Need help on how to set DDX control for dynamically created slider

[John502]

Hi, I have created slider bar dynamically using create function. now i want to create one integer control for the slider bar. Can any one help me how to create DDX control for the slider bar.. I have added DDX control in DoDataExchange function like this:- DDX_Slider(pDX,IDC_SLIDER1, m_Pos); but the app is crashing.. Can any one help me regarding this..? Any help will be appriciated.. Thanks Venki

[Code o mat]

Does it crash or does it raise a debug assertion? If it is the later, check where the assert comes from, there are useful hints about problems as comments in the MFC code...

> The problem with computers is that they do what you tell them to do and not what you want them to do. < > Life: great graphics, but the gameplay sux. <

[John502]

Hi Code-o-mat, i am getting below error in the debugging state.. TRACE1("Error: no data exchange control with ID 0x%04X.\n", nIDC); along with this i am getting other error :- "An unsupported operation was attempted" can you please let me know what i can do now..? Thanks Venki

[Code o mat]

Well, what this generally means is that it did not find any control with that id (IDC_SLIDER1) on the dialog. Are you sure that is the ID you gave to your dynamically created slider? And are you sure you placed the DDX_Slider entry in the class of the correct dialog? Also, are you sure you created your slider BEFORE DoDataExchange runs? If you did something like this:

BOOL CMyDialog::OnInitDialog()
{
__super::OnInitDialog();
m_mySlider.Create(...)
...

That won't work since during the __super::OnInitDialog() call your DoDataExchange will be fired...so instead, do it like:

BOOL CMyDialog::OnInitDialog()
{
m_mySlider.Create(...)
__super::OnInitDialog();
...

> The problem with computers is that they do what you tell them to do and not what you want them to do. < > Life: great graphics, but the gameplay sux. <

[John502]

Hi Code-o-mat, I am able to solve the problem with the help of your tip, thank you so much for your help. I have one more small doubt, i have created pointer object for the CSliderCtrl like this: CSliderCtrl *track_bar; trakbar = new CSliderCtrl; Can't we create normal object instead of pointer object..? if there is any way to create that please kindly let me know.. Thanks Venki

[Code o mat]

Why don't you simply create a member of your dialog class of type CSliderCtrl? Like this:

class CMyDialog: public CDialog
{
...
CSliderCtrl m_myPreciousSlider;
...
};

> The problem with computers is that they do what you tell them to do and not what you want them to do. < > Life: great graphics, but the gameplay sux. <