doubt in CFile - C / C++ / MFC Discussion Boards

Re: Can't get local system time to show in a StatusStrip label

spicture11-Dec-09 8:23

spicture

11-Dec-09 8:23

Thank you. I finally got it. Here is the code.

private: System::Void timer1_Tick(System::Object^  sender, System::EventArgs^  e) 
{
        DateTime^ thisDate = DateTime::Now;
	System::Windows::Forms::StatusStrip toolStripStatusLabel1;
	Form1::toolStripStatusLabel1 -> Text = String::Format("{0:f}", thisDate);
}

Re: Can't get local system time to show in a StatusStrip label

spicture11-Dec-09 8:20

spicture

11-Dec-09 8:20

Thnak you. I fianlly gor it. Here is the code.

private: System::Void timer1_Tick(System::Object^  sender, System::EventArgs^  e) 
{
        DateTime^ thisDate = DateTime::Now;
	System::Windows::Forms::StatusStrip toolStripStatusLabel1;
	Form1::toolStripStatusLabel1 -> Text = String::Format("{0:f}", thisDate);
}

Re: Can't get local system time to show in a StatusStrip label

Richard MacCutchan12-Dec-09 1:30

Richard MacCutchan

12-Dec-09 1:30

spicture wrote:
System::Windows::Forms::StatusStrip toolStripStatusLabel1;

This line is redundant; you are creating a temporary object but never using it.

Re: Can't get local system time to show in a StatusStrip label

loyal ginger9-Dec-09 10:37

loyal ginger

9-Dec-09 10:37

Instead of time, if you put a fixed text string in there, does it show?

Re: Can't get local system time to show in a StatusStrip label

spicture10-Dec-09 6:45

spicture

10-Dec-09 6:45

Yes. If I added text to the Status Strip Label's property it shows when the application is run. I have simplified how to get the local system time, but that has not helped.

private: System::Void timer1_Tick(System::Object^  sender, System::EventArgs^  e)
{
	DateTime^ thisDate = DateTime::Now;
	System::Windows::Forms::StatusStrip toolStripStatusLabel1;
	toolStripStatusLabel1.Text = String::Format("{0:t}", thisDate);
				
	//////////////////////////// DEBUG //////////////////////////////////////
	textBox1 -> Text = String::Format("{0:t}", thisDate);
	///////////////////////////////////////////////////////////////////////////////
}

Re: Can't get local system time to show in a StatusStrip label

spicture11-Dec-09 8:22

spicture

11-Dec-09 8:22

Thank you. I finally got it. Her is the code.

private: System::Void timer1_Tick(System::Object^  sender, System::EventArgs^  e) 
{
        DateTime^ thisDate = DateTime::Now;
	System::Windows::Forms::StatusStrip toolStripStatusLabel1;
	Form1::toolStripStatusLabel1 -> Text = String::Format("{0:f}", thisDate);
}

mouse in openGL, double click ??

a04.lqd9-Dec-09 8:33

a04.lqd

9-Dec-09 8:33

here is the code:

int _xC,_yC;
void OnMouse(int button, int state, int x, int y)
{
    int xMax = glutGet(GLUT_WINDOW_WIDTH);
    int yMax = glutGet(GLUT_WINDOW_HEIGHT);
    _xC = x;
    _yC = yMax-y;
	
}

with this code , left click get xC and yC.
use this, i want to make Point array to save x-axis and y-axis of point which is defined by left click by Onmouse code.
but how to stop???
can i use right click or double click to break ???

doubt in CFile

Rakesh59-Dec-09 6:27

Rakesh5

9-Dec-09 6:27

hi all,

i am creating an application in which i want to write the content into an excel.

i have two doubts here.

doubt #1

i am actually using CFile.write function to write data into an excel. but,if i happen to write second time into the excel, it is overwriting the first item instead of appending it to the excel as second item. what should we do for this?

myfile.Open("example.xls",CFile::modeCreate|CFile::modeWrite, NULL);
myfile.Write(sUserID,sUserID.GetLength());

doubt #2
while writing in an excel, i have got three parameters to be written. (name,age and sex). all these three parameters are written in one cell. how to write them in a separate cells?

