C / C++ / MFC Discussion Boards

Programatically create Bitmap file: How To???

JHAKAS17-Jun-04 2:46

17-Jun-04 2:46

Hi i am doing following:

From my function SaveAsBitmap

	CClientDC dc(this);<br />
	MemDC.Detach ();<br />
	MemDC.CreateCompatibleDC(&dc);<br />
<br />
	m_WfrBmp.Detach ();<br />
	m_WfrBmp.CreateCompatibleBitmap(&dc, 860, 1100);<br />
	CBitmap *pOldBitmap = (CBitmap *)MemDC.SelectObject(&m_WfrBmp);<br />
<br />
	MemDC.SetMapMode(MM_LOENGLISH);<br />
//	MemDC.PatBlt(0, 0, 860, 1100, WHITENESS);	<br />
	MemDC.SetBkMode (TRANSPARENT);<br />
	MemDC.SetBkColor (RGB(255,255,255));<br />
<br />
	MemDC.Rectangle (100,100,400,400);<br />
<br />
        // Now save the bitmap to the BMP file <br />
        Filename ="C:\\12.bmp";<br />
        CDIBSectionLite	dib;<br />
        HBITMAP hnd = (HBITMAP)m_WfrBmp.GetSafeHandle (); 	<br />
        dib.SetBitmap (hnd);<br />
        dib.Save(Filename);

I am getting Black bitmaps only.....

What is the problem...

Any help/suggestions

Leave your mark wherever you go

Re: Programatically create Bitmap file: How To???

V.17-Jun-04 2:50

17-Jun-04 2:50

get your header info and write your bitmap pixel per pixel (binary so use fwrite)

NOTE: write away like BGR and NOT RGB. For some reason it is that way. (think memory access time is the reason, but I'm not sure)

Find some info on the net about the structure of a bmp file.

good luck.

"If I don't see you in this world, I'll see you in the next one... and don't be late." ~ Jimi Hendrix

Re: Programatically create Bitmap file: How To???

KarstenK17-Jun-04 4:24

KarstenK

17-Jun-04 4:24

Maybe you should Get the bits of the MemDc Dead | X|

Try this @ home. (B&B)

Re: Programatically create Bitmap file: How To???

John R. Shaw17-Jun-04 12:04

John R. Shaw

17-Jun-04 12:04

I hope there is nothing attched before you make those calls to Detach() or your program will have resource leaks.

After drawing to the bitmap via Rectangle, select pOldBitmap into MemDC. If either function SetBitmap() or Save() needs to select it into a DC, then neither one can do it until MemDC releases ownership. A bitmap can only be selected into one DC at a time.

INTP

CTreeCtrl

Gizmo7917-Jun-04 2:36

Gizmo79

17-Jun-04 2:36

I currently use a CTreeCtrl with checkboxes for each item. How can I know when I check an item.

Is there an event sent to the control or something else ? The method CTreeCtrl::Getcheck() works, but I must to have informations just when I click, to update several datas ... D'Oh! | :doh:

--
Gizmo

Re: CTreeCtrl

David Crow17-Jun-04 2:55

David Crow

17-Jun-04 2:55

Gizmo79 wrote:
How can I know when I check an item.

Have you looked at either the TVN_SELCHANGED or TVN_SELCHANGING notification?

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Re: CTreeCtrl

Arjan Schouten17-Jun-04 3:00

Arjan Schouten

17-Jun-04 3:00

void C3StateTree::OnLButtonDown(UINT nFlags, CPoint point) 
{
	UINT uFlags = 0;

	HTREEITEM hItem = HitTest(point, &uFlags);

	// Check if the checkbox is clicked
	if( uFlags & TVHT_ONITEMSTATEICON )
	{
		if(GetCheck(hItem))
		{
			// Item is checked but after the click it will be unchecked
			TraverseDownAndSelectTree(hItem, false);
			TraverseUpAndSelectTree(hItem, false);
		}
		else
		{
			TraverseDownAndSelectTree(hItem, true);
			TraverseUpAndSelectTree(hItem, true);
		}
        }
}

Arjan

Re: CTreeCtrl

Gizmo7917-Jun-04 3:16

Gizmo79

17-Jun-04 3:16

Thanks, it works fine.

I don't use the WM_LBUTTONDOWN event, but the NM_CLICK event and it works too.

I didn't know how to verify if the mouse was over the checkbox, but know, it's done. Tanks you.

--
Gizmo

ActiveX registration

marcomars17-Jun-04 2:20

marcomars

17-Jun-04 2:20

Hello,
my MFC dialog based app uses a freeware activex I found on the net.

To use it, the relative ocx file must be registered in the system.

Is there a way to make the app do itself without the user having
to run regsvr32 c:\..... ?

