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I think maybe you need check if you choose the right class name you want.

you can use CXImage
http://www.codeproject.com/KB/graphics/cximage.aspx

UF_PASSWORD_EXPIRED only good for win xp.
UF_PASSWORD_EXPIRED Windows XP: The user 's password has expired.

you can judge the return of ReadString,

from MSDN:
Return Value

A pointer to the buffer containing the text data. NULL if end-of-file was reached without reading any data; or if boolean, FALSE...

you'd better put your code about how you open your dialog and what property it have

if you want to display a jpeg image
you can use IPicture. or use CXImage, it is an open source project.

you can put your function "viewimageex" code here. maybe someone can help you

you can use CreateCompatibleDC to create a DC in memory, and use CreateCompatibleBitmap to create a client for your memory dc, and draw what you need in this memory dc, and then use BitBlt to put...

I tested what you said. I have three dlg.
in a button of dlg1, I make dlg2 DoModel, code link:
void CDlgA::OnButton1()
{
// TODO: Add your control notification handler code here
CDlgB dlg_b;...