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Yeah but consider what he wants to do... if he's already using the WinAPI, might as well use the Win timers. Otherwise we'll have to answer a bunch of questions regarding mutexes next [joke ].
modified 25-Oct-11 16:28pm.
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Just use the win 32 set timer method: http://msdn.microsoft.com/en-us/library/windows/desktop/ms644906(v=vs.85).aspx[^]
Dont forget, MFC just wraps the Win32 API, and even then not all of it (there is a lot of rich unctionality there not available in MFC), and pretty much all MFC functions have a function of the same name in the win32API.
Most of these win32 funcs take a window handle as the first param, and thats generally the only difference between them, and their MFC counterpart, since the MFC one generally calls itself.
So for example the win32 MessageBox() func has a HWND as the first partam, then all the rest are the same as MFC.
You can also call the win32API directly form MFC code. Just use the global namespce operator :: before each call ie:
::MessageBox(hWnd, txt, msg, MB_OK);
You can get window handles for other processes/wondows easilly too. FindWindow() returns a HWND. Its params are eityher the class of the window, or its text (in the title bar).
You can use this to send or post messages, such as WM_COMMAND ones to another window.
Like I say, there is a lot you can do outside of MFC. (Window hooks are particularly interesting things. Very very powerfull.)
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Nothing to say.
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Thanks a lot,
As I understand I need to use SetTimer() and to give it an handle to window but
the class is not connected to a dialog so what the hWnd that I need to pass?
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Timers have nothing to do with dialogs, they operate on any Window. The issue of passing a handle to the window is so that the Windows framework knows where to post the WM_TIMER message that gets raised when the timer expires. If you do not have a Window to connect the timer to then SetWaitableTimer()[^] may be able to help you.
Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman
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aangerma wrote: so what the hWnd that I need to pass?
The one to your dialog/app window that handles WM_TIMER.
As suggested you can get this handle with a FindWindow() specifying the title text. Or you can provide it form the fialog itself, I forget the func, something like GetSafeHwnd() or some such, but there is one for a dialog to get its own handle.
Like I say, hunt through the win32 API. You will find what you need there.
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Nothing to say.
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SetTimer[^] has a fourth parameter, an application defined callback function. Use that and set the HWND to NULL.
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He might find that difficult to specify a class member as a call back function. But yes, it is doable (and one of the reasons I prefer C, OK, you need to be a good programmer, but you can do what you want)
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Nothing to say.
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Now why didn't I think of that; good answer.
Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman
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On reflection I decided to test this and it does not work without any windows, as there is nothing to process the WM_TIMER message, which is used by the default handler to invoke the callback routine.
Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman
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I would be interested to see your test code. I have no problems using a timer callback procedure.
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- Full time or Part time
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Looking at it further, the app does not need a window, but if there is no window then the thread needs a message loop.
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PJ Arends wrote: the thread needs a message loop.
That's the issue; even with a callback the timer signals by posting a WM_TIMER message.
Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman
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I have a few apps like that (mostly system services) so at the end of "main()" (or whatever you use), stick code like this:
static MSG msg;
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return(msg.wParam);
It doesn't hurt to sit in this loop while the other threads do their job and it allows them to post WM_CLOSE messages to run-down the process if necessary. Other standard messaging things works, including timers.
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Thanks for the reply,
can you give me more details how to use it?
How can I know which message I Received by msg?
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This is the standard windows message pump, it only causes windows messages to get processed for apps that are not "dialog based". You don't modify this code in any way nor look at the message in that loop. The "dispatch" is done by windows to the proper messsage handler. If you have dialogs, windows does this for you.
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Can you give me exmple how to write a messsage handler ,
I did it only with the class wizard of mfc,
and this is the first time I need to add a timer
to a class that don't connected to any window,
even if I creat a fictive window like dialog box the SetTimer(...)
works only if the dialog is opened by DoModal.
thanks
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I see all kinds of articles and documents on tokens using strtok_s, but none of them show how to get or capture the actual value of a token.