I added the lines

STARTUPINFO si;<br />
PROCESS_INFORMATION pi;<br />
ZeroMemory( &si, sizeof(si) );<br />
ZeroMemory( &pi, sizeof(pi) );<br />
CreateProcess(NULL,                   // No module name (use command line). <br />
              "regsvr32 MyOcx.ocx",// Command line. <br />
              NULL,                   // Process handle not inheritable. <br />
              NULL,                   // Thread handle not inheritable. <br />
              FALSE,                  // Set handle inheritance to FALSE. <br />
              0,                      // No creation flags. <br />
              NULL,                   // Use parent's environment block. <br />
              NULL,                   // Use parent's starting directory. <br />
              &si,                    // Pointer to STARTUPINFO structure.<br />
              &pi );                  // Pointer to PROCESS_INFORMATION structure.*/

inside InitInstance().

It seems to partially work:

with the ocx unregistered, the first time I execute the app
it brings out the information message box saying "DllRegisterServer MyOcx..."
From now on each time I execute the app first I see the box and finall the app.

I'd love to skip the first dummy execution and to close automatically the system info box without having to hit OK.

Any suggestion about this?

Thanks for the precious help.

Marco.

Re: ActiveX registration

Antony M Kancidrowski17-Jun-04 2:38

Antony M Kancidrowski

17-Jun-04 2:38

use "regsvr32 myocx.ocx /s"

NOTE: /s parameter this makes it register silently! Big Grin | :-D

Ant.

I'm hard, yet soft.
I'm coloured, yet clear.
I'm fuity and sweet.
I'm jelly, what am I? - David Williams (Little Britain)

how to decide the parent dialog

dadacncn17-Jun-04 2:18

dadacncn

17-Jun-04 2:18

Hello,

I have a dialog, for example dialog3, which can be created by dialog1 and dialog2 through .DoModal(). How to decide which dialog is the parent dialog In the class dialog3?

thanks inadvance

Re: how to decide the parent dialog

David Crow17-Jun-04 2:56

David Crow

17-Jun-04 2:56

dadacncn wrote:
How to decide which dialog is the parent dialog In the class dialog3

Are you talking about GetParent(), or IsKindOf()?

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Re: how to decide the parent dialog

dadacncn17-Jun-04 3:11

dadacncn

17-Jun-04 3:11

yes. I think I need GetParent() or IsChild(). But I don't know how to use them. do you have an example? maybe it will help me.

Re: how to decide the parent dialog

User 665817-Jun-04 3:20

User 6658

17-Jun-04 3:20

Haven't tested it, but this might work:

CWnd* pParent = NULL
pParent = GetParent();
if(pParent)
{
   if(pParent->IsKindOf(RUNTIME_CLASS(CDialog1)))
     // true;
   elseif(pParent->IsKindOf(RUNTIME_CLASS(CDialog2)))
     //  true
    else
     // huh?
}

regards

modified 12-Sep-18 21:01pm.

Re: how to decide the parent dialog

dadacncn17-Jun-04 3:51

dadacncn

17-Jun-04 3:51

thank you very much. but in the .h and .cpp files of CDialog1 need DECLARE_DYNAMIC and IMPLEMENT_DYNAMIC.

How to Serialize this?

Tcpip200517-Jun-04 2:17

Tcpip2005

17-Jun-04 2:17

I want to Serialize several HTMLs(2 or >2)with source into a single file.for example *.abc. when I load the file that saved,I can show the HTMLs in a htmlview.How to do this? I have never worked on file Serialize.I need your help.I use VC6.Thank you very much!

Alick

Re: How to Serialize this?

Blake Miller17-Jun-04 4:00

Blake Miller

17-Jun-04 4:00

How about you create a CStringArray.
Copy each stream of HTML text into a separate CString.
Assign these CStrings to the CStringArray.
Serialize the CStringArray to your file.
When you reload it, each HTML 'file' will be in its own CString.
You can use each CString as the HTML text for your view.

Re: How to Serialize this?

Tcpip200517-Jun-04 5:09

Tcpip2005

17-Jun-04 5:09

Thank you for your idea. but how about the source(jpg,gif etc.) and how to encapsulate? I intended to use ziplib. what I want to do is just the direct explore modal of winzip(double click on a zip file,winzip will open it,doesn't extract exactly you can see the files encapsulated in the zip file).
In my condition there is just one addition that I encapsulated just HTMLs with source.I hope I can open a html file in my HtmlView not lanuch IE. That's all.

Thak you all the same,Blake.

Setting Dialog Box position

sschilachi17-Jun-04 2:12

sschilachi

17-Jun-04 2:12

How do you set the position of a dialog box, as you cant call SetWindowPos before DoModal, nor can you call it after, as the dialog box window doesnt exist.

Thanks

Re: Setting Dialog Box position

Antony M Kancidrowski17-Jun-04 2:19

Antony M Kancidrowski

17-Jun-04 2:19

Do it in OnInitDialog()

Ant.

