTION_GUARD_PAGE, as this was generated to tell the OS to enlarge the stack. My question is twofold: Can such an exception occur in user space? If so, is it safe to catch it? I'm not especially interested in doing anything with it. I just want to know if I need to put special code in to not catch it (as I'm catching everything at the moment).

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  • Howcome some C++ functions with unspecified linkage build with C linkage?

    - by christoffer
    This is something that makes me fairly perplexed. I have a C++ file that implements a set of functions, and a header file that defines prototypes for them. When building with Visual Studio or MingW-gcc, I get linking errors on two of the functions, and adding an 'extern "C"' qualifier resolved the error. How is this possible? Header file, "some_header.h": // Definition of struct DEMO_GLOBAL_DATA omitted DWORD WINAPI ThreadFunction(LPVOID lpData); void WriteLogString(void *pUserData, const char *pString, unsigned long nStringLen); void CheckValid(DEMO_GLOBAL_DATA *pData); int HandleStart(DEMO_GLOBAL_DATA * pDAta, TCHAR * pLogFileName); void HandleEnd(DEMO_GLOBAL_DATA *pData); C++ file, "some_implementation.cpp" #include "some_header.h" DWORD WINAPI ThreadFunction(LPVOID lpData) { /* omitted */ } void WriteLogString(void *pUserData, const char *pString, unsigned long nStringLen) { /* omitted */ } void CheckValid(DEMO_GLOBAL_DATA *pData) { /* omitted */ } int HandleStart(DEMO_GLOBAL_DATA * pDAta, TCHAR * pLogFileName) { /* omitted */ } void HandleEnd(DEMO_GLOBAL_DATA *pData) { /* omitted */ } The implementations compile without warnings, but when linking with the UI code that calls these, I get a normal error LNK2001: unresolved external symbol "int __cdecl HandleStart(struct _DEMO_GLOBAL_DATA *, wchar_t *) error LNK2001: unresolved external symbol "void __cdecl CheckValid(struct _DEMO_MAIN_GLOBAL_DATA * What really confuses me, now, is that only these two functions (HandleStart and CheckValid) seems to be built with C linkage. Explicitly adding "extern 'C'" declarations for only these two resolved the linking error, and the application builds and runs. Adding "extern 'C'" on some other function, such as HandleEnd, introduces a new linking error, so that one is obviously compiled correctly. The implementation file is never modified in any of this, only the prototypes.

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  • Send Keyboard Input to VMWare from C#

    - by Robert
    Hi. I want to send mouse clicks and keyboards keys to a window running a virtual machine such as VMware or VirtualBox. I want to pilotate it from the host OS, from an application written in C#. I can move and click the mouse. But I can't send keyboard input. I tried with SendKeys but it doesn't work. With every other "normal" window, it works. But I think it's related to how VMware or Virtual BOx intercept keyboard events. Any idea?

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  • How to get spacing between characters printed using TextOut ?

    - by life-warrior
    I'm trying to calcuate size of each cell (containing text like "ff" or "a0"), so that 32 cells will fit into window by width. However, charWidth*2 doesn' represent the width of a cell, since it doesn't take spacing between characters in the account. How can I obtain size of a font so that 32 cells each is two chars like "ff" fit exactly into window's client area ? Curier is fixed-width font. RECT rect; ::GetClientRect( hWnd, &rect ); LONG charWidth = (rect.right-rect.left)/BLOCK_SIZE/2-2; int oldMapMode = ::SetMapMode( hdc, MM_TEXT ); HFONT font = CreateFont( charWidth*2, charWidth, 0, 0, FW_DONTCARE, FALSE, FALSE, FALSE, DEFAULT_CHARSET, OUT_OUTLINE_PRECIS, CLIP_DEFAULT_PRECIS, CLEARTYPE_QUALITY, FF_ROMAN, _T("Courier") ); HGDIOBJ oldFont = ::SelectObject( hdc, font ); for( int i = 0; i < BLOCK_SIZE; ++i ) { CString str; str.Format( _T("%.2x"), (unsigned char)*(g_memAddr+i) ); SIZE size; ::TextOut( hdc, (size.cx+2)*i+1, 1, str, _tcslen((LPCTSTR)str) ); }

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