C / C++ / MFC Discussion Boards

Re: Re-Mssql question

MsmVc21-Dec-09 21:56

MsmVc

21-Dec-09 21:56

i always use like this

CString udata="use 'Database name'";

But still i have problem same.

Re: Re-Mssql question

PCuong198321-Dec-09 21:58

PCuong1983

21-Dec-09 21:58

uhm,
I think: the USE keyword (in t-sql) follow by YourDBName (YourDBName without quote) like this
USE YourBDName
or
USE [YourBDName]

Re: Re-Mssql question

MsmVc21-Dec-09 22:05

MsmVc

21-Dec-09 22:05

Thank
But i test both case there is no effect in out put.Still same problem here.

Re: Re-Mssql question

PCuong198321-Dec-09 23:12

PCuong1983

21-Dec-09 23:12

Did you put USE YourDBName query and select query in same connection session ?

WHEN and WHERE did you use SELECT DB_NAME() AS DataBaseName ?

Re: Re-Mssql question

MsmVc21-Dec-09 23:18

MsmVc

21-Dec-09 23:18

See as in first post first i make connection then i use

CString tr="USE tes";
//(tes is a database)
      Qry1=spSQLServer->ExecuteWithResults((_bstr_t)tr);

this code.
After that i use

SELECT DB_NAME() AS DataBaseName

If i am wrong then pls help me

Re: Re-Mssql question

PCuong198322-Dec-09 3:55

PCuong1983

22-Dec-09 3:55

sorry
This link: http://msdn.microsoft.com/en-us/library/ms131540.aspx[^] may help you.

need delete a file in vc++

kamalilam21-Dec-09 20:04

kamalilam

21-Dec-09 20:04

hi,

i want to know that,how to delete a particuler file using a path in vc++

i knew that DeleteFile() ,resolve it...but i have a piece of code ..will show below..can u give me the solution ..

i stored the path in Dir,

Dir = "d:\testapp\abc.exe"

now delete a file:

deletefile(Dir);//if i take path like this then this function will delete it. //("d:\\testapp\\abc.exe")

now i want to delete this file using single slash("\") inside path..

anybody know???

Re: need delete a file in vc++

KingsGambit21-Dec-09 20:11

KingsGambit

21-Dec-09 20:11

You will have to use '\\' to represent a single '\' character in C/C++ because, anything coming after a single '\' is considered as an escape sequence in C/C++.
http://msdn.microsoft.com/en-us/library/h21280bw(VS.100).aspx[^]

Re: need delete a file in vc++

Jijo.Raj21-Dec-09 20:49

Jijo.Raj

21-Dec-09 20:49

Hi kamalilam,

kamalilam wrote:
now i want to delete this file using single slash("\") inside path..

As per C++ Character Constants[^], \ has special meaning in strings.

So - "d:\\testapp\\abc.exe" is really "d:\testapp\abc.exe".

Best Regards,
Jijo.

_____________________________________________________

http://weseetips.com[^] Visual C++ tips and tricks. Updated daily.

POINT Draw Export/Code

saiyuk6=721-Dec-09 19:25

saiyuk6=7

21-Dec-09 19:25

Is there a application that can export Line Drawings, into POINT = {4,5,10,12...} struct arrays.. to be used with API calls like Polyline(...)

Re: POINT Draw Export/Code

CPallini21-Dec-09 20:42

CPallini

21-Dec-09 20:42

You may use, for instance, a Windows Metafile [^].
Smile | :)

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: POINT Draw Export/Code

saiyuk6=724-Dec-09 9:37

saiyuk6=7

24-Dec-09 9:37

Well i was thinking of more of a drawing tool, or somewhat that could convert it into POINT locations instead? so you could use Polyline, to draw out the item.. Microsoft example uses

POINT aptHexagon[7] = {50,2, 93,25, 93,75, 50,98, 7,75, 7,25, 50,2};

but the Hexagon is way too big, editing it manualy takes alot of time to make it smaller because you would have to recompile to see if lines match up

Detecting when video is done with media player (in MFC)

Joe Woodbury21-Dec-09 11:57

Joe Woodbury

21-Dec-09 11:57

I'm hosting Windows Media Player in an application and can't figure out how to detect when a clip is done playing. Unfortunately, the EndOfStream event isn't implemented. I ran across the idea to use the MediaChange event, but I can't see how that's helpful since it's called multiple times and not very accurately.

Does anyone have a working solution?

Re: Detecting when video is done with media player (in MFC)

Joe Woodbury21-Dec-09 12:42

Joe Woodbury

21-Dec-09 12:42

To answer my own question, it appears that PlayStateChange event passes a value of 8 when the media is done.

re: missing mutex events

Alan Kurlansky21-Dec-09 10:59

Alan Kurlansky

21-Dec-09 10:59

I'm using mutexes to control access to shared data areas between the primary thread and the secondary threads. Is it possible for a thread to miss a mutex event?

Re: re: missing mutex events

KingsGambit21-Dec-09 19:18

KingsGambit

21-Dec-09 19:18

It seems there is no chance that a mutex's signaled state is undetected by a waiting thread.

MSDN - "When the mutex's state is signaled, one waiting thread is granted ownership, the mutex's state changes to nonsignaled, and the wait function returns. Only one thread can own a mutex at any given time."

Re: re: missing mutex events

Alan Kurlansky22-Dec-09 2:55

Alan Kurlansky

22-Dec-09 2:55

What happens if the waiting thread isn't waiting? It could be in the middle of processing some other mutex event.

