Re: Read File - C / C++ / MFC Discussion Boards

Re: Integration in MFC

Sakhalean15-Jun-10 23:05

Sakhalean

15-Jun-10 23:05

Ok thank you I will try.

Re: Integration in MFC

goorley15-Jun-10 22:01

goorley

15-Jun-10 22:01

It's discrete data. Calculating the integral is really simple. If you can write a loop and use addition you will be fine.

std string mid function

gmallax15-Jun-10 21:17

gmallax

15-Jun-10 21:17

hi,

im doing conversion of cstrings to std string.

In cstring mid function is available.

But i cant find the equalent function in std string...

can any one help me?

Thanx.

Re: std string mid function

Nuri Ismail15-Jun-10 21:25

Nuri Ismail

15-Jun-10 21:25

You can simulate CString::Mid by using substr[^]. Also have a look at this[^] excellent class. Smile | :)

TeeChart Pro AX v6

eyalle15-Jun-10 20:19

eyalle

15-Jun-10 20:19

Hello all,
im using TeeChart Pro AX v6 of Steema Software SL.
i was wondering how, if at all, can i paint a strip line in a chart insted of a regular line.
thank's

code example for regular line that works in my project:

chart->Series(Series).GetAsLine().SetStairs(true);
chart->Series (Series).GetAsLine().SetInvertedStairs(true);

Read File

MsmVc15-Jun-10 19:49

MsmVc

15-Jun-10 19:49

Hi All

I have problem to read file.I used CStdioFile.FIle like this

Abc

Xyz

Zsd

Code goes to infinite loop.

if(fileread.Open("C:\\Test.txt",CFile::modeRead | CFile::modeNoTruncate))
 {
		CString readstring="";
	 
		fileread.Seek(0,CFile::begin);
		 while(fileread.end)
		{
			
			fileread.ReadString(readstring.Trim());
					
				
		 }
fileread.Close();
}

Or this code only read first line.Rest line skip.

if(fileread.Open("C:\\Test.txt",CFile::modeRead | CFile::modeNoTruncate))
 {
		CString readstring="";
	 
		fileread.Seek(0,CFile::begin);
		 while(fileread.end)
		{
			
			fileread.ReadString(readstring.Trim());
                                if(readstring.IsEmpty())
				{
					
				break;
				}
				else
				{
                                 }
					
				
		 }
fileread.Close();
}

Can any one give me tips for solve the problem.
Thanks in advance

Re: Read File

«_Superman_»15-Jun-10 20:37

«_Superman_»

15-Jun-10 20:37

Try this -

while (fileread.ReadString(readstring))

«_Superman_»

I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

Polymorphism in C

Re: Read File

MsmVc15-Jun-10 20:39

MsmVc

15-Jun-10 20:39

Thanks _Superman

Re: Read File

Nuri Ismail15-Jun-10 20:45

Nuri Ismail

15-Jun-10 20:45

You beat me to it. Thumbs Up | :thumbsup:

I must refresh my browser more often. Smile | :)

Re: Read File

Nuri Ismail15-Jun-10 20:43

Nuri Ismail

15-Jun-10 20:43

You should test for the end of the file using the result from ReadString method of CStdioFile. ReadString returns a NULL pointer when the end of file has been reached. See here[^] for additional details. Smile | :)

A little change for your code:

if(fileread.Open("C:\\Test.txt", CFile::modeRead | CFile::modeNoTruncate))
{
      CString readstring="";
      fileread.Seek(0,CFile::begin);

      // Loop while ReadString returns NULL
      while(fileread.ReadString(readstring))
      {		
	// Process the string here						
      }
      
      fileread.Close();
}

Re: Read File

«_Superman_»15-Jun-10 20:49

«_Superman_»

15-Jun-10 20:49

Happens to the best of us. Smile | :)

«_Superman_»

I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

Polymorphism in C

unhandled win32 exception occurred..??

krishnaram_198315-Jun-10 19:34

krishnaram_1983

15-Jun-10 19:34

Hi,

I have an application developed using wxWidgets(C++ based) with Visual C++ 2008 standard edition. The application runs fine without any problem. But when it comes to closing of an application, it throws and exception message stating

An unhandled win32 exception has occurred in myapp.exe [892]

the number in [] keeps on changing every time.

How do i come out of this exception.? Or can anyone one tell me what leads to such exception??

Thanks in advance

Re: unhandled win32 exception occurred..??