Thanks for your help in advance..
Rakesh.

Re: doubt in CFile

Jonathan Davies9-Dec-09 6:51

Jonathan Davies

9-Dec-09 6:51

Sounds like you need to move the file pointer on after the write. There's probably a method of CFile to do this, just pass it the GetLength() value. If you don't the pointer stays pointing to the 0 position in the file so the next write will overwrite the previous.

Re: doubt in CFile

Rakesh59-Dec-09 7:23

Rakesh5

9-Dec-09 7:23

hi jonathan,

thanks alot for your reply..

can u please teach me how to pass the pointer using the getlength method?

thanks once again for patiently replying..
rakesh.

Re: doubt in CFile

Jonathan Davies9-Dec-09 7:40

Jonathan Davies

9-Dec-09 7:40

Have a look at http://msdn.microsoft.com/en-us/library/8c5ccz0x(VS.80).aspx[^]
where there's an example, remember it moves the pointer a number of bytes.

Re: doubt in CFile

Richard MacCutchan9-Dec-09 8:46

Richard MacCutchan

9-Dec-09 8:46

The file pointer gets updated automatically on a read or write operation. The next write to the same file will be positioned after the first write's data.

Re: doubt in CFile

Wes Aday9-Dec-09 6:53

Wes Aday

9-Dec-09 6:53

Rakesh5 wrote:
CFile::modeCreate

You are recreating the file each time with new content using that flag.

Why is common sense not common?
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Re: doubt in CFile

krmed9-Dec-09 6:58

krmed

9-Dec-09 6:58

After you open the file, use the SeekToEnd function:

myfile.Open("example.xls",CFile::modeCreate|CFile::modeWrite, NULL);
myfile.SeekToEnd();
myfile.Write(sUserID,sUserID.GetLength());

I can't say that I've ever seen anyone use CFile to write to an excel file, so I'm not sure how you're accomplishing that. Most people would write the data to a .csv file, which can then be opened in excel. Each cell data on the same line would be separated by a comma, with a CR/LF pair at the end of that line.

I don't think you're actually creating a true .xls file - it's most likely just a text file, but with the .xls extension, excel may be able to open it.

Be aware that just because you name a file with .xls as an extension, it's not really an Excel file.

Hope that helps.

Karl - WK5M
PP-ASEL-IA (N43CS)
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Re: doubt in CFile

Rakesh59-Dec-09 7:19

Rakesh5

9-Dec-09 7:19

hi,

thanks alot for your info..

i tried using seektoend function. but it is still overwriting the value..

can u please help me to solve this problem?

and i don understand how to write each value in each cell? can u explain me little more?

thanks,
rakesh.

Re: doubt in CFile

2249179-Dec-09 7:00

224917

9-Dec-09 7:00

CFile is not the right object to work with excel. Presently what you are doing is, creating a text file with name "example.xls" and writing/overwriting its data.
Maybe using "modeAppend" may help you to get away with the overwriting issue. But still may not serve your purpose.

To modify an "real" excel file, or creating a new excel you need to use Excel . Microsoft provides a way to start excel.exe invisible through your program and then open an existing/create_new excel file and make changes to it. This is called Excel Automation/Office Automation.

http://support.microsoft.com/kb/196776[^]

Suhredayan

Re: doubt in CFile

David Crow9-Dec-09 7:10

David Crow

9-Dec-09 7:10

In addition to the Excel Automation suggestions, you could also try using CRecordset with Excel's ODBC interface.

