C / C++ / MFC Discussion Boards

Re: How do you merge multiple bitmap files?

loyal ginger9-Dec-09 10:34

9-Dec-09 10:34

By merging, do you mean blending them into one image, or stitching them into one image? It's a matter of how to calculate the RGB values of the pixels in the target image. Depending on what you want in the target image, the algorithm will be different. You may have to design your own algorithm.

Re: How do you merge multiple bitmap files?

Dale Haessel9-Dec-09 17:04

Dale Haessel

9-Dec-09 17:04

actually I have a series of enhanced meta files that I want to make into 1 large file (so just merge the pictures into one large picture). So lets say file1 is say 50 x 50 and I have a file2 say 50 x 50, I would like to join the files into 1 file that is say 50x100 or 100x50. Kind of like an html table when you create a row or a column of pictures strewn together.

Hope that kinda makes sense.

Re: How do you merge multiple bitmap files?

loyal ginger9-Dec-09 17:53

loyal ginger

9-Dec-09 17:53

You can first calculate the target image's size based on all the small images' sizes, then create a blank image of the target size in memory. After that, load the small images one by one into memory, then render them to appropriate locations in the target image in memory.

For this purpose, the GDI+ Image class is your friend. If you like the old method, then device independent bitmap (DIB) can be used instead.

There are some useful information in MSDN Magazine. They are freely available online. For example, Paul DiLascia has some open source utilities that can be used in your project.

Hope this helps. Happy programming!

Re: How do you merge multiple bitmap files?

LunaticFringe9-Dec-09 19:22

LunaticFringe

9-Dec-09 19:22

loyal ginger wrote:
You can first calculate the target image's size based on all the small images' sizes, then create a blank image of the target size in memory. After that, load the small images one by one into memory, then render them to appropriate locations in the target image in memory.

For this purpose, the GDI+ Image class is your friend. If you like the old method, then device independent bitmap (DIB) can be used instead.

Rather than using image classes or DIBs and rendering into the new image, an alternative would be to use DIBSections. This would allow access to the raw pixel data, which could then be copied (and manipulated in any desired manner in the process) directly into the target pixels, avoiding the complexities of creating memory DC's, selecting images into them, blitting, inadvertently creating GDI resources leaks, etc, etc.

And I'm afraid Paul DiLascia, writer of PixieLib and countless invaluable MSDN articles, is no more.

Rose | [Rose]

Re: How do you merge multiple bitmap files?

Sauce!9-Dec-09 13:50

Sauce!

9-Dec-09 13:50

Are you asking how you can open the two files and access their pixels directly? Because that's the part we can tell you quite easily. coming up with the algorithm for merging them is up to you.

Re: How do you merge multiple bitmap files?

KarstenK9-Dec-09 21:55

KarstenK

9-Dec-09 21:55

it is easy to do.

Overview: create a big enough target image and copy all source images in it. Use the right coordinates for that. Than save and done.

This fine article should help: ImageStone[^]

Press F1 for help or google it.
Greetings from Germany

CMenu what the scrolling menu buttons named ?

Maximilien9-Dec-09 9:52

Maximilien

9-Dec-09 9:52

Howdy'

(for VS2008 + MFC Feature Pack)

When a menu contains too many items to fit the screen (or available space), it displays buttons to scroll the menu up and down to show hidden menu items.

Is there a name for these buttons or existing controls ?

Thanks.

Max.

This signature was proudly tested on animals.

Re: CMenu what the scrolling menu buttons named ?

KarstenK9-Dec-09 21:57

KarstenK

9-Dec-09 21:57

Such scrollable menu is bad design. Users really dont like it. You should avoid it. D'Oh! | :doh:

Use spy++ to look for details...

Press F1 for help or google it.
Greetings from Germany

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

spicture9-Dec-09 9:18

spicture

9-Dec-09 9:18

I have a Visual Studio 2008 C++ CLR Windows Form application. The Windows Form has a Timer (timer1), a Status Strip (statusStrip1) which has a label (toolStripStatusLabel1) and a Text Box (textBox1). I am trying to display the local system time (localtime_s) in the Status Strip label (toolStripStatusLabel1). I enabled the Timer (timer1) and added the Timer function time1_Tick) to the Load event of the Windows Form. The application complies with no compiler or link errors. I also inserted some debug code to show the local system time in a Text Box (textBox1) to confirm that the local system time is working. It is. However, the local system time never appears in the Status Strip label (toolStripStatusLabel1). How do I fix this? Please be gentle. I am learning Visual C++. Here is the code:

private: 
System::Void timer1_Tick(System::Object^  sender, System::EventArgs^  e)
{
    time_t t = time(NULL);
    
    tm s;
    
    localtime_s(&s, &t);
    
    String^ str = " ";
    
    if (s.tm_hour < 13)
        str = "AM";
    else
        str = "PM";
    
    System::Windows::Forms::StatusStrip toolStripStatusLabel1;
    
    toolStripStatusLabel1.Text = String::Format("{0}:{1}", s.tm_hour,
        s.tm_min, str);
			
    //////// DEBUG ////////
    textBox1 -> Text = String::Format("{0}:{1} {2}", s.tm_hour,
        s.tm_min, str);
    //////////////////////////////
}

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

Richard MacCutchan9-Dec-09 9:52

Richard MacCutchan

9-Dec-09 9:52

I think you may need to force a refresh of your form to get the toolStripStatusLabel to repaint itself. Silly, I know, but ...

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

spicture10-Dec-09 6:51

spicture

10-Dec-09 6:51

I simplified the code for getting the local system time and added a refreseh for the form, but it still isn't showing the local system time in the Status Stril Label.

<br />
private: System::Void timer1_Tick(System::Object^  sender, System::EventArgs^  e)<br />
{<br />
	DateTime^ thisDate = DateTime::Now;<br />
	System::Windows::Forms::StatusStrip toolStripStatusLabel1;<br />
	toolStripStatusLabel1.Text = String::Format("{0:t}", thisDate);<br />
	Form1::Refresh();<br />
}<br />

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

Richard MacCutchan10-Dec-09 7:18

Richard MacCutchan

10-Dec-09 7:18

spicture wrote:
System::Windows::Forms::StatusStrip toolStripStatusLabel1;
toolStripStatusLabel1.Text = String::Format("{0:t}", thisDate);

I think I see what may be wrong; you are creating a temporary System::Windows::Forms::StatusStrip and setting its text, but it is not a child of your form. You need to update the status strip that is defined on your form.

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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