Re: Redirection in command line "<" - C / C++ / MFC Discussion Boards

Re: On Dialog Box

Chandrasekharan P25-Mar-08 19:56

Chandrasekharan P

25-Mar-08 19:56

yes its on a control.. i am using directshow for this..

Re: On Dialog Box

Rajkumar R25-Mar-08 19:45

Rajkumar R

25-Mar-08 19:45

first of all if you see Mediaplayer the main window can be sized anyway, but the video window adjust to keep the aspect ratio of the video. So adjust the display of video than the dialog box, because size and aspect ratio varies for each video.

Chandrasekharanp wrote:
now this can be resized only by dragging the bottom right side... is is possible?

you can prevent changing the size only in one dimension by overriding WM_SIZING, i cannot thing of any other advanced tricks.

Chandrasekharanp wrote:
i believe that there are three possibilities.

There are more possibilities, WM_SIZING[^]

void CYourDlg::OnSizing(UINT fwSide, LPRECT pRect)
{
	CDialog::OnSizing(fwSide, pRect);

	if (fwSide != WMSZ_BOTTOMLEFT	&& 
		fwSide != WMSZ_BOTTOMRIGHT	&& 
		fwSide != WMSZ_TOPLEFT		&& 
		fwSide != WMSZ_TOPRIGHT )
	{
		// if not corner sizing keep the same size;
		RECT rc;
		GetWindowRect(&rc);
		*pRect = rc;
	}
}

Re: On Dialog Box

Chandrasekharan P25-Mar-08 20:25

Chandrasekharan P

25-Mar-08 20:25

i am using directshow here. and i have seen in media player that the aspect ratio does not change when u drag the window.. do we have an option in direct show to set the aspect ratio. there is one option available

<br />
[ nAspectRatio = ] MSWebDVD.AspectRatio <br />

i actually dint understand what this is.. i guess u have some knowledge on direct show.

Re: On Dialog Box [modified]

Rajkumar R25-Mar-08 21:22

Rajkumar R

25-Mar-08 21:22

Chandrasekharanp wrote:
i am using directshow here

not purely, you are using an ActiveX control that build on Directshow filters.

Chandrasekharanp wrote:
[ nAspectRatio = ] MSWebDVD.AspectRatio

Chandrasekharanp wrote:
i actually dint understand what this is

I never used this control, this is the property that gives a number (some naming convention n-any number, i-interger, 0 -object, not very sure) it actually gives the aspect ratio of the video stream. And this is a read-only property so you cannot expect to do something like resizing video.

Try MSWebDVD.SetClipVideoRect(oRect); where you have to calculate the rectangle every time the dialog is resized (I guess you are resizing the control when dialog is resized, still need to be done) keeping the aspected ratio (aspect ratio of the video can be obtained from the property, MSWebDVD.AspectRatio) same.
* on size handler of dialog
* resize the control
* from the new size of control and the aspect ratio of video calculate video rect
* set the video Rect MSWebDVD.SetClipVideoRect().

Try this.

modified on Wednesday, March 26, 2008 3:42 AM

Re: On Dialog Box

rp_suman25-Mar-08 19:55

rp_suman

25-Mar-08 19:55

Chandrasekharanp wrote:
i have a dialog box which can be resized...

Hi, how did you made your dialog resizable?
Is it dialog based application or different?

Best Regards,
Suman

Re: On Dialog Box

Chandrasekharan P25-Mar-08 20:07

Chandrasekharan P

25-Mar-08 20:07

in the properties of the dialog there are options to make it resizable (its a combobox in styles tab)..
and it is a dialog based application.

Redirection in command line "<"

uusheikh25-Mar-08 17:30

uusheikh

25-Mar-08 17:30

Hi,

I know that if i do this; program1.exe > out.txt, all the output of program1.exe will be written to out.txt file (printf, cout).

But, what happens when i do program1.exe < input.txt? Imagine input.txt contains some data, how would i load the data into program1.exe with the above command? What C++ code should i write to handle that?

Also, if i do program1.exe < input.txt, the argc in main() will only return 1, that is program1.exe. Why not 3? (for program1.exe, <, and input.txt)

Explanantion appreciated. Thanks.

(I'm using win32 console app on VC++)

Re: Redirection in command line "<"

User 58385225-Mar-08 17:59

User 583852

25-Mar-08 17:59

uus831 wrote:
But, what happens when i do program1.exe < input.txt?

stdin is changed from the keyboard to input.txt

To read the data you can use anything that reads from stdin line scanf(), getch() etc

uus831 wrote:

Also, if i do program1.exe < input.txt, the argc in main() will only return 1, that is program1.exe. Why not 3? (for program1.exe, <, and input.txt)

Because the < input.txt is not an argument to your application, its an instruction to the os to modify what stdin points to

Re: Redirection in command line "<"

fefe.wyx25-Mar-08 18:21

fefe.wyx

25-Mar-08 18:21

Note that stdin and stdout are also file handles. When no redirection occurs, stdin is the keyboard and stdout is the monitor.

In the form of program1.exe > out.txt, stdout is assigned with a file handle to the file out.txt, instead of the monitor. So all the output goes into out.txt instead of the monitor.