It looks like a token is a pointer, to a place in a char array. but it doesn't seem to give you the length. In the autos, it looks like an array of chars, but I know better now.
char *szServerName[50] = {""};
szServerName = token2;
would be invalid,
I figured out how to step through the source char array in a name value pair
eg. ServerName, DELL760
token1 = ServerName
token2 = DELL760
but I can't figure out how to capture the values. Plus you can't run token1 in a switch, because there is nothing to compare to.
void CA_SQLServer_Scan::_process_SQL_BufferData( std::vector<char> pData, int pLength )
{
int msgLength = pData.size();
char *szWords = new char[msgLength+1];
for (int i = 0; i < msgLength; i++) {
szWords[i] = pData[i];
}
szWords[ pData.size() ] = '\0';
char seps[] = ";";
char *token1, *next_token1, *token2, *next_token2;
char *szServerName[50] = {""};
char *szInstanceName[50] = {""};
char *szClustered[5] = {""};
char *szVersion[25] = {""};
char *szTCP[5] = {""};
char *szNP[80] = {""};
if ( strcmp( szWords, "ServerName" ) !=0 &&
strcmp( szWords, "InstanceName" ) !=0 &&
strcmp( szWords, "Version" ) !=0)
{
token1 = strtok_s( szWords, seps, &next_token1);
token2 = strtok_s( next_token1, seps, &next_token1);
while (token1 != NULL || token2 !=NULL)
{
if ( token1 !=NULL || token2 !=NULL )
{
token1 = strtok_s( next_token1, seps, &next_token2);
token2 = strtok_s( next_token2, seps, &next_token1);
}
}
}
delete [] szWords;
}
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That won't work either since szServerName is defined as an array of pointers.
Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman
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char *szServerName[50] = {""};
szServerName = token2;
would be invalid,
Surely it's invalid. You just need to use strcpy() to copy the value from the token. And compare it with the required value.
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I think there is quite a lot you don't understand unfortunately; this is a bit of a mess.
You need to understand the difference between a char* and a char* [] . You are also using a vector in your function when you are just passing a null-terminated string. Given your array of SQL information you know that it is in pairs of strings <keyword>;<value> so you just need to split the string into it's constituent parts and process each keyword as required. Something like:
void CA_SQLServer_Scan::_process_SQL_BufferData(char* pszData)
{
char *token1, *nextToken, *token2;
char seps[] = ";";
char *szServerName = NULL;
char *szInstanceName = NULL;
char *szVersion = NULL;
token1 = strtok_s(pszData, seps, &nextToken);
do {
token2 = strtok_s(NULL, seps, &nextToken);
if (strcmp(token1, "ServerName") == 0)
szServerName = token2;
else if (strcmp(token1, "InstanceName") == 0)
szInstanceName = token2;
else if (strcmp(token1, "Version") == 0)
szVersion = token2;
if (token2 == NULL)
break;
token1 = strtok_s(NULL, seps, &nextToken);
} while (TRUE);
Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman
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I had my bubble burst last night by another comment on my experimental code.
I tried if token1 == "ServerName", but it always came out false. Didn't think to use strcmp on the value. I tried to do a switch to, Switch (token1) but it wasn't valid.
Well like I said, I'm only 4 weeks into this. I think once I get a clear understanding of working with data in c++, everyone will see better cleaner code from me.
There alot of people from this technology company pushing me toward using vectors for everything, but I do really need to understand the char first.
Thanks in advance, let me soak it in for an hour.
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jkirkerx wrote: I had my bubble burst last night
Sorry to have to do it again, but I am finding it difficult to understand why you are working on this project when your knowledge of C/C++ is at the level it is. You seem to be struggling with some very basic concepts, which are vital to get your program to work. I would agree that using vectors (and other STL classes) would be a good thing but you really need to have a good grasp of the basics first.
Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman
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