Cedric Moonen15-Jun-10 20:13

Cedric Moonen

15-Jun-10 20:13

It could be a lot of things. I suggest you use your debugger to track down the problem, that's one of the best way to retrieve more information about the error.

Cédric Moonen
Software developer

Charting control [v3.0]
OpenGL game tutorial in C++

Re: unhandled win32 exception occurred..??

Niklas L15-Jun-10 20:25

Niklas L

15-Jun-10 20:25

The number you see is the process identifier. This is likely to be a new number every time your application is running.

home

Re: unhandled win32 exception occurred..??

_AnsHUMAN_ 16-Jun-10 0:27

_AnsHUMAN_

16-Jun-10 0:27

Did you try to debug the cause after you try to close the window?
If not, it would be a good idea to do that. Alternatively you can take a minidump of the application and use a tool like windbg to analyze the crash.

I am a HUMAN. I have that keyword (??? too much) in my name........
Wink | ;-)

_AnsHUMAN_b>

Re: unhandled win32 exception occurred..??

Aescleal16-Jun-10 6:54

Aescleal

16-Jun-10 6:54

The most common cause I've seen of an exception when you close an application is that someone's been way too clever and generously used pointers mixed with a soupcon of manual memory management. The most common results have been:

- damaging the heap by overwriting something you shouldn't
- double deletion of an object
- using a deleted object

The best way of avoiding this sort of problem is to not have it in the first place. Don't play with pointers and manual memory management unless you really have to. If you do make sure you use all the facilities of the language and runtime library to help you.

Anyway, that's advice for next time... in the meantime have a look at the documentation for structured exception handling (SEH) and how to convert win32 structured exceptions into C++ exceptions. That might help you work out what's happening by decoding what the win32 exception is in the first place.

Another thing you could do is start building earlier versions of the code until you find one that the problem didn't happen in and start working forwards again until you find the first version that caused the problem. The diffs between the versions might give you an idea of what's happening that caused the error.

Cheers,

Ash

How to play Windows Media Player in VC++.NET

shiv@nand15-Jun-10 19:31

shiv@nand

15-Jun-10 19:31

Hi all, i want to play Media player in application im using VC++ 2005,i have added Windows Media Player via COM, and added buttons play stop and pause.
In VC++ 6 there is options like
m_player.SetUrl ("c:\\abc.wmv");
m_player.GetControls().play();

But in VC++ 2005 I am not Getting those options? plz help me.
I wanted to play the WMP in Windows CE?

So please Help me. I have no Idea how to play a Vedio files?

Thanks in advance.

Re: How to play Windows Media Player in VC++.NET

Cool_Dev15-Jun-10 19:47

Cool_Dev

15-Jun-10 19:47

if you are using .NET framework, please post it in Managed C++/CLI forums

Re: How to play Windows Media Player in VC++.NET [modified]

Destiny7775-Apr-11 9:06

Destiny777

5-Apr-11 9:06

I too am looking to do the same thing in an existing large Visual Studio 2005 MFC C++ Application.
- Have added the Windows Media Player Control but can't seem to find the way at runtime to add a URL to point to a local file or point to an http:// Address.

So some details would be helpful for the person that originally asked the question and those that are looking for similar answers.

In a Visual Studio 2005 C# project it is very simple to do... just add the Windows Media Player Control to the form. Call the Control "MediaPlayer". Then in your code set the URL to a file or a http:// value as needed.

// Set the media to be played by our Windows Media Player Control on our C# Form
MediaPlayer.URL = "C:\Windows\Media\FileToBePlayed.avi";

It is quite a bit different in Visual Studio 2005 MFC C++... the Windows Media Player Control objects that are exposed in C# are not exposed in C++... perhaps there is something that got missed along the way.

My search goes on...

Suspicious | :suss:

-- Modified Tuesday, April 5, 2011 3:48 PM

copy a registry value to another value

pubis15-Jun-10 16:07

pubis

15-Jun-10 16:07

Hi,

I already have three registry values (type=REG_SZ):

HKEY_CURRENT_USER\SOFTWARE\FARM\ValueName1
[Value1=I like]

HKEY_CURRENT_USER\SOFTWARE\FARM\ValueName2
[Value2=Apples]

HKEY_CURRENT_USER\SOFTWARE\FARM\ValueName3
[Value3=NULL]

I need a piece of code that reads Value1 and Value2, combine them together and write them to Value3 so Value3 becomes:

HKEY_CURRENT_USER\SOFTWARE\FARM\ValueName3
[Value3=I like Apples]

That's all! simple no? but I have been trying all the day but nothing seems to want to work! Confused | :confused:

Any help would be very appreciated

Re: copy a registry value to another value

«_Superman_»15-Jun-10 18:26

«_Superman_»

15-Jun-10 18:26

RegOpenKeyEx/RegCloseKey will open and close registry keys.
RegQueryValueEx will read values from the registry key.
RegSetValueEx will write values to the registry key.
For combining values use string functions like _tcscat or the CString + operator.

