C / C++ / MFC

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Re: How can I get the handle of the dialog ? Saurabh.Garg8-Jul-08 1:54 Saurabh.Garg 8-Jul-08 1:54  Nope this doesnt work. GetDlgItem either works in the CDialog derived classes, in that case you can simply use m_hWnd, or it expectes two parameters and first is HWND of the the dialog. -Saurabh Re: How can I get the handle of the dialog ? pallaka8-Jul-08 2:00 pallaka 8-Jul-08 2:00  Hi, But if u give the HWND as NULL by default as first parameter it will take the default Dialog handel. And once the function executes u will get the Dialog handel, as it returns the handel of the window. Re: How can I get the handle of the dialog ? CPallini8-Jul-08 2:13 CPallini 8-Jul-08 2:13  pallaka wrote: But if u give the HWND as NULL by default as first parameter it will take the default Dialog handel. What is the 'default dialog handle'? If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile. This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong. -- Iain Clarke [My articles] Re: How can I get the handle of the dialog ? pallaka8-Jul-08 2:15 pallaka 8-Jul-08 2:15  You just pass Hwnd = NULL as parameter. The return value will be your dialog handel. try it will work for sure. Re: How can I get the handle of the dialog ? Saurabh.Garg8-Jul-08 2:23 Saurabh.Garg 8-Jul-08 2:23  I just tried this and I get NULL pointer on return. I also checked MSDN and it doesn't say anything about first parameter being NULL. In fact it specifically says: "If the function fails, the return value is NULL, indicating an invalid dialog box handle or a nonexistent control." I take that as input dialog boc handle must be valid. Can you share you source of information? -Saurabh Edit1: I checked GetLastError after calling GetDlgItem(NULL, IDD_MYDIALOG) and it says Invalid Window Handle. Edit2: Okay just saw that you modified your original post to include MSDN documentation. Re: How can I get the handle of the dialog ? Mark Salsbery8-Jul-08 6:39 Mark Salsbery 8-Jul-08 6:39  an important concept to know in MFC is that window creation and destruction are TWO STEP PROCESSES.... 1) the C++ object - a CWnd or derived object 2) the operating system object - an HWND You have only created item 1 Mark Mark Salsbery Microsoft MVP - Visual C++ setting config in win 32 pgm ................ srikanthyenuganti8-Jul-08 1:05 srikanthyenuganti 8-Jul-08 1:05  Q)the question is my program run without error but it does not display the output i need to change the setting options in project can any one tell where to change it my program is a simple win 32 pgm #include<windows.h> #include"resource.h" LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM); int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nShowCmd) { WNDCLASS wc; MSG msg; HWND hMainWnd; if(hPrevInstance!=0) { wc.cbClsExtra=0; wc.cbWndExtra=0; wc.hInstance=hInstance; wc.lpfnWndProc=WndProc; wc.style=CS_HREDRAW|CS_VREDRAW; wc.hCursor=LoadCursor(hInstance,MAKEINTRESOURCE(IDC_MYCURSOR)); wc.hIcon=LoadIcon(hInstance,MAKEINTRESOURCE(IDI_MYICON)); wc.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH); wc.lpszClassName="WindowClass"; wc.lpszMenuName=NULL; } RegisterClass(&wc); hMainWnd=CreateWindow("WindowClass","MyfirstWindowsPgm",0,0,0,300,300,NULL,NULL,hInstance,0); ShowWindow(hMainWnd,nShowCmd); UpdateWindow(hMainWnd); while(GetMessage(&msg,NULL,0,0)) { TranslateMessage(&msg); DispatchMessage(&msg); } return msg.wParam; } LRESULT CALLBACK WndProc(HWND hMainWnd,UINT message,WPARAM wParam,LPARAM lParam) { switch(message) { case WM_CREATE: MessageBox(hMainWnd,"Window created","WM_CREATED",MB_OK); break; case WM_DESTROY: MessageBox(hMainWnd,"Window Destroyed","WM_DESTROYED",MB_OKCANCEL); PostQuitMessage(0); break; case WM_LBUTTONDOWN: MessageBox(hMainWnd,"left mouse button clicked","WM_LBUTTONDOWN",MB_OK); break; default: return(DefWindowProc(hMainWnd,message,wParam,lParam)); } return 0; } Thanks and Regrads From Srikanth.Y Re: setting config in win 32 pgm ................ Saurabh.Garg8-Jul-08 1:30 Saurabh.Garg 8-Jul-08 1:30  srikanthyenuganti wrote: if(hPrevInstance!=0) Why are you doing this? Remove this check and application will work fine. -Saurabh Re: setting config in win 32 pgm ................ srikanthyenuganti10-Jul-08 2:00 srikanthyenuganti 10-Jul-08 2:00  thank u Thanks and Regrads From Srikanth.Y Re: setting config in win 32 pgm ................ Saurabh.Garg10-Jul-08 3:20 Saurabh.Garg 10-Jul-08 3:20  You are welcome. -Saurabh Re: setting config in win 32 pgm ................ SandipG 8-Jul-08 2:39 SandipG 8-Jul-08 2:39  hPrevInstance parameter is kept just for compatibility with Win16 (16 bit) programs. It will always be NULL for win32 applications. Regards, Sandip. can any one slove this problem ............ srikanthyenuganti8-Jul-08 1:03 srikanthyenuganti 8-Jul-08 1:03  Q)the question is my program run without error but it does not display the output i need to change the setting options in project can any one tell where to change it my program is a simple win 32 pgm #include<windows.h> #include"resource.h" LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM); int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nShowCmd) { WNDCLASS wc; MSG msg; HWND hMainWnd; if(hPrevInstance!=0) { wc.cbClsExtra=0; wc.cbWndExtra=0; wc.hInstance=hInstance; wc.lpfnWndProc=WndProc; wc.style=CS_HREDRAW|CS_VREDRAW; wc.hCursor=LoadCursor(hInstance,MAKEINTRESOURCE(IDC_MYCURSOR)); wc.hIcon=LoadIcon(hInstance,MAKEINTRESOURCE(IDI_MYICON)); wc.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH); wc.lpszClassName="WindowClass"; wc.lpszMenuName=NULL; } RegisterClass(&wc); hMainWnd=CreateWindow("WindowClass","MyfirstWindowsPgm",0,0,0,300,300,NULL,NULL,hInstance,0); ShowWindow(hMainWnd,nShowCmd); UpdateWindow(hMainWnd); while(GetMessage(&msg,NULL,0,0)) { TranslateMessage(&msg); DispatchMessage(&msg); } return msg.wParam; } LRESULT CALLBACK WndProc(HWND hMainWnd,UINT message,WPARAM wParam,LPARAM lParam) { switch(message) { case WM_CREATE: MessageBox(hMainWnd,"Window created","WM_CREATED",MB_OK); break; case WM_DESTROY: MessageBox(hMainWnd,"Window Destroyed","WM_DESTROYED",MB_OKCANCEL); PostQuitMessage(0); break; case WM_LBUTTONDOWN: MessageBox(hMainWnd,"left mouse button clicked","WM_LBUTTONDOWN",MB_OK); break; default: return(DefWindowProc(hMainWnd,message,wParam,lParam)); } return 0; } Thanks and Regrads From Srikanth.Y Re: can any one slove this problem ............ Yajnesh Narayan Behera8-Jul-08 3:18 Yajnesh Narayan Behera 8-Jul-08 3:18  Instead of RegisterClass use RegisterClassEx API. Also intialize wcex.cbSize = sizeof(WNDCLASSEX); There is no need to change any settings if you are using the wizard. Re: can any one slove this problem ............ srikanthyenuganti10-Jul-08 1:59 srikanthyenuganti 10-Jul-08 1:59  the code runned well when i removed if(!PrevInstance) Thanks and Regrads From Srikanth.Y Inter-Thread Communication Daniel Kanev7-Jul-08 23:58 Daniel Kanev 7-Jul-08 23:58  How can I send messages from one thread to another? I want to avoid busy/wait loops. Thank you. modified 7-Mar-17 16:41pm. Re: Inter-Thread Communication CPallini8-Jul-08 0:11 CPallini 8-Jul-08 0:11  If a thread has a message queue (for instance GUI threads have it) then you know how to do it. As for worker threads this page [^] may help. If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile. This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong. -- Iain Clarke [My articles] Re: Inter-Thread Communication killabyte8-Jul-08 0:14 killabyte 8-Jul-08 0:14  I would use pipes http://msdn.microsoft.com/en-us/library/aa365781(VS.85).aspx[^] Re: Inter-Thread Communication killabyte8-Jul-08 13:16 killabyte 8-Jul-08 13:16  wow 2 votes of 1 .... i guess i fail any reason why this isn't a good messaging scheme? Re: Inter-Thread Communication Iain Clarke, Warrior Programmer9-Jul-08 0:09 Iain Clarke, Warrior Programmer 9-Jul-08 0:09  I've only just seen your post, so I'm not one of the 2 1's, but pipes are a heavy duty solution that's too cumbersome most of the time. I've used them myself between processes - the idea was that one of my processes might not even be on the same PC, so they give good flexibility. But between two threads in the same the same process, I think they're over the top. Especially for worker->ui thread communications. PostMessage works a treat, and fits nicely into the MFC message loop handling. For pipes, you'd need to alter the message pump to wait for events (you have overlapped I/O I hope!) and messages. For ui->worker thread communications, pipes are more appropriate - especially if it's opened in message mode. Iain. Plz sir... CPallini CPallini abuz drugz, plz plz help urgent. Re: Inter-Thread Communication killabyte9-Jul-08 2:45 killabyte 9-Jul-08 2:45  Hmm u raise a good point, PostMessage() or PostThreadMessage() probably more applicable in this case. thinking back to when i have used pipes i have been shooting off messages then a chunk of data. i will admit i like pulling out the nail gun even if i only have to put in one nail Re: Inter-Thread Communication Cedric Moonen8-Jul-08 0:40 Cedric Moonen 8-Jul-08 0:40  As a remark, it's also usefull to know that you can access the variables directly (providing you have a way to access them) from within the different threads. Cédric Moonen Software developer Charting control [v1.4] OpenGL game tutorial in C++ [New] display source code while debugging George_George7-Jul-08 23:56 George_George 7-Jul-08 23:56  Hello everyone, I have correctly set the source path in Windbg. After setting a breakpoint, how to display the related source files so that I can use them as the similar approach in Visual Studio 2008, e.g. using F10 to step next, using F11 to step in something like this. I have tried ls command in WinDbg, but failed, error message is "No current source file". thanks in advance, George Re: display source code while debugging Stephen Hewitt8-Jul-08 15:01 Stephen Hewitt 8-Jul-08 15:01  Has the program you're debugging has symbol files (.PDB files)? Steve Re: display source code while debugging George_George8-Jul-08 15:44 George_George 8-Jul-08 15:44  Sure, Stephen! I have setup the symbol path. My purpose is to find some "cool and lazy" way which could type a command in command window, and related source file is displayed, currently I have to use File --> Open Source File to open the related source file. I set the source path by File --> Source Code Path, then input the path of the directory which contains the source codes. Is this correct way to setup source path? Do I need to do anything else in order to setup source path, e.g. reload something? regards, George Writing to Registry V K 27-Jul-08 23:01 V K 2 7-Jul-08 23:01  Hi, My application writes into a particular location in Registry Eg. RegOpenKeyEx(HKEY_LOCAL_MACHINE, "Software\\Microsoft\\Windows\\CurrentVersion\\Run", 0, KEY_ALL_ACCESS, &h_Key); //Open a particular registry key //Write to that registry key. I need to restrict this activity to only Administrator.. Can I have a code snippet which allows this only for Administrator. Thanks. Venkat

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