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fopen failes GBlank22-Jul-02 20:41 GBlank 22-Jul-02 20:41  Does anyone knows , why sometimes fopen failes , but GetLastError returns 0. And which is more interesting , is although fopen fails , the file actually has been created.? Thanks. Re: fopen failes Stuart Dootson22-Jul-02 20:51 Stuart Dootson 22-Jul-02 20:51  I don't think fopen sets the last error code on failure - GetLastError is a Win32 thing, whereas fopen is part of the C run-time library. Don't know why the second bit should happen - it always helps to look at the source for the library (although you may not have it installed). Stuart Dootson 'Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p' Re: fopen failes Alexandru Savescu22-Jul-02 21:45 Alexandru Savescu 22-Jul-02 21:45  Try to use CreateFile and then GetLastError. Best regards, Alexandru Savescu Control detection vikramlinux22-Jul-02 20:03 vikramlinux 22-Jul-02 20:03  I want list the windows controls in a selection region. Is it possible? How? Here I am going to draw a rectangle in any region of window. VIKS Re: Control detection Aggtaa23-Jul-02 1:32 Aggtaa 23-Jul-02 1:32  Yep. No problem Just 1st) enumerate all windows in system (EnumWindows, or, much eaier in case of ONE target window - EnumChildWindows) 2st) determine if they do have target window (one, or did i mis anything?) like BOOL CALLBACK EnumChildProc(HWND hWnd, LPARAM lParam) { CMyDlg *pDlg = (CMyDlg*)(AfxGetApp()->m_pMainWnd); HWND hTempWnd = hWnd; while (hTempWnd != NULL && pDlg->IsTargetWnd(hTempWnd )) hTempWnd = ::GetParentWnd(hTempWnd ); if (hTempWnd == NULL) return TRUE; ... } 3rd) get their rects with GetWindowRet, 4th) if needed convert them into client coordinates (ClientToScreen & back ScreenToClient) 5th) check if they lay inside traget rect with (IntersectRect and some additional work in case of target rect lays fully inside some controls) 6th) that all falks, like MGM said Cryst How to send message to another program? RichardWdy22-Jul-02 19:20 RichardWdy 22-Jul-02 19:20  I wnat to run another prog. in my prog. So I need seng messare to the prog. I have two questions: 1.What's wrong with the following code and How to send message to a check ctrl? HWND hEditFilter = GetDlgItem(g_hExefile, ID_CHECK_EDIT); // return NULL??? // g_hExefile is the handle of another prog's dialog. PostMessage(g_hExefile, BM_SETCHECK, ID_CHECK_EDIT, 0); // no respond // I want to set the check ctrl in FALSE state. 2.How to send message to a commom dialog(like OK button)? Thanks. No pains, no gains. Re: How to send message to another program? Williams23-Jul-02 4:49 Williams 23-Jul-02 4:49  Heare are the steps and code to send messages to another program. 1. Remember that on Windows all are windows, so you need to get a HWND to your target window. 2. With the target HWND you call GetDlgItem to retrieve a handlw to window control. 3. Send the message to the window´s control directly. code: // buffer to get the target caption window returned by // GetWindowText char szWindowName[60]; CString szTargetWindowName = "MyApp"; // Target window int nFound; int nLength = strlen(szTargetWindowName); HWND hSearchHandle; //Search around our "MyApp" for(hSearchHandle=::GetWindow(::GetDesktopWindow(),GW_CHILD);hSearchHandle; hSearchHandle = ::GetWindow(hSearchHandle, GW_HWNDNEXT)) { ::GetWindowText(hSearchHandle, szWindowName, 20); szWindowName[nLength] = '\0'; nFound = lstrcmpi(szWindowName,szTargetWindowName); if(nFound == 0) { CWnd pCwnd; // WPARAM 1: Check, 0: uncheck ::SendMessage(::GetDlgItem(hSearchHandle,<put heare="" your="" control="" id="">, BM_SETCHECK,1,0); } } if you have any problem with the code above contact me . Asta la vista. Re: How to send message to another program? RichardWdy23-Jul-02 5:38 RichardWdy 23-Jul-02 5:38  Thanks for giving me help. I think the code may has some problem.(I didn't test it yet.) I want to send BM_SETCHECK message to an edit(ID = ID_EDIT_START) and your code showed that you send BM_SETCHECK message to main window. It won't work. So I need to get the edit control's handle (It's where my problem really exists, I can't get the handle). By the way, the external dialog program has several edit controls. Thanks again. Richard Woo No pains, no gains. Re: How to send message to another program? RichardWdy23-Jul-02 5:52 RichardWdy 23-Jul-02 5:52  I made a mistake with the former reply. I tried this: ::SendMessage(::GetDlgItem(hSearchHandle, ID_EDIT_START), BM_SETCHECK, 1, 0); No response at all. I have solved it in another way. My question has a little change. How to get a special edit control in a dialog program's handle? Could you help me? Thanks a