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Hello,
In the following code, I open a MP3 and read the last 128 bytes of information (to see if the MP3 has a ID3 tag).. This code works fine most of the time.. I click the open button on my app which calls this function.. it works 95% of the time, but every now and then it gives me an error.. "an unnamed file was not found", the file does exist and its in the same directory as all the previous files that I have opened.. if I move or copy the file to another location and try to open it, it opens fine.. weird! Any ideas why??
CFileDialog MP3(TRUE,NULL,NULL,OFN_HIDEREADONLY,"MP3 Files (*.mp3)|*.mp3|");
if(MP3.DoModal() == IDOK)
{
strPath = MP3.GetPathName();
ID3TAG.Open(strPath, CFile::modeRead);
ID3TAG.Seek(-128,CFile::end);
ID3TAG.Read(tagData,128);
Thanks,
Rob
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perhaps the file is open by some other process or thread already?
Nish
Sonork ID 100.9786 voidmain
www.busterboy.org
If you don't find me on CP, I'll be at Bob's HungOut
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It shouldn't be open by any other processes. It's on my local machine, I don't have any other apps that are using the file and I don't have any shares open on my PC. I wonder if the strPath string is getting corrupted some how.. I'll do some traces.
If you have any other ideas please let me know.
Thanks!!
Rob
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It appears that the CFile::Seek function is throwing the error.. Any ideas why? It's like it can't find the end of the file. Is there any trouble shooting methods that I can use to determine the cause of the exception?
Thanks again for you help!
Rob
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I don't usually reply to my own msg's but I figured everything out.. so disregard my last few posts..
Thanks,
Rob
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Are you sure, that the file is opened properly ???
For a better error description you might use SDK functions CreateFile, ReadFile, CloseHandle and GetLastError instead of mfc.
And perhaps a work-around:
Get the file length, move to byte position (FileLength-128) from start, read the last lines ... But to be honest, I don`t believe that it is the Seek which really causes the trouble here...
Regards, Marco
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Hy everyone,
I'm tryng to do an application that show in some window the current amount of memory in the user's hard disc. But when the user is using win 95 before OSR2 the function GetDiskFreeSpaceEx must be replaced by GetDiskFreeSpace, and the MSDN Library tell's me to "you should dynamically link to it via GetProcAddress"... I do everything they tell me to do... but in win 95 my program do not work...
causes an error on kernel32.dll that can't find de GetDiskFreeSpaceExA... please, if someone can help me it's will be great!
I'll post an part of my code that I do the implementation of the MSDN Library:
P_GDFSE pGetDiskFreeSpaceEx = NULL;
pGetDiskFreeSpaceEx = (P_GDFSE)GetProcAddress (GetModuleHandle ("kernel32.dll"),"GetDiskFreeSpaceExA");
if(pGetDiskFreeSpaceEx)
{
fresult = GetDiskFreeSpaceEx (windowsDir,
(PULARGE_INTEGER)&FreeBytesToCaller,
(PULARGE_INTEGER)&TotalBytes,
(PULARGE_INTEGER)&FreeBytes);
m_strDirSistema = _T( windowsDir );
m_dwQuotaLivreUsuario = /*(DWORD*/FreeBytesToCaller / MEGABYTE; // this lines given
- me warnings of conversion but it's work correctly m_dwEspacoTotal = /*(DWORD)*/TotalBytes / MEGABYTE;
m_dwEspacoLivre = /*(DWORD)*/FreeBytes /MEGABYTE;
}
thanks all, for the attention!
cheers!!
and sorry my english, I'm brazilian  
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You say that "MSDN Library tell's" [you to] "dynamically link to it via GetProcAddress"
But in your code, you're trying to dynamically link to GetDiskFreeSpaceExA, not GetDiskFreeSpace.
Sorry to dissapoint you all with my lack of a witty or poignant signature.
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RickyC wrote:
and the MSDN Library tell's me to "you should dynamically link to it via GetProcAddress"...
It does nothin of that sort
It says "To determine whether GetDiskFreeSpaceEx is available, call the LoadLibrary or LoadLibraryEx function to load the KERNEL32.DLL file, then call the GetProcAddress function to obtain an address for GetDiskFreeSpaceEx. If GetProcAddress fails, or if GetDiskFreeSpaceEx fails with the ERROR_CALL_NOT_IMPLEMENTED code, use the GetDiskFreeSpace function instead of GetDiskFreeSpaceEx"
so since you are sure you are on pre-osr2 win 95 dont bother using the GetDiskFreeSpaceEx call and stick to using GetDiskFreeSpace
Nish
Sonork ID 100.9786 voidmain
www.busterboy.org
If you don't find me on CP, I'll be at Bob's HungOut
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Hy,
I'm new to MFC... and don't know much...
but in my MSDN Library (january 2001) has something like this:
/*
Use GetDiskFreeSpaceEx if available; otherwise, use
GetDiskFreeSpace.
Note: Since GetDiskFreeSpaceEx is not in Windows 95 Retail, we
dynamically link to it and only call it if it is present. We
don't need to call LoadLibrary on KERNEL32.DLL because it is
already loaded into every Win32 process's address space.