I'm hard, yet soft.
I'm coloured, yet clear.
I'm fuity and sweet.
I'm jelly, what am I? - David Williams (Little Britain)

Write a simple program that can read/write files from/into a CD

ledallam17-Jun-04 2:03

ledallam

17-Jun-04 2:03

How to access a CD Writer programatically for reading and writing files from hard disk into CD place in the CD Writer in VC++

Madhavi

Re: Write a simple program that can read/write files from/into a CD

Henry miller17-Jun-04 3:10

Henry miller

17-Jun-04 3:10

There are several ways depending on what exactly you want. If you are willing to go XP only, you can use a built in API for burning data disks. Doesn't work with 2000 or 98 though.

NERO has (sells? I'm not sure) a kit with an API for doing this. Even though I've never checked it out I'd guess this is the best solution. It works around firmware bugs in different drives, and the differences between the various MMC versions. I haven't looked at it so I don't know how much it does. There are a couple others that google will find too.

The hardest, but the one that gives you the most control: get the scsi specifications form t10.org. (nearly all CD drives speak scsi, even IDE drives. I don't think there are any exceptions faster than 2x or maybe 4x) Get the ISO specifications (free from ECMA, otherwise pay), or UDF specifications (half from OSTA, half from ECMA) and start working. Then figure out how to talk to the device directly with your OS (isn't hard, but NT bases systems are different from 95 based systems, and unix is different again). Last get one of every device and work around all the various bugs that each one has.

I've done the last one myself. It gives you the most control, but you also have to control a lot. Power calibration, write speed, track mode. Some of the above you have several choices, and you almost have to guess which one you should use.

CObject and CArchive again

Anonymous17-Jun-04 1:53

Anonymous

17-Jun-04 1:53

Hi!

I have had a problem yesterday and written code as suggested. I have it now working.

I have a class CBook and another class CSubject. CSubject has a member which is a CList of CBook pointers. I want to serialize my CSubject object together with any CBook objects it contains.

I wrote my code like was suggested and inherited both from CObject. I overloaded the CObject Serialize() member function in both CBook and CSubject and added the MFC serialization macros. When serialize a CSubject object to disk the data file that is created contains all the data I want. The data is the subject and all the books I add to the subject. So that works very well but now I come to deserialize from disk and I have problems. How do I know how to create enough books when I am calling the Serialize() function? I thought I must be able to in the CSubject::Serialize() function count the books in the list first and store the number. When I deserialize I then know how many to try to get?

Is this the right way to do what I want?

What is really the point in the COBject inheritance? What value must it give to me as I think I am doing all the work in my Serialize() functions myself!

Re: CObject and CArchive again

Rodrigo Pinto Pereira de Souza17-Jun-04 2:20

Rodrigo Pinto Pereira de Souza

17-Jun-04 2:20

I suggest you to change the architecture of your class to :

This is corrected way to serialize a List Object.

I Write only the important parts to serialize a list.

//Header File .h
class CBook: public CObject
{
public:
DECLARE_SERIAL(CBook)
CBook();

// You must implement CopyConstructor and = operator.
CBook(const CBook& objSource);
CBook& operator=(const CBook& objSource);

virtual void Serialize(CArchive& ar); // Implement your serialization
public:
CString m_sName;
};

class CBookList: public CList<cbook, cbook&="">
{
public:
CBookList();
virtual ~CBookList();
}

template <> void AFXAPI SerializeElements <cprvfile>
(CArchive& ar, CPrvFile* pNewPrvFile, int nCount);

class CSubject : public CObject
{
public:
DECLARE_SERIAL(CSubject)
CSubject();
virtual void Serialize(CArchive& ar); // Implement your serialization
public:
CString m_sName;
CBookList m_BookList;
};

// Implementation File .cpp

// The Secret of Serialize List Elements !!!!
template <> void AFXAPI SerializeElements <cbook>
(CArchive& ar, CBook* pNewBook, int nCount)
{
for (int i = 0; i < nCount; i++, pNewBook++)
{
// Serialize each CBook object
pNewBook->Serialize(ar);
}
}

Enjoy it Cool | :cool:

Rodrigo Pinho Pereira de Souza

Re: CObject and CArchive again

Anonymous17-Jun-04 2:54

Anonymous

17-Jun-04 2:54

Thank you.

This looks hard. Is there any benefit over what I was suggesting I do with storing the number of objects so I know how many to restore?

Also what about using CObList? This provides a Serialize() function which I may be able to call. Will this restore my list of objects with no further work? I think I could have a data member in my CSubject class which is of type CObList. When CSubject::Serialize() is called I must then only have to call CObList::Serialize() yes?

I am quite confused with all this. I can make it work now though and it looks good but then I hear that there are other ways that can be better though not easier Smile | :)

I also still do not understand why CObject provides any function to me. As I can tell it just gives me a Serialize() function as a declaration which I must then write anyway.

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