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 Wonderful, it works! I'm very grateful for your help. Send me a picture...and I'll make you a statue! How silly, I made a typing mistake writing hKey rather than MyKey in RegOpenKeyEx().
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1 )I am implementing a component that receives an event , which needs to launch an exe
However , I do not want to launch the exe if it is already running .
Is there a way to determinie if the exe is currently running ?
2)Typically there are applications that are launched the first time when an event occurs .
Say Windows media player is launched when i connect my music player
However I would want to understand how these applications get notified when subsequent events ( non-first time events ) occur ? Is there a standard pattern to follow ?
I was thinking, more on the lines of the App ( such as Windows Media player) that acts as a client to a Com Server ( which receives the notifications) , however the non first time notifications would be conveyed via a callback ( registered during initialization of the EXE ) .
Ideas are welcome
Thanks
Engineering is the effort !
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act_x wrote: 2)Typically there are applications that are launched the first time when an event occurs .
Say Windows media player is launched when i connect my music player
However I would want to understand how these applications get notified when subsequent events ( non-first time events ) occur ? Is there a standard pattern to follow ?
WMP has code in it that checks to see if it is already running.
"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman
"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne
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Further to David's comments on the application doing the checking for this, try a search for the term 'single instance' in the articles. Here's two articles that I'd recommend;
1). MFC and C++[^]
2). Managed .Net[^].
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2) When a New Device (like your music player) is plugged in, a Window Message ( WM_DEVICECHANGE ) is sent to all the resident windows... All you need to do is create a resident application with a hidden window...The window will recieve A WM_DEVICECHANGE Message...this is where you detect whether it's a viable device...
There's also a "RegisterDeviceNotification" (though, i'm not familiar with it...)
I'm not sure if this was what you were expecting? Is there any specfic event you want to "listen" to?
modified on Thursday, February 21, 2008 9:35 AM
modified 20-Oct-19 21:02pm.
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I need to modify a few C applications that are about 10 years old and are currently using CMC to send and receive email from Exchange. I tried using Simple MAPI but am encountering the Outlook security prompts, so I am now looking at using Extended MAPI. I have found examples here using C++, but nothing written in C. Microsoft does not seem to offer much in the way of examples and rewriting the applications in C++ is not an option because there are several custom libraries that would also need to be converted. One of the applications is loaded on about 15,000 workstations, so a third party product or a loading a custom dll is not an option either. The only functionality I need is to be able to logon, logoff, send email and read email (in plain text). Any ideas ??
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This doesn't add up. You don't need to rewrite the whole application in C++. You should be able to interface the legacy C code with any C++ changes.
Write a C interface to the C++ code:
#include "NewCppAPI.h"
void legacy_Code()
{
int iResult = NewCppAPI();
}
#ifdef __cplusplus
extern "C" {
#endif
int NewCppAPI();
#ifdef __cplusplus
}
#endif
#include "NewCppAPI.h"
int NewCppAPI()
{
int iResult = 0;
return iResult;
}
I have to guess that there must be some other constraints you are not mentioning.
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further...I would anticipate that you might need to interface to the legacy C code from the C++ code. In the C++ code mark the legacy C headers as C code:
extern int stableAPI(int icount);
extern "C" {
#include "legacycode.h"
}
void CppFunction()
{
std::vector <int> vNumbers;
vNumbers.push(1);
vNumbers.push(2);
vNumbers.push(3);
int iResult = stableAPI(vNumbers.size());
}
When you have to pass information to the legacy code, it can only pass C types; don't pass pointers to C++ types. Be sure you know who owns what memory. A simple solution is to write copy API's in the C++ code that are called by the legacy C code in the same way that windows API's do. You pass in a pointer to a buffer with a pointer to a length that is the size of the buffer. If the buffer is too small the function returns an error and set the length to the size needed:
int CopyCppData(char * pszBuffer, int * ilength);
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Hi,
I am getting error while compling my C++ code when I am using SafeArrayGetElement method in Unix.It is complining successfully in Windows.
Is there any equalent method for SafeArrayGetElement for getting each element from safearray in Unix enviroment?
Thanks in Advance
JK
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AFAIK the aren't SafeArrays at all in UNIX.
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
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Hi all..
