loading dll second time giving error "A required resource was unavailable"

appollosputnik

I am loading an extension dll from my mfc client application, when click on the menu first time the dll dialog is being loade and after i exit or close the dialog, and again clicking on the menu to load again it's giving error that "A required resource was unavailable". what could be the problem please help me to resolve this [code] void CTestRevApp ::On3DView() { typedef VOID (*MYPROC)(CString); MYPROC ProcAdd; BOOL fRunTimeLinkSuccess = FALSE; hinstLib = LoadLibrary(L"C:\\Documents and Settings\\sdh\\My Documents\\REVOLUTIONPROJ_DB\\DllDialog\\package\\DllTest\\Release\\dlltest.dll"); if( hinstLib == NULL) FreeLibrary(hinstLib); ProcAdd = (MYPROC)GetProcAddress(hinstLib, "runAppli"); ProcAdd(NULL); if(ProcAdd == NULL) { AfxMessageBox(L"Unable to get pointer to function runAppi()"); FreeLibrary(hinstLib); hinstLib = NULL; return; } return; } [/code]

Jochen Arndt

Your code looks a little bit mixed up. Try it this way. It should solve your problem:

CTestRevApp::CTestRevApp()
{
hinstLib = NULL;
}

CTestRevApp::~CTestRevApp()
{
if (hinstLib != NULL)
FreeLibrary(hinstLib);
}

void CTestRevApp::On3DView()
{
typedef VOID (*MYPROC)(CString);

MYPROC ProcAdd;
if (hinstLib == NULL)
{
    hinstLib = LoadLibrary(L"C:\\\\Documents and Settings\\\\sdh\\\\My Documents\\\\REVOLUTIONPROJ\_DB\\\\DllDialog\\\\package\\\\DllTest\\\\Release\\\\dlltest.dll");

    if (hinstLib == NULL)
        AfxMessageBox(L"Unable to load library");
}
if (hinstLib != NULL)
{
    ProcAdd = (MYPROC)GetProcAddress(hinstLib, "runAppli");
    if (ProcAdd == NULL)
        AfxMessageBox(L"Unable to get pointer to function runAppi()");
    else
        ProcAdd(NULL);
}

}

appollosputnik

It's not solving the problem. My Client application is still active when i am calling On3DView 2nd time, it's giving still error "A required resource was unavailable" and not laoding the dlg of the dll. I have exactly copied your code it's still giving error.

Jochen Arndt

The error is very probably in your DLL showing a dialog. Common sources are forgetting to release DCs and GDI objects.

appollosputnik

how can i release them manually. Please help me

Jochen Arndt

Do you have the source code? If not, you must contact the supplier of the DLL. If yes, you must check the code. If the code uses GetDC() somewhere, ensure that ReleaseDC() is called when the CDC is no longer used.

appollosputnik

I am releasing it in the ::OnDestroy() fucntion of the view

Jochen Arndt

That's one place where you release a DC (in your app or the DLL?). If not in the DLL, you should concentrate on the DLL code. There may be multiple places in your code using DCs and GDI objects. If you miss any release call or forget to de-select GDI objcets out of context, the error may occcur. I can't really help you without seeing the code. I can only guess. Check this example code:

CDC *pDC = GetDC();
CPen NewPen(PS_SOLID, 0, m_Color);
CPen *pOldPen = pDC->SelectObject(&NewPen);
CFont *pOldFont = pDC->SelectObject(m_pMyFont);
// do something with the DC
...
// Don't forget to select the old objects
pDC->SelectObject(pOldFont);
pDC->SelectObject(pOldPen);
// Don't forget to release the DC
ReleaseDC(pDC);

appollosputnik

I am not able to delete the view it's crashing delete m_pNewView; It's crashing. how can I delete the view.????

