My Dll is unable to load resources !?

[might]

I don`t know the reason but my dll isn`t be able to load resources. Even that simple code below, fails.
CString str;
str.LoadResource(IDS_MYSTR);

I tried to create a modal dialog but it also failed to load resource of the dialog template.
CDialog myDlg(IDD_DIALOG_MYDLG);
myDlg.DoModal(); // Returns -1

I even tried to write;

CDialog *pMyDlg = new CDialog;
pMyDlg->Create(IDD_DIALOG_MYDLG); //Create(...) asserts


in dlgcore.cpp

BOOL CDialog::Create(LPCTSTR lpszTemplateName, CWnd* pParentWnd)
{
ASSERT(IS_INTRESOURCE(lpszTemplateName) || AfxIsValidString(lpszTemplateName));

m_lpszTemplateName = lpszTemplateName; // used for help
if (IS_INTRESOURCE(m_lpszTemplateName) && m_nIDHelp == 0)
m_nIDHelp = LOWORD((DWORD_PTR)m_lpszTemplateName);

#ifdef _DEBUG
if (!_AfxCheckDialogTemplate(lpszTemplateName, FALSE))
{


ASSERT(FALSE); // invalid dialog template

!!!! DEBUGGER STOPS EXECUTION {AFTER THE ASSERT(FALSE)} HERE !!!!!!

namePostNcDestroy(); // cleanup if Create fails too soon
return FALSE;
}
#endif //_DEBUG

......
.....
}

I don`t know how to overcome that problem. If you have experienced the same problem and/or know the solution, would you please let me know

Thanks in advance

[CornedBee]

Are you absolutly sure that the resource script is in your project and contains all the resources you load?

[CornedBee]

There is also something with the resource instance handle in MFC, but I don't know much about that. Have you tried tracing with a debugger through the LoadString call?

[might]

Firstly, thanks for your reply.

I rechecked the resources and didn`t find any mistake.

I put a breakpoint on the code

CDialog myDlg(IDD_DIALOG_MYDLG);

and in the Locals window:

myDlg
- CDialog
- m_lpszTemplateName 0x00000007 <Bad Ptr> const char *


IDD_DIALOG_MYDLG is defined as 7 and the value of m_lpszTemplateName is correct, so I even don`t know why it`s a bad pointer.

[parksie]

It's an invalid pointer, but that's ok because it isn't *used* as one (see the documentation...).

[might]

The bad prt m_lpszTemplateName is the reason of the assertion
see below:

// in CDialog::Create(...)

#ifdef _DEBUG
if (!_AfxCheckDialogTemplate(lpszTemplateName, FALSE)) // m_lpszTemplateName is equal to lpszTemplateName
{
ASSERT(FALSE); // invalid dialog template

!!!! DEBUGGER STOPS EXECUTION {AFTER THE ASSERT(FALSE)} HERE !!!!!!

namePostNcDestroy(); // cleanup if Create fails too soon
return FALSE;
}
#endif //_DEBUG

[might]

Debugger traces
ERROR: Cannot find dialog template with IDD 0x0007.

BOOL AFXAPI _AfxCheckDialogTemplate(LPCTSTR lpszResource, BOOL bInvisibleChild)
{
ASSERT(lpszResource != NULL);
HINSTANCE hInst = AfxFindResourceHandle(lpszResource, RT_DIALOG);
HRSRC hResource = ::FindResource(hInst, lpszResource, RT_DIALOG); // FindResource or AfxFindResourceHandle is unsuccessful
if (hResource == NULL)
{
if (DWORD_PTR(lpszResource) > 0xffff)
TRACE(traceAppMsg, 0, _T("ERROR: Cannot find dialog template named '%s'.\n"),
lpszResource);
else
TRACE(traceAppMsg, 0, "ERROR: Cannot find dialog template with IDD 0x%04X.\n",
LOWORD((DWORD_PTR)lpszResource));
return FALSE;
}

.............
............
...........
}


BTW, You`re right Parksie, m_lpszTemplateName is OK.


In that case I realized that MFC is hell.

[CornedBee]

Are you sure that AfxFindResourceHandle returns a valid value?

[might]

I realized the problem.
When I call AfxGetResourceHandle() in CWinApp::InitInstance() of my DLL it returns 0x490000. Resource handle of the main executable is 0x400000. And When I call AfxGetResourceHandle() in an exported function of the Dll, it returns 0x400000; the resource handle of the exe, not the dll !?

So, When the Dll tries to load a resource, it tries to find in the main executable`s. Thus, that becomes almost impossible to load it.

[CornedBee]

That's what I guessed. You can set this handle with AfxSetResourceHandle, but you have to reset it after loading, else all subsequent resource loading ops in the main exe will fail...