«_Superman_»

I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

Polymorphism in C

Re: copy a registry value to another value

pubis16-Jun-10 4:26

pubis

16-Jun-10 4:26

Thank you but I know all that staff, my problem is how to make it work!

Here's a code I use (ignored error checking)

unsigned long type=REG_SZ, size=1024;
char iLike[1024]="";
char Apples[1024]="";
char iLikeApples[1024]="";
LONG rV;
HKEY hKey = NULL;

// reading the first value
rV = RegOpenKeyEx(HKEY_CURRENT_USER, "SOFTWARE\\FARM\\ValueName1", 0, KEY_ALL_ACCESS, hKey);
rV = RegQueryValueEx(hKey, "Value1", NULL, type, (LPBYTE)iLike, size);
RegCloseKey(hKey);

// reading the second value
rV = RegOpenKeyEx(HKEY_CURRENT_USER, "SOFTWARE\\FARM\\ValueName2", 0, KEY_ALL_ACCESS, hKey);
rV = RegQueryValueEx(hKey, "Value2", NULL, type, (LPBYTE)Apples, size);
RegCloseKey(hKey);

// combining values
[code?]

// writing the third value
rV = RegOpenKeyEx(HKEY_CURRENT_USER, "SOFTWARE\\FARM\\ValueName3", 0, KEY_ALL_ACCESS, hKey);
rV = RegSetValueEx(hKey, "Value3", 0, REG_SZ, [parameter1?], [parameter2?]);
RegCloseKey(hKey);

Please tell me what I should put in the the place of [code?], [parameter1?] and [parameter2?]
please do not advice me to use this or use that, if you want to help me just complete the code above.

Thank you VERY for you help

Re: copy a registry value to another value

«_Superman_»16-Jun-10 18:50

«_Superman_»

16-Jun-10 18:50

[code?]

_tcscpy_s(iLikeApples, 1024, iLike);
_tcscat(iLikeApples, Apples);

[parameter1?]

(LPBYTE)iLikeApples

[parameter2?]

_tcslen(iLikeApples)

«_Superman_»

I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

Polymorphism in C

Re: copy a registry value to another value

pubis17-Jun-10 4:00

pubis

17-Jun-10 4:00

I love you man Smile | :)

Re: copy a registry value to another value

pubis16-Jun-10 7:58

pubis

16-Jun-10 7:58

Here's a code I use (ignored error checking)

unsigned long type=REG_SZ, size=1024;
char iLike[1024]="";
char Apples[1024]="";
char iLikeApples[1024]="";
LONG rV;
HKEY hKey = NULL;

// reading the first value
rV = RegOpenKeyEx(HKEY_CURRENT_USER, "SOFTWARE\\FARM\\ValueName1", 0, KEY_ALL_ACCESS, hKey);
rV = RegQueryValueEx(hKey, "Value1", NULL, type, (LPBYTE)iLike, size);
RegCloseKey(hKey);

// reading the second value
rV = RegOpenKeyEx(HKEY_CURRENT_USER, "SOFTWARE\\FARM\\ValueName2", 0, KEY_ALL_ACCESS, hKey);
rV = RegQueryValueEx(hKey, "Value2", NULL, type, (LPBYTE)Apples, size);
RegCloseKey(hKey);

// combining values
[code?]

// writing the third value
rV = RegOpenKeyEx(HKEY_CURRENT_USER, "SOFTWARE\\FARM\\ValueName3", 0, KEY_ALL_ACCESS, hKey);
rV = RegSetValueEx(hKey, "Value3", 0, type, [parameter1?], [parameter2?]);
RegCloseKey(hKey);

Please tell me what I should put in the the place of [code?], [parameter1?] and [parameter2?]
please do not advice me to use this or use that, if you want to help me just complete the code above.

Thank you VERY much for your help

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