In the form of program1.exe < in.txt, stdin is assigned with a file handle to the file in.txt, instead of the keyboard. So whenever you read from stdin, e.g. when you call the scanf() function, the data come form in.txt, not the keyboard.

Redirecting is handled by the OS, not by the program, so the program itself will know nothing about the redirection, and redirection directives would be passed to program as parameters. Thus argc in main is 1, not 3.

Re: Redirection in command line "<"

uusheikh25-Mar-08 20:18

uusheikh

25-Mar-08 20:18

Thanks for the info. But how do i determine how much data to read from the file? I mean, if the file in.txt contains 10 rows of data, how can i determine that i need to call scanf 10 times? Or, i cant?

Re: Redirection in command line "<"

Maxwell Chen25-Mar-08 21:03

Maxwell Chen

25-Mar-08 21:03

uus831 wrote:
But how do i determine how much data to read from the file? I mean, if the file in.txt contains 10 rows of data, how can i determine that i need to call scanf 10 times? Or, i cant?

To read file, I suggest you not to use DOS-shell indirection (< ) but use program arguments instead. Such as:

MyTest.exe -i "sample.txt"
or
MyTest.exe /i "sample.txt"

In the above example, your application handles the command-line arguments and gets the file name(s). Then you can use fstream to load the content of the whole file(s), or to read part of the file(s).

Maxwell Chen

Re: Redirection in command line "<"

uusheikh25-Mar-08 21:25

uusheikh

25-Mar-08 21:25

Ok, thanks man. That's a better idea.

Re: Redirection in command line "<"

Maxwell Chen25-Mar-08 21:18

Maxwell Chen

25-Mar-08 21:18

As the Windows built-in tool, fc.exe, it compares two files. The command for using this tool is as:

fc /b C:\Temp\hello.txt D:\Doc\hello_2.txt

Maxwell Chen

Re: Redirection in command line "<"

David Crow26-Mar-08 4:10

David Crow

26-Mar-08 4:10

uus831 wrote:
But how do i determine how much data to read from the file? I mean, if the file in.txt contains 10 rows of data, how can i determine that i need to call scanf 10 times?

fscanf() will tell you when it has read past the end of the file stream:

while (fscanf(stdin, ...) != EOF)
{
    ...
}

"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

How to insert a child form?

TooShy2Talk25-Mar-08 16:48

TooShy2Talk

25-Mar-08 16:48

Hi,

I'm working on a MDI application and i need to display multiple child window. I don't know how to do it.

Hope somebuddy can give a comment.
Thanks.

Using CFileDialog?

dipuks25-Mar-08 15:59

dipuks

25-Mar-08 15:59

I am using three different file types in my File Dialog.

Now when the User types in a file name and select a particular file
type from the drop down box and tries saving it, it doesn't save the
file type selection from the drop down box.

And also when i tried to get the file extension using the GetFileExt()
function it doesn't work.

Unless user types the file extension along the file name, this
function is not able to retrieve the file extension. How can this be
resolved?

Thanks in advance.

Re: Using CFileDialog?

David Crow25-Mar-08 16:11

David Crow

25-Mar-08 16:11

dipuks wrote:
And also when i tried to get the file extension using the GetFileExt()
function it doesn't work.

Unless user types the file extension along the file name, this
function is not able to retrieve the file extension. How can this be
resolved?

Have you provided a default extension?

Compare and merge

KirkNarine25-Mar-08 9:15

KirkNarine

25-Mar-08 9:15

I'm not sure I'm in the right forum, if it's possible in C++ or if there's a program that does this. I'm trying to automatically compare and merge two .rtf documents and save it in a folder. The documents are the same name in different folders. I would like to know if there's a function call to use the attribute in word. Thanks for any comments or criticisms. Thanks

Re: Compare and merge

led mike25-Mar-08 10:14

led mike

25-Mar-08 10:14

KirkNarine wrote:
if it's possible in C++

Yes it is.

KirkNarine wrote:
if there's a program that does this.

I don't know. Google might be able to help you discover that.

KirkNarine wrote:
The documents are the same name in different folders.

That information is not relevant.

KirkNarine wrote:
I would like to know if there's a function call to use the attribute in word.

I have no idea what that means.

KirkNarine wrote:
Thanks for any comments or criticisms. Thanks

You are welcome. You're welcome

led mike

Re: Compare and merge

Maxwell Chen25-Mar-08 17:50

Maxwell Chen

25-Mar-08 17:50

KirkNarine wrote:
or if there's a program that does this.

Yes. Use WinMerge tool.

Maxwell Chen

Method to get file path

nvphap25-Mar-08 8:55

nvphap

25-Mar-08 8:55

Iam using MFC .In my project,I choose "single document" .while Iam writting,I have a problem that when I choose "File" on menu ,I continue to choose Open .MFC Program display me a dialog which help choose a file .And after I choose file,I don't know how do I get file path .Please help me.Thanks
Iam going to post pictures on forum,but I can't find where post it.Iam sorry

Re: Method to get file path

David Crow25-Mar-08 10:05

David Crow

25-Mar-08 10:05