"One man's wage rise is another man's price increase." - Harold Wilson

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Re: doubt in CFile

Mattias G9-Dec-09 10:39

Mattias G

9-Dec-09 10:39

I you'd prefer the text format over the CRecordset/Automation approaches, you could use a tab character ("\t") or a comma to separate the cells, and a newline to separate the rows. If you only use the CFile::modeCreate flag when opening the file, the file gets truncated to zero length, effectively overwriting your data. Have a look at CFile::modeNoTruncate. Something like this:

CFile theFile;
theFile.Open(_T("example.txt"), CFile::modeCreate|CFile::modeNoTruncate|CFile::modeWrite, NULL);
CString strOut = _T("Row1Col1\tRow1Col2\tRow1Col3\r\nRow2Col1\tRow2Col2\tRow2Col3");
theFile.Write(strOut, strOut.GetLength() * sizeof(TCHAR));

Note how the file name extension is "txt", you can still open it in Microsoft Excel by right-clicking it. Or you could keep the "xls" extension and keep pretending it's a real binary Excel file. No user will ever notice Smile | :)

Re: doubt in CFile

Paulraj G9-Dec-09 17:15

Paulraj G

9-Dec-09 17:15

1. FILE * pFile;
pFile = fopen ("C:file.csv","a");
if (pFile!=NULL)
{
CString x2 = "CString1"+","+"CString2"+"\n";
fwrite(x2, x2.GetLength(), 1, pFile);
fclose (pFile);
}
2. Use ,(comma) operator for seperate the objects. use .csv file. it will open in excel.

G.Paulraj

openGL can read an bmf picture or another picture ????

a04.lqd9-Dec-09 4:17

a04.lqd

9-Dec-09 4:17

if it can, show me how to use, please !!!

Re: openGL can read an bmf picture or another picture ????

Cedric Moonen9-Dec-09 4:23

Cedric Moonen

9-Dec-09 4:23

No, OpenGL cannot load any images on its own, you will need to use an external library for that (for instance DevIL or FreeImage or maybe GLUT). But I don't know if these libraries support bmf because I never heard of that format.

Cédric Moonen
Software developer

Charting control [v2.0]
OpenGL game tutorial in C++

Re: openGL can read an bmf picture or another picture ????

a04.lqd9-Dec-09 9:44

a04.lqd

9-Dec-09 9:44

sorry , it is my mistake -> bmp.
i need to load a bmp picture by openGL ,then i can use mouse in openGL to draw a point in that pic.

Re: openGL can read an bmf picture or another picture ????

Cedric Moonen9-Dec-09 20:15

Cedric Moonen

9-Dec-09 20:15

Then you can use DevIL or FreeImage (I think even GLUT is able to load bmp files but I'm not sure at all, I never used it). Did you look at these libraries ?
If you are interested, you can also look at my second tutorial about OpenGL: it discusses resource management but it is probably it bit more higher level than what you are looking for.

Cédric Moonen
Software developer

Charting control [v2.0]
OpenGL game tutorial in C++

File Associations under Vista and up...

Code-o-mat9-Dec-09 3:54

Code-o-mat

9-Dec-09 3:54

Hello folks!

Could someone please shed some light on this? I found out the hard way that the file-association technics used in Windows XP and prior to it no longer work in Windows Vista and above. Trying to modify the registry entries to create a file association for a program simply fails in an "access denied" error. So i googled around and found IApplicationAssociationRegistration[^], tried to use it but SetAppAsDefault[^] gave me "file not found". I might be wrong but i figured this means that the application needs to be registered as a "Default Program" before any associations can be done. How to do this? I found this[^] on Microsoft's site, here it tells me that to register an application as default one has to create some registry entries for the application. BUT if i try to create these entries i once again get an "Access Denied". At this point i am a bit lost. I know the documentation there says that usually the installer registers the application as a default program and that installers are usually ran as administrator, however, my program is a very small and simple viewer application which does not have nor need an installer so i want to do the whole association thing from the application itself. Anyone knows how?

Thanks in advance.

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Sometimes you just have to hate coding to do it well. <

Re: File Associations under Vista and up...

David Crow9-Dec-09 4:18

David Crow

9-Dec-09 4:18

See here.

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