Jochen Arndt

I'm sorry, but without knowing your code, I can't really help. Also, is there a relation to the original question, or is it a new one? If it is a new one, you should open a new question. Views are usually handled by the document class and the frame work. To close a view manually, the parent frame of the view must be closed.

appollosputnik

this is my view class of the dll [code] // MyView.cpp : implementation file // #include "stdafx.h" #include "DlgsViewDlg.h" #include "MyView.h" ////////////////////////////////////////////////////////////////////////// #include // Header File For Windows #include // Header File For Windows Math Library #include // Header File For Standard Input/Output #include // Header File For Variable Argument Routines #include // Header File For The OpenGL32 Library #include // Header File For The GLu32 Library #include // Header File For The Glaux Library //#include ///////////////////////////////////////////////////////////////////////// #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif #pragma comment (lib, "OpenGL32.lib") #pragma comment (lib, "glu32.lib") #define NOFPOINTSINARC 5 #define NSWEEP 60 #define DIB_HEADER_MARKER ((WORD) ('M' << 8) | 'B') #define WIDTHBYTES(bits) (((bits) + 31) / 32 * 4) ///////////////////////////////////////////////////////////////////////////// // CMyView typedef enum state { NOMOVE = 0, PAN , ZOOM, ROTATE } statemovement; struct vec3{ float x, y, z; }; GLfloat trans[3]; /* current translation */ GLfloat trans_axes[3]; GLfloat rot[3]; statemovement STATE; GLfloat PI = 4 * atan(1.0); //////////////////////// GLuint base; // Base Display List For The Font Set GLfloat cnt1; // 1st Counter Used To Move Text & For Coloring GLfloat cnt2; // 2nd Counter Used To Move Text & For Coloring bool keys[256]; // Array Used For The Keyboard Routine bool active=TRUE; // Window Active Flag Set To TRUE By Default bool fullscreen=TRUE; // Fullscreen Flag Set To Fullscreen Mode By Default //////////////////////// double CMyView::left = -10.0f; double CMyView::right = 10.0f; double CMyView::top = -10.0f; double CMyView::bottom = 10.0f; double CMyView::znear = -100.0f; double CMyView::zfar = 100.0f; static float zoomFactor = 1.0f; static bool colorChange=false; static double iRed=1.0f; static double iGreen=0.0f; static double iBlue=0.0f; IMPLEMENT_DYNCREATE(CMyView, CView) CMyView::CMyView() :object(0) ,startPoints(NULL) ,endPoints(NULL) ,arcs(NULL) ,pan(false) ,zoom(false) ,rotate(false) ,x(NULL) ,y(NULL) ,allX(NULL) ,allY(NULL) ,allZ(NULL) ,cx(0.0) ,cy(0.0) ,cz(0.0) ,isModel(false) { trans[0] = 0.0f; trans[1] =