lot. Richard Woo No pains, no gains. Re: How to send message to another program? Williams23-Jul-02 6:47 Williams 23-Jul-02 6:47  Hi, BM_SETCHECK works only to checkbox buttons!! Talk more about your last question! Re: How to send message to another program? RichardWdy23-Jul-02 18:06 RichardWdy 23-Jul-02 18:06  Thank you. I want to run another dialog program. It has several edit controls. I want to fill the edit controls automatically, which requests send message to the edit control. I tried several ways, but I couldn't the handle of the edit control. The following is my code. HWND h = ::GetDlgItem(hDlg, ID_EDIT_START); // hDlg is the handle of the dialog. h return NULL. Could you tell me what's wrong? How can I perform that? Richard Woo No pains, no gains. Re: How to send message to another program? RichardWdy23-Jul-02 18:06 RichardWdy 23-Jul-02 18:06  Thank you. I want to run another dialog program. It has several edit controls. I want to fill the edit controls automatically, which requests send message to the edit control. I tried several ways, but I couldn't get the handle of the edit control. The following is my code. HWND h = ::GetDlgItem(hDlg, ID_EDIT_START); // hDlg is the handle of the dialog. h return NULL. Could you tell me what's wrong? How can I perform that? Richard Woo No pains, no gains. Re: How to send message to another program? Williams24-Jul-02 3:13 Williams 24-Jul-02 3:13  Hello, How you get the handle to dialog? did you use the GetWindow methode described in the firts posts? To get the handle to another app(eg your another dialog app) you have to search for window´s caption and compare with your target window´s caption. Once you have the window´s handle you can call GetDlgItem to retrieve a handle to dialog items. I can send you two tests apps that explain it better. Re: How to send message to another program? RichardWdy24-Jul-02 3:32 RichardWdy 24-Jul-02 3:32  I can get the handle of the dialog and the ID of the edit control. But the edit control only has ID, not caption. I do use GetWindow() to enumerate the desktop windows. It's a good way that can replace FindWindow function. My problem is I don't know how to use ID of the control to get the handle. I tried several functions, as GetDlgItem, GetDlgCtlID,... Could you give me further information? Thanks a lot. Richard Woo No pains, no gains. Re: How to send message to another program? Williams24-Jul-02 3:40 Williams 24-Jul-02 3:40  Send me your two tests dialog apps. Re: How to send message to another program? RichardWdy24-Jul-02 4:21 RichardWdy 24-Jul-02 4:21  I send you 2 apps. Plx check. Thanks a lot. No pains, no gains. Re: How to send message to another program? Williams24-Jul-02 4:48 Williams 24-Jul-02 4:48  you say its ok? I dont understand what do you want. whats is wrong so!? Re: How to send message to another program? RichardWdy24-Jul-02 4:57 RichardWdy 24-Jul-02 4:57  I don't know why it works! Just before I sent you the 2 apps, it showed "Not Found". HWND g_FindSpecialControl(LPCSTR lpWndCap, int nIDDlgItem) { HWND hWnd; int nID; hWnd = FindWindow(NULL, lpWndCap); if (hWnd == NULL) return NULL; hWnd = GetWindow(hWnd, GW_CHILD); while (hWnd != NULL) { hWnd = GetWindow(hWnd, GW_HWNDNEXT); nID = GetDlgCtrlID(hWnd); if (nID == nIDDlgItem) return hWnd; } return NULL; } It's strange! No pains, no gains. Re: How to send message to another program? Williams24-Jul-02 5:10 Williams 24-Jul-02 5:10  Its really very strange, I didn´t no changes but the path to test dialog.Now I think that there is nothing more to do! Re: How to send message to another program? RichardWdy24-Jul-02 5:46 RichardWdy 24-Jul-02 5:46  Sorry about my troubling you. I have to send my whole project to you. Plx take some time to help me. Thanks. Richard Woo No pains, no gains. Re: How to send message to another program? Williams24-Jul-02 7:00 Williams 24-Jul-02 7:00  Ok. I will try. Re: How to send message to another program? RichardWdy24-Jul-02 17:10 RichardWdy 24-Jul-02 17:10  Have you received my email with the 2 programs? No pains, no gains. Re: How to send message to another program? Williams25-Jul-02 2:25 Williams 25-Jul-02 2:25  No. try again. Re: How to send message to another program? RichardWdy25-Jul-02 18:58 RichardWdy 25-Jul-02 18:58  Hi, I tried another way and it did work! I used EnumChildWindows function to enumerate all child windows of the dialog and I could get the handle of the edit control through a callback function. Thanks for help. Richard Woo No pains, no gains. Re: How to send message to another program? Williams26-Jul-02 3:54 Williams 26-Jul-02 3:54  Congratulations! Glad to know you!

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