I am creating a Log File..I want to use locking and unlocking function...I dnt have idea abt threading..plz give me some idea..
thanking you
sharan
Hi,,
I am sharan.Working as a software Engineer in Indo-Fuji Software Company located in BTM Layout.Bangalore.India.
I have Completed my B.E(COmputers)in 2006.ANd I am having 2 years of Exp in VC++.
thanking you
sharan
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What are you trying to "lock"? Are you trying to prevent simultaneous access to the file?
If so, between separate processes? Threads of the same process?
Mark
Mark Salsbery
Microsoft MVP - Visual C++
![Java | [Coffee]](https://www.codeproject.com/script/Forums/Images/coffee.gif)
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Hi..
I am trying to lock a log file...
I am creating a log file...which will be opened once...
i will write log errors to that....
i want to use locking so that no one else can write to that log file...
Hi,,
I am sharan.Working as a software Engineer in Indo-Fuji Software Company located in BTM Layout.Bangalore.India.
I have Completed my B.E(COmputers)in 2006.ANd I am having 2 years of Exp in VC++.
thanking you
sharan
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Open the file in a share mode that doesn't allow writing (e.g. pass 0 as share
mode parameter to CreateFile()).
Mark
Mark Salsbery
Microsoft MVP - Visual C++
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If you are trying to have a log file that can be read by other apps while you are still running, you can set the sharing permissions (allowing read access) correctly when opening/creating the file.
Note: I believe that some common Windows apps, like Notepad and Wordpad/Write, will try to open file with write/exclusive access, which is why some apps can open a file you are using while Notepad cannot.
I previously had to have a log file that was readily readable. Even though it sounds like a lot of overhead, I ended up opening/writing/closing the file each time I had to log something. Given that I only wrote log events between 1-4 times a second, the overhead (while measurable on the microsecond and clock tick level) was acceptable.
You likely would not want to do that if the log file is remote...
Peace!
-=- James Please rate this message - let me know if I helped or not!<hr></hr>If you think it costs a lot to do it right, just wait until you find out how much it costs to do it wrong!
Remember that Professional Driver on Closed Course does not mean your Dumb Ass on a Public Road!
See DeleteFXPFiles
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sharanu wrote: I dnt have idea abt threading..
Which has what to do with [un]locking a file? 
"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman
"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne
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Hi,
I have a trouble to get the local printer status. I simply want to check whether a printer is connected to my PC or not.
I used the GetPrinter() to retrieve the PRINTER_INFO_2. But the "Status" field always returns 0 whether the printer is connected or not, whether before or after sending the prints.
Can you help me with that? I am using VC++6.0 in WinXP.
Thanks a lot,
Stanley
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Skywalker2008 wrote: But the "Status" field always returns 0
Odd, since none of the PRINTER_STATUS_xxx values resolves to 0. Are you sure that GetPrinter() is returning a non-zero value?
You might also consider using the Win32_Printer WMI class.
"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman
"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne
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Yes, the GetPrinter() returns a non-zero value and the "Status" field is 0 somehow although it is not among any of the defined PRINTER_STATUS_xxx values. Some related posts pointed to the lack of a bidirection communication feature of the printer. I am not sure and need check with the manufacturer.
The Win32_Printer WMI class sounds a great suggestion to me. I will try it since it contains a "PrinterStatus" property.
Thanks for the help!
Stanley
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I must install which Windows Components before I install Visual Stduio 2003?
I insert the CD1 of VS2003, it always tell me to restart computer.
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I don't remember the 2003 install needing any prerequisite installations that
it didn't install itself.
Maybe the .NET framework 1.1? Check the readme.
Mark
Mark Salsbery
Microsoft MVP - Visual C++
![Java | [Coffee]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/coffee.gif)
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Read the senario first in order to understand the problem
I had compile service in order to logon to windows remotely. I am achieving this by opening a reference to winst0 desktop and getting the reference of the login windows and set the username and password.
There are 3 states in which the user name and password can be passed.
1. when the system is at logged out state i.e no user has logged on (my service is working in this state)
2. when the system is at locked out state by pressing ctrl+alt+delete and selecting lock option (my service is working in this state also)
3. when the target system is accessed via RDP, the target computer goes into locked state, this is where is am facing problem.