appollosputnik

this is my dialog class of the dll.......In the view class you can see I have done ReleaseDC everywhere. Check if could help resolve this error. Thanks a lot for your help. [code] // DlgsViewDlg.cpp : implementation file // #include "stdafx.h" #include "DlgsView.h" #include "DlgsViewDlg.h" #include "MyView.h" #ifdef _DEBUG #define new DEBUG_NEW #endif static UINT BASED_CODE indicators[] = { ID_INDICATOR_NISH, ID_INDICATOR_TIME }; // CAboutDlg dialog used for App About class CAboutDlg : public CDialog { public: CAboutDlg(); // Dialog Data enum { IDD = IDD_ABOUTBOX }; protected: virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support // Implementation protected: DECLARE_MESSAGE_MAP() }; CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) { } void CAboutDlg::DoDataExchange(CDataExchange* pDX) { CDialog::DoDataExchange(pDX); } BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) END_MESSAGE_MAP() // CDlgsViewDlg dialog CString CDlgsViewDlg::fileName = L""; CDlgsViewDlg::CDlgsViewDlg(CString filename, CWnd* pParent /*=NULL*/) : CDialog(CDlgsViewDlg::IDD, pParent) { m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); fileName = filename; } CDlgsViewDlg::~CDlgsViewDlg() { delete m_pNewView; } void CDlgsViewDlg::DoDataExchange(CDataExchange* pDX) { CDialog::DoDataExchange(pDX); } BEGIN_MESSAGE_MAP(CDlgsViewDlg, CDialog) ON_WM_SYSCOMMAND() ON_WM_PAINT() ON_WM_QUERYDRAGICON() ON_COMMAND(ID_FILE_NEW,OnFileNew) //}}AFX_MSG_MAP ON_COMMAND(ID_UTILITY_EXIT, &CDlgsViewDlg::OnUtilityExit) ON_COMMAND(ID_EXIT, &CDlgsViewDlg::OnExit) ON_COMMAND(ID_UTILITY_LOADPROFILE, &CDlgsViewDlg::OnUtilityLoadprofile) ON_COMMAND(ID_UTILITY_GENERATESURFACE, &CDlgsViewDlg::OnUtilityGeneratesurface) ON_COMMAND(ID_UTILITY_DRAW1, &CDlgsViewDlg::OnUtilityDraw1) ON_COMMAND(ID_UTILITY_DRAW3, &CDlgsViewDlg::OnUtilityDraw3) ON_COMMAND(ID_UTILITY_SAVEASIMAGE, &CDlgsViewDlg::OnUtilitySaveasimage) ON_COMMAND(ID_VIEW_WIREFRAME, &CDlgsViewDlg::OnViewWireframe) ON_COMMAND(ID_VIEW_SHADE, &CDlgsViewDlg::OnViewShade) ON_COMMAND(ID_VIEW_NORMAL, &CDlgsViewDlg::OnViewNormal) ON_COMMAND(ID_VIEW_PAN, &CDlgsViewDlg::OnViewPan) ON_COMMAND(ID_VIEW_ZOOM, &CDlgsViewDlg::OnViewZoom) ON_COMMAND(ID_VIEW_ROTATE, &CDlgsViewDlg::OnViewRotate) ON_COMMAND(ID_VIEW_TOPVIEW, &CDlgsViewDlg::OnViewTopview) ON_COMMAND(ID_VIEW_FRONTVIEW, &CDlgsViewDlg::OnViewFrontview) ON_COMMAND(ID_VIEW_SIDEVIEW, &CDlgsViewDlg::OnViewSideview) ON_COMMAND(ID

Jochen Arndt

I'll reply again to this message. You have added too much unformatted code to your other posts (therefore somebody has donevoted them).

You should use the 'code' button on top of the CP message input window to format the selection as C++ code.
You should limit the amount of code. Nobody here will step through too many lines.

Regarding the CView deletion: Why do you use a CView derived class within a CDialog? Using a CWnd derived class as user control should solve your problem. CView classes are used with the document view model and expect to have a frame window as parent.

appollosputnik

your answer is not a solution. try to solve the problem.

Lost User

sujandasmahapatra wrote:

your answer is not a solution

Being rude is not a solution either.

Why is common sense not common? Never argue with an idiot. They will drag you down to their level where they are an expert. Sometimes it takes a lot of work to be lazy Individuality is fine, as long as we do it together - F. Burns

Jochen Arndt

sujandasmahapatra wrote:

your answer is not a solution

The solution is to not use a CView derived class as a client window of a dialog.

sujandasmahapatra wrote:

try to solve the problem

No. You must solve the problem. It's not my job. The only thing I can do, is to help you.

Lost User

5 for your patience.

Why is common sense not common? Never argue with an idiot. They will drag you down to their level where they are an expert. Sometimes it takes a lot of work to be lazy Individuality is fine, as long as we do it together - F. Burns

appollosputnik

i wanted a view on the dialog. so i derived from cview and created the view in the dialog. 1st time everything is coming fine. but without closing the client application if i try to launch again the dialog then it's giving error. Please give me some suggestion how can i get rid of it. Thanks

Jochen Arndt

The problem is that the view is not properly closed. But even if you would close it properly, there will be other problems. A CView is not designed to be a child view of a dialog. It must be a child of a CFrameWnd derived class. Change your CView class to be based on a CWnd.

Chris Meech

And demonstrating a great deal of restraint as well. Good for you. :)

Chris Meech I am Canadian. [heard in a local bar] In theory there is no difference between theory and practice. In practice there is. [Yogi Berra] posting about Crystal Reports here is like discussing gay marriage on a catholic church’s website.[Nishant Sivakumar]