C / C++ / MFC

26-Apr-04 2:31

macmac38 wrote:
But the full string is arriving..

How are you verifying this claim?

Whct class does the Read() method belong to? I'm curious if the fourth parameter is being used correctly. If more than one byte is being read, yet dwBytesRead equals 1, something is awfully wrong. It might also be the third parameter, but I've never used the OVERLAPPED structure before so I can't say for sure.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

custom resource problem

chocm20-Apr-04 23:36

20-Apr-04 23:36

I created a custom resource in the SDI project, in other words, there is a new folder named "MyText" under the "MyView recources" in the resource view workspace , and there is an entry named "IDR_MYTEXT1" in the "MyText" folder. The content of IDR_MYTEXT1 is imported from a text file. I want to show the text file in the view window. but some error occured, I can't see the text file content at all.

Thanks for help in advance!

void CMyView::OnInitialUpdate()
{
CView::OnInitialUpdate();
HRSRC hrsrc=::FindResource(::AfxGetApp()->m_hInstance,"IDR_MYTEXT1","MyText");

HGLOBAL hglb=::LoadResource(::AfxGetApp()->m_hInstance,hrsrc);
LPVOID m_ptr=::LockResource(hglb);

}

void CMyView::OnDraw(CDC* pDC)
{
CMy0421Doc* pDoc = GetDocument();

ASSERT_VALID(pDoc);
pDC->TextOut(0,0,"I insert a text file as a custom resource, and show it in the SDI program");

pDC->TextOut(100,100,(char*)m_ptr);

}

Have you tried Internet Telephone Services[^]

David Crow21-Apr-04 2:52

21-Apr-04 2:52

chocm wrote:
...but some error occured

And that error would be what?

In the OnInitialUpdate() method, you have a local variable named m_ptr. How are you expecting to access this variable from within the OnDraw() method?

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

chocm21-Apr-04 18:46

21-Apr-04 18:46

m_ptr is a member variable of CMyView, so I think it is valid in the OnDraw();

David Crow22-Apr-04 2:05

22-Apr-04 2:05

So change the LPVOID m_ptr=::LockResource(hglb) statement to m_ptr=::LockResource(hglb) instead.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

chocm22-Apr-04 18:26

22-Apr-04 18:26

Yes I have change the line to m_ptr=::LockResource(hglb), the problem is still the same, no text file was shown as expected.

I tried to set a breakpoint at the line:
HGLOBAL hglb=::LoadResource(::AfxGetApp()->m_hInstance,hrsrc);

and then pressed the button Go, in the output window, I got hrsrc's value is 0X00000000, clicked to extract the button left to the "hrsrc", there is some info shown as "unused CXX0030: Error: expression can't be evaluated"

the hglb's vaule is 0xcccccccc

Does the FindResource() work improperly? I need more suggestions, Thanks!

David Crow23-Apr-04 2:08

23-Apr-04 2:08

chocm wrote:
Does the FindResource() work improperly?

Not if it is used correctly. If it, or LoadResource() are returning NULL, call GetLastError() to find out why.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

chocm24-Apr-04 23:20

24-Apr-04 23:20

I was told to add the MAKEINTRESOURCE to the parametre in the function FindResource(), Then all the code began to work properly.

FindResource(::AfxGetApp()->m_hInstance,MAKEINTRESOURCE(IDR_MYTEXT1),"MYTEXT");

Another question, under what condition is the MAKEINTRESOURCE necessary?

David Crow26-Apr-04 2:20