Using CView class to draw my document data

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I have created an MFC SDI CFormview based app and I just successfully added another view derived from CView, I'm stuck on adding my document data to this new view. I can add text to it in the OnDraw section by doing this: pDC->TextOutW(100, 250, L"WOW!!, this is really confusing!!"); How do I display my data from my document?

Posted 29-Jan-12 14:40pm

DrBones69

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4 solutions

Solution 1

The CView class has a method called GetDocument that returns a pointer to the document.
You can typecast this returned CDocument pointer to a pointer of your derived document class.
If you've created the new view using the wizard, there should be a wrapper method called GetDocument in the view class.
Otherwise, check the form view class on how it is done.

Posted 29-Jan-12 15:45pm

«_Superman_»

Solution 3

The "view" is designed for custom drawing. So, you receive a CDC* and you draw on the View.

The "document" is where you put/get the information. But, of course, you must adapt it to your needs.
It has two virtual methods: OnNewDocument and Serialize that you must override to make it work the way you want.

If you like a screen with controls (not custom drawn) I reccomend you use a CFormView.

Posted 31-Jan-12 2:49am

ErnestoNet

Updated 31-Jan-12 2:50am

v2

Comments

DrBones69 31-Jan-12 22:02pm

I'm already using CFormView, this questions is for an additional view. See question above.

ErnestoNet 1-Feb-12 7:17am

Sorry, English is not my natural language. I meant that you may need another CFormView (instead of a CView).

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Jochen Arndt · Accepted Answer · 2012-01-29T22:30:00

Solution 2

As already noted by _Superman_, use GetDocument() to get the data from your document class.

OnDraw() of views is rather seldom used. If your view is derived from a Windows control or contains multiple controls, call the control specific update functions like SetWindowText(), SetItem() from the OnUpdate() function of your view. Use OnInitialUpdate() to initiliaze the controls after the view has been created like OnInitDialog() with dialogs.

A simple example:

C++

void CMyView::OnInitialUpdate()
{
    m_editText1.SetLimitText(255);
    CView::OnInitialUpdate();
}
void CMyView::OnUpdate(CView* pSender, LPARAM lHint, CObject* pHint)
{
    m_editText1.SetWindowText(GetDocument()->GetText1());
}

The lParam and pHint parameters can be used to update only specific parts of your view. To trigger an update, use CDocument::UpdateAllViews().

Posted 29-Jan-12 22:30pm

Jochen Arndt

Comments

DrBones69 30-Jan-12 22:28pm

I'm using this http://msdn.microsoft.com/en-us/library/s199bks0.aspx method to add my additional view to my project. It works, but when I create a class that uses CView as the base I only get OnDraw created by the wizard and in the OnDraw is the "CDocument* pDoc = GetDocument();" inside. Where do I go from here to display one item in my document?

Jochen Arndt 31-Jan-12 3:15am

It depends on your data and how you want it to be drawn. To get the item data, make the data member of your documant class public, or add a GetItem() function. Then you can use GetDocument() from your view to access the item data. If you are using common windows controls inside your view, let OnDraw() as it is and add the two virtual update functions to your view class using the Overrides tab in the Properties window.

DrBones69 4-Feb-12 21:42pm

May I add some of my code to illustrate what I have setup? There are about 200 lines of code. This is not the complete app, but it may help you to explain to me the correct path to take.

Jochen Arndt 5-Feb-12 5:00am

200 lines are too much. Especially for comments.

Please tell us about the kind of data (text, numbers, graphics) that should be shown, and how they should be shown. Based on this, the view class has to be designed.

DrBones69 5-Feb-12 10:42am

I'm trying to create a view that I can print. I read numerous articles that tell me I can not print from the CFormView class, so I created a new CView class within my project and a switching routine to display my document and I would like to print this information. It(Document) consists of text and numbers. Maybe I'm going about this all wrong? I also have never used a CView before, I'm really good with the dialog based apps now. I'm still learning...

Jochen Arndt 6-Feb-12 3:38am

Oh, printing.
You can print from CFormView, but you have to implement all the printing functions (derive all CView member functions containing 'Print'). The print output can be generated from within OnPrint() or OnDraw() (check for pDC->IsPrinting() when using OnDraw). A simple print implementation may loop through he controls of the view, get their positions, convert positions for usage with the output device (print or preview) and draw text using pDC->DrawText(). If the content does not fit on one page, things are more complicated.

But implementing printing may be too complex for beginners.

DrBones69 8-Feb-12 21:19pm

I found an easy way to print!! Microsoft has a solution here http://support.microsoft.com/kb/133275 with a few minor tweeks, I was able to print my data.

-DrB

DrBones69 · Accepted Answer · 2012-02-08T15:23:00

Solution 4

Microsoft had this [^] outdated article on printing from any class other than CView. With a few minor tweeks, I'm printing my data. :-)

-DrB

Posted 8-Feb-12 15:23pm

DrBones69

Updated 9-Feb-12 11:02am

v2