I cannot get the reference to the locked window.
Can any one please let me know what is the problem and how do i get the problem solved.
here is the code
HWINSTA hWinStaUser = OpenWindowStation("WinSta0", FALSE, MAXIMUM_ALLOWED);<br />
if(SetProcessWindowStation(hWinStaUser))<br />
{<br />
HDESK old_desktop = GetThreadDesktop(GetCurrentThreadId());<br />
if (SelectDesktop("Winlogon"))<br />
{<br />
HWND hwndCtrlAltDel = FindWindow("SAS window class", "SAS window");<br />
if (hwndCtrlAltDel == NULL) {<br />
myfile << "\"SAS window\" not found\n";<br />
hwndCtrlAltDel = HWND_BROADCAST;<br />
}else{<br />
SendMessage(hwndCtrlAltDel, WM_HOTKEY, 0, MAKELONG(MOD_ALT | MOD_CONTROL, VK_DELETE));<br />
}<br />
HWND w=NULL;<br />
<br />
if( NULL != (w=FindWindow(NULL,"Welcome to Windows")) || NULL != (w=FindWindow(NULL,"Computer Locked")) || hwndCtrlAltDel!=NULL )<br />
Sleep(1000);<br />
if(NULL != (w=FindWindow(NULL,"Log On to Windows")) || NULL != (w=FindWindow(NULL,"Unlock Computer")) ){<br />
keybd_event( VK_MENU, 0, 0, NULL );<br />
keybd_event( VkKeyScan('u'), 1, 0, NULL );<br />
keybd_event( VkKeyScan('u'), 1, KEYEVENTF_KEYUP, NULL );<br />
keybd_event( VK_MENU, 0, KEYEVENTF_KEYUP, NULL );<br />
Sleep( 50 );
<br />
char username[] = "Administrator";<br />
for( int c=0; c<strlen(username); c++="" )<br="" mode="hold" />{<br />
keybd_event( VkKeyScan(username[c]), 1, 0, NULL );<br />
keybd_event( VkKeyScan(username[c]), 1, KEYEVENTF_KEYUP, NULL );<br />
}<br />
keybd_event( VK_MENU, 0, 0, NULL );<br />
keybd_event( VkKeyScan('p'), 1, 0, NULL );<br />
keybd_event( VkKeyScan('p'), 1, KEYEVENTF_KEYUP, NULL );<br />
keybd_event( VK_MENU, 0, KEYEVENTF_KEYUP, NULL );<br />
Sleep( 50 );
<br />
char password[] = "admin";<br />
for( int c=0; c<strlen(password); c++="" )<br="" mode="hold" />{<br />
keybd_event( VkKeyScan(password[c]), 1, 0, NULL );<br />
keybd_event( VkKeyScan(password[c]), 1, KEYEVENTF_KEYUP, NULL );<br />
}<br />
<br />
HWND hwndDomain;<br />
int dwIndex;<br />
if(NULL!= (hwndDomain = GetDlgItem(w, 1504)) || NULL!= (hwndDomain = GetDlgItem(w, 1956))){<br />
dwIndex = (DWORD) SendMessage(hwndDomain, CB_FINDSTRINGEXACT, 0, (LPARAM) "DOMAIN1");<br />
}<br />
if (dwIndex != CB_ERR)<br />
{<br />
SendMessage(hwndDomain, CB_SETCURSEL, (WPARAM) dwIndex, 0);<br />
}<br />
keybd_event( VK_RETURN, 0, 0, NULL );<br />
keybd_event( VK_RETURN, KEYEVENTF_KEYUP, 0, NULL );<br />
}<br />
if (old_desktop != NULL)<br />
SelectHDESK(old_desktop);<br />
}<br />
if (hWinStaUser)<br />
CloseWindowStation(hWinStaUser);<br />
}
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It could be that the visible desktop is not the secure (Winlogon) desktop. Have you tried having your service enumerate the available desktops (and even looking for the dialog on a Desktop as it is enumerated)?
It might be that RDP handles (interactive) Desktops differently than the standard winstation because of how Terminal Services works.
Have you also tried getting the Winlogon desktop when no-one is logged in and an RDP session starts? (Just to complete your tests.)