*/
pGetDiskFreeSpaceEx = (P_GDFSE)GetProcAddress (
GetModuleHandle ("kernel32.dll"),
"GetDiskFreeSpaceExA");
if (pGetDiskFreeSpaceEx)
{
fResult = pGetDiskFreeSpaceEx (pszDrive,
(PULARGE_INTEGER)&i64FreeBytesToCaller,
(PULARGE_INTEGER)&i64TotalBytes,
(PULARGE_INTEGER)&i64FreeBytes);
if (fResult)
{
}
}
else
{
fResult = GetDiskFreeSpace (pszDrive,
&dwSectPerClust,
&dwBytesPerSect,
&dwFreeClusters,
&dwTotalClusters);
if (fResult)
{
//some code that I'll not put because the space in this page
}
}
if (!fResult)
printf ("error: %lu: could not get free space for \"%s\"\n",
GetLastError(), argv[1]);
}
I Just try to follow this...
and is not working... sorry if I'm doing something stupid
:\
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Download the latest Platform SDK and #include <newapis.h>. That header has wrappers for GetDiskFreeSpaceEx() and other APIs that handle all that linking nonsense for you.
--Mike--
http://home.inreach.com/mdunn/
While I can't be correct on all matters, I can make the reassuring claim that where I am inaccurate, I am at least definitively inaccurate.
![Heart | [heart]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/love.gif) your ![Green Alien | [Alien]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/alien.gif) with ![Good Stuff | [The good stuff]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/vegemite.gif) and ![Beer | [beer]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/beer.gif)
Sonork - 100.10414 AcidHelm
Test out a prerelease build of my Hotfix Checker v2.0! (1
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Thanks! I've been looking for something just like this for ages. I just which I'd searched the CP Forums sooner!
Jeremy Davis
http://www.astad.org
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LOL
Now we know why you asked a "how to search the forums" doubt-question in the suggestions forum...
Nish
My miniputt high is now 29
I do not think I can improve on that
My temperament won't hold
www.busterboy.org
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I tried searching the CodeGuru forums and got loads of rubbish, plus "matches" that basically didn't match! 
Jeremy Davis
http://www.astad.org
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Hey Guys
I have a dialog form i have made with a tree control in it. I have the dialog box rezizable how do i get the tree control to rezize with the dialog box.
Cheers
Peter
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override OnSize and resize the tree control accordingly
afx_msg void OnSize( UINT nType, int cx, int cy );
Nish
Sonork ID 100.9786 voidmain
www.busterboy.org
If you don't find me on CP, I'll be at Bob's HungOut
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Add the OnSize Message in your Dialog, in this message you must to change the size of the treectrl...
Best Regards
Carlos Antollini.
Sonork ID 100.10529 cantollini
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Cheers Guys
You couldn't also tell me what the function is to rezise the tree control is could you
Cheers
Peter
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use MoveWindow to resize the tree control
Nish
Sonork ID 100.9786 voidmain
www.busterboy.org
If you don't find me on CP, I'll be at Bob's HungOut
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I'm creating a SDi application where i need to draw my data in two different ways. I have both draw functions implemented in my view and i can switch them with a menu command. For the users simpicity i want to have a view with a tab in it. So the user can switch from view with a single mouse click instead of selecting a menu item. The problem is that i don't know how to implement this in a single view. I would like to have a look and feel like the tabs in visual studio, where you have the tabs to switch from one piece of code to another. Does anybody have any idea on how to do this and has some code to show me.
I allready took a look on the site and found this piece of code: http://www.codeproject.com/docview/dynviews.asp. This is allmost what i want. The only thing is that it uses multiple CViews, while i want just one.
Thanks in advance, Delvi
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I'm wanting to write a program that takes control of windows messages , so if u write something in ur chat window.. not only is it read by another program but the other program also alters fonts and colours etc! how do i do this? could i use CHook or CHookManager, and if so then do u know a good place to find instructions for these interfaces???
cheers Jason (ps i'm new to MFC)
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Hi!
If my sieve serves me right, there was an article here or on codeguru with a static control that did interpret some basic HTML tags like <b> and <i>. Did I dream of it, is it gone, or am I blind?
Thanks for your help 
Peter
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Hi all,
What is NMHDR exactly ...
I need explain for each data member in this structure ...
My month article: Game programming by DirectX by Lan Mader.
Please visit in: www.geocities.com/hadi_rezaie/index.html
Hadi Rezaie
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NMHDR is the "first part" of every notification that is sent by a child control (like a list box) to it's parent (e.g. a dialog)
hwndFrom: is the window handle of the child control (the windows thingie that is wrapped up by the MFC CWnd class)
idFrom: is the dialog control id of the child (e.g. IDC_LISTBOX1)
code: the type of tne notification. In case of a list box, e.g. LBN_SELCHANGE (the selection just changed).
Enjoy
Peter
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You may want to check MSDN in visual studio or web.
Check ON_NOTIFY, TN061.
Good luck,
- God bless the World
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