Runtime error with member function pointers

Hi all,

I need some expert advice. I had the following code running but after moving it from one file to several files (because the code is being merged in another branch) it somehow broke and I get this runtime error:

Run-Time Check Failure #0 - The value of ESP was not properly saved across a function call. This is usually a result of calling a function declared with one calling convention with a function pointer declared with a different calling convention.

I am quite sure it has something to do with the member function pointers because when I comment out these lines
mainButton->SetOnDownFunction(&CDiagnoseWindow::OnMainButtonDown, this);
infoButton->SetOnDownFunction(&CDiagnoseWindow::OnInfoButtonDown, this);
graphButton->SetOnDownFunction(&CDiagnoseWindow::OnGraphButtonDown, this);

the error disappears.

I read on several places that it might have something to do with using a wrong calling convention. I have no idea if I am doing that nor to what it should be changed. This is only my first code with member function pointers (to get a grip on them) so I can not rely on any experience.

All help is appreciated

regards,

Jef

This is a short version of the code:
diagnosewindow.cpp (partial)

#include "DiagnoseWindow.h"
...
#include "DiagNavButton.h"

CDiagnoseWindow::CDiagnoseWindow(coord_t win_size) : CWindow("diag win", win_size, POPUP_VALUE_FRAME_PRIORITY+1)
{
int i;
this->SetSize(win_size);
SetRoundCorners(true);
SetBorderColor(BLACK);
currentLayer = LAYER_MAIN;

//Main
mainButton = new CDiagNavButton(Coord(240,1), P_TAB_MAIN);
mainButton->SetOnDownFunction(&CDiagnoseWindow::OnMainButtonDown, this);
AddWidget(mainButton);
infoButton = new CDiagNavButton(Coord(240,37), P_TAB_INFO);
infoButton->SetOnDownFunction(&CDiagnoseWindow::OnInfoButtonDown, this);
AddWidget(infoButton);
graphButton = new CDiagNavButton(Coord(240,74), P_TAB_DIAG_GRAPH);
graphButton->SetOnDownFunction(&CDiagnoseWindow::OnGraphButtonDown, this);
AddWidget(graphButton);

...
}
...
void CDiagnoseWindow::OnMainButtonDown(void)
{
...
}

void CDiagnoseWindow::OnInfoButtonDown(void)
{
...
}

void CDiagnoseWindow::OnGraphButtonDown(void)
{
...
}

diagnosewindow.h (partial)

class CDiagnoseWindow : public CWindow
{
public:
CDiagnoseWindow(coord_t win_size);
~CDiagnoseWindow() {}

void InitSPN(int diagItem, int SPN);
void SetActiveItem(uint8 activeItem);
void UpdatePage(bool down);

private:
void EraseDataRegion();
void OnRefresh(void);
void OnOpen(void);
void OnClose(void);
virtual bool OnExternalTouch(uint32 button_id, event_e event_id);
void ChangeTitle(int SPN);
void OnMainButtonDown(void);
void OnInfoButtonDown(void);
void OnGraphButtonDown(void);
...
};

diagnavbutton.h (complete)

#ifndef _diag_nav_button_h
#define _diag_nav_button_h

#include "Widget.h"

class CDiagnoseWindow;
class CIcon;

typedef void (CDiagnoseWindow::*PushCallback)(void);

class CDiagNavButton : public CWidget
{
public:
CDiagNavButton(coord_t loc, const CLang* label_id);
~CDiagNavButton() {}

void OnSelect(void);
void OnDeselect(void);
void OnRefresh(CGraphicFrame *frame_p);
void SetOnDownFunction(PushCallback pushCallback, CDiagnoseWindow * parentWindow);
void Push();

private:
void OnOpen(CGraphicFrame *frame_p);
const CLang* label_id;
void OnDown(void);
text_attrib_t text_attrib;
uint8 text_color;
region_t region;
CIcon * button;
CGraphicFrame *diagNavButtonFrame;
bool redrawText;
PushCallback _PushCallback;
CDiagnoseWindow * parentWindow;
};

#endif

diagnavbutton.cpp(complete)

#include "DiagNavButton.h"
#include "Icon.h"
#include "bitmapharvester.h"

CDiagNavButton::CDiagNavButton(coord_t loc, const CLang* label_id) : CWidget("DiagNavButton", region)
{
this->label_id = label_id;
this->SetTouchable(true);
this->SetFocused(true);
region.loc = loc;
region.size.x = 64;
region.size.y = 35;
}

void CDiagNavButton::OnOpen(CGraphicFrame *frame_p)
{
diagNavButtonFrame = frame_p;

button = new CIcon();
button->SetIcon(&bitmap_button_off);
button->Draw_Icon(frame_p, region);

text_color = WHITE;
text_attrib.text_p = CLanguage::GetPhrase(label_id);
text_attrib.unicode_text_p = NULL;
text_attrib.text_style = TEXT_BOLD | TEXT_VCENTER | TEXT_CENTER;
text_attrib.text_size = 16;
frame_p->DrawTextW(region, &text_attrib, WHITE, 0xE6);

redrawText = false;
}

void CDiagNavButton::OnSelect(void)
{
button->SetIcon(&bitmap_button_on);
button->Draw_Icon(diagNavButtonFrame, region);
redrawText = true;
text_color = BLACK;
Push();
}

void CDiagNavButton::Push()
{
if(_PushCallback != NULL)
(parentWindow->*_PushCallback)();;
}

void CDiagNavButton::OnDeselect(void)
{
button->SetIcon(&bitmap_button_off);
button->Draw_Icon(diagNavButtonFrame, region);
redrawText = true;
text_color = WHITE;
}

void CDiagNavButton::OnRefresh(CGraphicFrame *frame_p)
{
if(redrawText)
{
frame_p->DrawTextW(region, &text_attrib, text_color, 0xE6);
redrawText = false;
}
}

void CDiagNavButton::SetOnDownFunction(PushCallback pushCallback, CDiagnoseWindow * parentWindow)
{
_PushCallback = pushCallback;
this->parentWindow = parentWindow;
}

[6003 byte] By [Jef Patat] at [2007-11-20 10:14:11]

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