Peace!
-=- James Please rate this message - let me know if I helped or not!<hr></hr>If you think it costs a lot to do it right, just wait until you find out how much it costs to do it wrong!
Remember that Professional Driver on Closed Course does not mean your Dumb Ass on a Public Road!
See DeleteFXPFiles
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Hi James
I had enumerated all the desktops here is the output but was unable to find the window of desktops
11:23:59.203 - Station: WinSta0
11:23:59.203 - Desktop: Default
11:23:59.203 - Window:
11:23:59.203 - Window:
11:23:59.203 - Window:
11:23:59.203 - Window:
11:23:59.203 - Window: Start Menu
11:23:59.203 - Window:
11:23:59.203 - Window:
11:23:59.203 - Window:
11:23:59.203 - Window:
11:23:59.203 - Window:
11:23:59.218 - Window:
11:23:59.218 - Window:
11:23:59.218 - Window: SysFader
11:23:59.218 - Window:
11:23:59.218 - Window:
11:23:59.218 - Window:
11:23:59.218 - Window:
11:23:59.218 - Window:
11:23:59.218 - Window:
11:23:59.218 - Window: CB Monitor Window
11:23:59.218 - Window:
11:23:59.218 - Window:
11:23:59.218 - Window: Local Disk (C
11:23:59.218 - Window:
11:23:59.218 - Window:
11:23:59.218 - Window: Services
11:23:59.218 - Window:
11:23:59.234 - Window: Command Prompt
11:23:59.234 - Window:
11:23:59.234 - Window: AXWIN Frame Window
11:23:59.234 - Window: Windows Task Manager
11:23:59.234 - Window:
11:23:59.234 - Window:
11:23:59.234 - Window:
11:23:59.234 - Window:
11:23:59.234 - Window:
11:23:59.234 - Window:
11:23:59.234 - Window: MS_WebcheckMonitor
11:23:59.234 - Window: C:\Perl\bin\perl.exe
11:23:59.234 - Window: VMDnDControlTitle
11:23:59.234 - Window:
11:23:59.234 - Window:
11:23:59.234 - Window:
11:23:59.234 - Window:
11:23:59.234 - Window:
11:23:59.234 - Window: KmlogonMessage
11:23:59.234 - Window: C:\WINDOWS\system32\java.exe
11:23:59.234 - Window: C:\WINDOWS\system32\java.exe
11:23:59.234 - Window: Connections Tray
11:23:59.234 - Window: Power Meter
11:23:59.234 - Window:
11:23:59.234 - Window: Program Manager
11:23:59.234 - Desktop: Disconnect
11:23:59.234 - EnumWindows failure(183)
11:23:59.234 - Desktop: Winlogon
11:23:59.234 - Window: MCI command handling window
11:23:59.234 - Window: Winlogon generic control dialog
11:23:59.234 - Window: MuDisconnect
11:23:59.234 - Window: MuStationLogo
11:23:59.234 - Window: KmlogonMessage
11:23:59.250 - Window: SAS window
11:23:59.250 -
11:23:59.265 - Station: Service-0x0-3e7$
11:23:59.265 - OpenWindowStation failure(5)
11:23:59.265 -
11:23:59.265 - Station: Service-0x0-3e4$
11:23:59.265 - OpenWindowStation failure(5)
11:23:59.281 -
11:23:59.281 - Station: Service-0x0-3e5$
11:23:59.296 - OpenWindowStation failure(5)
11:23:59.296 -
11:23:59.296 - Station: SAWinSta
11:23:59.296 - Desktop: SADesktop
11:23:59.296 - OpenDesktop failure(2)
11:24:09.296 -
I am able to get the reference of Winsta0 while the pc is in the RDP state and perform operations on it. All this takes effect in the background only.
Abdul khaliq
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Hello,
I've downloaded an SDK an am able to get the code to compile with VC6 no problem but
when I use Express Edition 2008/2005 I get all sorts of compiler/linker errors. The
problem is I only have access to VC6 in work and would like to have a copy for myself.
Is it still available? or is there a way to get the Express Editions to use the VC6
compiler? Searching for this hasn't turned up anything
Also: Why would something compile with older versions and not newer ones?
Thanks
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