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Hi all,
I've got a binary file which I need to read into my application, the file contains numeric data as well as strings (each one is seperated by a comma). The problem I've got is that the string data is of a variable length so I can't just grab 100 chracters.
As such I'm going through the file a character at a time, where I have string data I have a while loop which goes round until I find a comma, I then put the completed string into a member variable and then start on the next line. When I get to the numeric data instead of doing the above I just do:
ifs >> myDouble ; //ifs is ifstream
however this does not convert the data into numeric format as it always sets myDouble to 0, and when I then next go into a while loop to build up a string it never reads in a character and ends up as an infinite loop.
Does anyone know how I can solve this problem?
cheers,
Andy
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I had this same problem about five years ago where the original application would read in a character at a time from a file. If the file was 1MB in size, that's theoretically around 1 million disk reads. The items in the file were formatted as a number followed by a number followed by a \0 terminated string. The files were huge so a day to process them was not uncommon. I cut the processing down to a matter of minutes by using CMemFile and more intelligently processing the buffer. I read the two numbers using two read statements, and then knowing that the \0 terminated string could be no longer than, say, 200 bytes, I read the next 201 bytes into a buffer. I then searched that buffer using CString::Find() for the terminating \0 character. The next read statement started from the next character following.
Knowing how slow that application could be, the first few times I tried my version, I was not convinced it worked. When I passed it around to a few others, they were amazed at how fast it was.
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
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cheers David, just thought I'd let you know that I've finally figured how to get the double values in:
fileA.get ( ( (char*)&myDouble), sizeof ( double ) ) ;
Andy,
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I am developing a component that will be adding to an existing program. I need to add a certain file and/or folder to the program files if that file and/or folder does not already exists. But this is also dependent on which directory the program is installed on.
How can I:
1. Check the registry, or some other method, to find which drive the program is installed on.
2. Check to see if a certain folder, on that drive, exists.
#2 should be pretty simple, but I am unfamiliar with programming with the registry.
Thank you in advance!
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ChemmieBro wrote:
1. Check the registry, or some other method, to find which drive the program is installed on.
Without knowing any more about the program or how many assumptions can be made, this would require a search of each potential disk in the system.
You can always search the registry in lieu of the disk(s) but there is no guarantee that it will be any faster. If you knew that the program was installed somewhere under the C:\Program Files folder, or in one particular hive of the registry, it would help.
ChemmieBro wrote:
2. Check to see if a certain folder, on that drive, exists.
I've always used _access(..., 0) for this.
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
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Well, I know it will be under either C:\Program Files or D:\Program Files or any other drive.
This check will be done during initialization of my singleton COM object. I was thinking a registry check would be faster than checking the disk.
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ChemmieBro wrote:
Well, I know it will be under either C:\Program Files or D:\Program Files or any other drive.
Try this for starters.
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
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Hi all,
I am new to ole/com. I have dialog based application in which i have inserted shdocvw.dll activex component. I can load html,doc,and other documents. via
m_shBrowser.Navigate((LPCTSTR)m_sPathUrl , &vtEmpty, &vtEmpty, &vtEmpty, &vtEmpty);
It loads succesfully. ( if i open .doc file then winword.exe is loaded in task manager. ?)
Now I want to caputure LBUTTONDOWN,RBUTTONDOWN, MOUSEMOVE message....
I have tried with message map macros .... IT Works when there is no document loaded. But when i load/open any document then I am not able to get any of above message. i have tried with DefWindowProc() handler also but with no luck.
I have searched on net but havent found reason WHY?
and also not found how to do above.
Can anyone guide me how to capture above and such messages?
i dont want to display mouse when it is on the browser control.... and also not want to generate default menu.. instead display my menu....
can anyone point how can i implement?
do i have to create ole eventsink? if so then how?
Thank in advance.
Jetli
conclusion means Coming to wrong Decision with confidence
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Hi, im quite new to Visual C++ (so please go easy on the mombo jumbo thanks).
What i am looking to do is make a "open" dialog. I can easly do it with
<br />
CFileDialog ldFile(TRUE);<br />
if (ldFile.DoModal() == IDOK)<br />
{<br />
}<br />
This brings up a normal open window. However im trying to get it to be a open directory window (like this on http://img121.exs.cx/img121/446/open8js.jpg[^])
Any ideas on how to do this?
Thanks
Cult
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While it can be done with CFileDialog, I think you might want to look at SHBrowseForFolder() first.
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
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My application has several toolbars. The toolbars can be configured thru a command profile. One of them has 4 editboxes that recieve updates to display geographic coordinates. In some cases, I've noticed the updates in the editboxes of the toolbar start to 'bog down'. Can someone tell me specifically what I should be looking with respect to this problem (resource contention), such as WM_PAINT, WM..etc messages? Any help is greatly appreciated -
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how to make a toolbar support 32 bit colour in VC++ 6.0?
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how do i use unicode support in MFC to create menu in other international spoken language that has support only as uniocode characters.i am not an expert in VC++ so please have a beginners approach.i use VC++ 6.0 and winxp operating system
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First you'll need to define UNICODE and _UNICODE. After that you'll need to use Unicode-aware functions, methods, and types (e.g., LPTSTR) . CString is already Unicode-aware so nothing special needs to be done with it. For string literals, prepend them with an L.
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
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In addition you also have to set the entry point symbol to wWinMainCRTStartup. This can be done in the Project->Settings menu->Link tab->Output Category->Entry-point symbol.
Also IMO, one is better off using the TCHAR macros rather then hard coding the unicode functions and string literals.
"You're obviously a superstar." - Christian Graus about me - 12 Feb '03
"Obviously ??? You're definitely a superstar!!!" mYkel - 21 Jun '04
Within you lies the power for good - Use it!
Honoured as one of The Most Helpful Members of 2004
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hi there, i am trying to obtain the 8-bit code for an image. I have found the edge map of an object so i now have black pixels showing the outline of the object on a white background.
I am wondering how I can extrct the bitmap code that contains the coordinates of the pixels that are black in the image.
I am using paintshop pro.
I am using a mathematical method known as the Hausdorff distance method to compare two images and recognise objects, in particular human faces.
If anyone is interested in my work I would be happy to post it on this site.
Hope someone can help me!
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need to use the method Update() in order to modify fileds values.
In VB are not problem, but in VC++ how can I use it?
Can help me with any example?
Thanks a lot
Xavier
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 I use the WebBrowser ActiveX to play my PowerPoint, and every thing is ok except the scrollbar, exactly, I want to make the scrollbar invisible. But it seems that the scrollbar is not the general windows scrollbar.
Can anyone help me, Thanks very much!
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CString str(_T("abc"));
TCHAR* buff=str.GetBuffer(-1);
//is this okey to pass -1 to getbuffer if im not goin
//to modifiy the size the received buffer ?
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I feel it should be
TCHAR* buff=str.GetBuffer(0);
suhredayan
There is no spoon.
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According to MSDN, -1 is not a valid parameter. What exactly is it that you are trying to do?
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
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How to find a DLL's Memory Usage on run-time ?
thanks in advance
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I believe the information you are after must be tracked through the owning application since the application's stack and heap are shared by the DLL. Unless there were internal counters in place within the EXE, I know of no way to distinguish between memory allocated by the EXE vs. memory allocated by the DLL.
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
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Why my program runs more slower when it is built in Unicode mode which is supposed to be more faster?
Lisoft
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