Re: re: missing mutex events

Rajesh R Subramanian21-Dec-09 20:45

Rajesh R Subramanian

21-Dec-09 20:45

A thread would 'miss' this event, if it is not waiting on the mutex. If it is waiting on the mutex, then the wait function will return, indicating the mutex was acquired (unless something really weird happens, like the mutex was destroyed, in which case too the waiting thread will know what exactly happened).

“Follow your bliss.” – Joseph Campbell

Re: re: missing mutex events

Alan Kurlansky22-Dec-09 2:59

Alan Kurlansky

22-Dec-09 2:59

This is what I was thinking. Therefore, special retry logic would be required to help insure that the buffer getting turned over to the main thread does get processed -sooner or later.

Debugging a C++ program in Visual Studio 2005

loyal ginger21-Dec-09 5:33

loyal ginger

21-Dec-09 5:33

My question has something to do with C/C++ and Visual Studio. I have an MFC project in VS2005 with lots of .h and .cpp files. The program has problems so I run it in debug mode to try to find out what the problems are. For one situation it showed the following message:

Unhandled exception at 0x00761001 in XPT.exe: 0xC0000005: Access violation reading location 0x00000044.

As I clicked the Break button, VS2005 breaks at a line in a source file in my project. The problem is it is on a line irrelavent to the error. It is on a comment line outside any function. The function following that comment block does not seem to have anything to do with that error.

This happened many times in different situations, breaking on comment lines that give me no clue.

This only happened when breaking happened on a third party source file. In my project, this is the sqlite3.c file from SQLite.

I have done a lot such as deleting all the files that are not critical to the project and relaunching the project. (Files such as .ncb, .suo, user-specific options file, etc)

Any idea how to cure that? Any settings, etc. I am running out of ideas. Thanks!

Re: Debugging a C++ program in Visual Studio 2005

Abhi Lahare21-Dec-09 5:44

Abhi Lahare

21-Dec-09 5:44

You IntelliSense is screwed. Try deleting .ncb and .opt files from your project directory and then you may see the code line which point to your exception code.

Re: Debugging a C++ program in Visual Studio 2005

loyal ginger21-Dec-09 6:03

loyal ginger

21-Dec-09 6:03

I just did this:

1. Deleted the .ncb file
2. Deleted the .suo file
3. Deleted the folder "DebugUnicode" (this is the folder for my DebugUnicode build of this project which contains all the intermediate files such as .obj files, and the final .exe file for this project.)
4. Deleted the user options file (.user)

After those, the only files I have in the project are

The .sln file
The .rc file
The .vcproj file
The .h files
The .cpp files
and the two files from sqlite.org: sqlite3.h and sqlite3.c

However, after relaunching VS2005 and the project, it still breaks on that comment line!

Any other suggestions? Thanks!

Re: Debugging a C++ program in Visual Studio 2005

Abhi Lahare21-Dec-09 6:19

Abhi Lahare

21-Dec-09 6:19

Does it breaks in your code or sqlite3.c? Why don;t you single step in your code and then check calls made to functions in sqlite3.c, BTW are you running debug or release version?

Regards
Abhi

Re: Debugging a C++ program in Visual Studio 2005

loyal ginger21-Dec-09 6:27

loyal ginger

21-Dec-09 6:27

It breaks in sqlite3.c. I am running the debug version. I will set break points on calls to sqlite functions and try to find out what is happening. I can find the problems that way, which involves a little bit more hassle. I am just annoyed by the strange behavior of VS2005.

Thanks for your help!

can you simplify the function by #define? [modified]

includeh1021-Dec-09 0:16

includeh10

21-Dec-09 0:16

Can you simplify the function by #define or something else?

I want to simplify code bellow, both dll and dynamically reading file are not suitable because of 2 reasons:
1. those files are created by others, if in my way, I only need to re-compile, and do not need to copy the 150 files (will be more soon) into code.
2. there are around 3K of words and sentences in different languages, which can not be used by index. i.e. for string "Apply now", we can not use
CString cs=data[1743]+data[725] - no one can remember which index is which word.
there is a definition class (generated from Data file), looks like:

class Data
{
WORD
*Time,
....,
*Now,
....,
*Apply,
....
};

use is one of #include bellow, then
CString cs=data.Apply+data.Now;
is OK.

void LangData::P_InitLangFull()
{
	char*p0[]=
	{
		#include "Language\english\language_full.h"		
	};	//do some thing

	char*p1[]=
	{
		#include "Language\french\language_full.h"
	};	//do some thing

        //more
	char*p9[]=
	{
		#include "Language\german\language_full.h"
	};	//do some thing
}

Function code above is quite repeat: only language directory name, english, french, ..., german are changed - totally repeated for 10 times.

It is ok if so, but each language directory has 15 file, so I have to "repeat" the function for 15 times, so second to 15th function look like (only file name is different from first function):

every included h file is plain text as:

"good",
"bad",
"next",

void LangData::P_InitWeather()
{
	char*p0[]=
	{
		#include "Language\english\Weather.h"		
	};	//do some thing

	char*p1[]=
	{
		#include "Language\french\Weather.h"
	};	//do some thing

        //more
	char*p9[]=
	{
		#include "Language\german\Weather.h"
	};	//do some thing
}

You can imagine how ugly the file is at last - I haven't completed it.

I think we may simplify code by #define or some idea, but the #include causes trouble to #define.

any ideas or suggestions?

thanks

modified on Monday, December 21, 2009 9:32 AM

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