用vc的wizard做一个运行时不可见的a.ocx,里面加两个方法,long GetData()
{
return globaldata;
}
void SetData( long data )
{
globaldata = data;
}在ctl的cpp文件的最上面加入
long globaldata=0; // 全局变量再用wizard建立一exe,把ocx加入工程,在dialog上放入两个一样的这个ocx,名字分别叫m_1,m_2,然后写如下程序
void CMy112Dlg::OnOK()
{
m_1.SetData( 100 ); // 第一句
long a = m_2.GetData(); // 第二句
}
运行到第二句后,a=2, 我没有看花眼吧???这是怎么回事啊?有什么办法可以避免这个问题吗?应该ocx中要用到如下的回调函数:
LRESULT CALLBACK WindowProc(
HWND hwnd, // handle to window
UINT uMsg, // message identifier
WPARAM wParam, // first message parameter
LPARAM lParam // second message parameter
);
所以,在函数中,我要有一些参数才能工作的,所以要用到全局变量的,但出现了这样的问题,请问我该怎么解决??up有分
{
return globaldata;
}
void SetData( long data )
{
globaldata = data;
}在ctl的cpp文件的最上面加入
long globaldata=0; // 全局变量再用wizard建立一exe,把ocx加入工程,在dialog上放入两个一样的这个ocx,名字分别叫m_1,m_2,然后写如下程序
void CMy112Dlg::OnOK()
{
m_1.SetData( 100 ); // 第一句
long a = m_2.GetData(); // 第二句
}
运行到第二句后,a=2, 我没有看花眼吧???这是怎么回事啊?有什么办法可以避免这个问题吗?应该ocx中要用到如下的回调函数:
LRESULT CALLBACK WindowProc(
HWND hwnd, // handle to window
UINT uMsg, // message identifier
WPARAM wParam, // first message parameter
LPARAM lParam // second message parameter
);
所以,在函数中,我要有一些参数才能工作的,所以要用到全局变量的,但出现了这样的问题,请问我该怎么解决??up有分
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globaldata不能在m-1,m-2里面共享,
如果要共享的话需要新建立一个共享段,把globaldata放在里面
那么我们在这个类的构造函数中再次初始化你的globaldata=0;应该可以解决吧。
// My555Ctl.cpp : Implementation of the CMy555Ctrl ActiveX Control class.#include "stdafx.h"
#include "555.h"
#include "My555Ctl.h"
#include "My555Ppg.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
IMPLEMENT_DYNCREATE(CMy555Ctrl, COleControl)
long globaldata=0; // 变量在这里申明的/////////////////////////////////////////////////////////////////////////////
// Message mapBEGIN_MESSAGE_MAP(CMy555Ctrl, COleControl)
//{{AFX_MSG_MAP(CMy555Ctrl)
// NOTE - ClassWizard will add and remove message map entries
// DO NOT EDIT what you see in these blocks of generated code !
//}}AFX_MSG_MAP
ON_OLEVERB(AFX_IDS_VERB_PROPERTIES, OnProperties)
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// Dispatch mapBEGIN_DISPATCH_MAP(CMy555Ctrl, COleControl)
//{{AFX_DISPATCH_MAP(CMy555Ctrl)
DISP_FUNCTION(CMy555Ctrl, "GetData", GetData, VT_I4, VTS_NONE)
DISP_FUNCTION(CMy555Ctrl, "SetData", SetData, VT_EMPTY, VTS_I4)
//}}AFX_DISPATCH_MAP
DISP_FUNCTION_ID(CMy555Ctrl, "AboutBox", DISPID_ABOUTBOX, AboutBox, VT_EMPTY, VTS_NONE)
END_DISPATCH_MAP()
/////////////////////////////////////////////////////////////////////////////
// Event mapBEGIN_EVENT_MAP(CMy555Ctrl, COleControl)
//{{AFX_EVENT_MAP(CMy555Ctrl)
// NOTE - ClassWizard will add and remove event map entries
// DO NOT EDIT what you see in these blocks of generated code !
//}}AFX_EVENT_MAP
END_EVENT_MAP()
/////////////////////////////////////////////////////////////////////////////
// Property pages// TODO: Add more property pages as needed. Remember to increase the count!
BEGIN_PROPPAGEIDS(CMy555Ctrl, 1)
PROPPAGEID(CMy555PropPage::guid)
END_PROPPAGEIDS(CMy555Ctrl)
/////////////////////////////////////////////////////////////////////////////
// Initialize class factory and guidIMPLEMENT_OLECREATE_EX(CMy555Ctrl, "MY555.My555Ctrl.1",
0xe10b47da, 0x9f9f, 0x4a1c, 0x9c, 0x37, 0xac, 0x4c, 0x34, 0xf7, 0x78, 0xc4)
/////////////////////////////////////////////////////////////////////////////
// Type library ID and versionIMPLEMENT_OLETYPELIB(CMy555Ctrl, _tlid, _wVerMajor, _wVerMinor)
/////////////////////////////////////////////////////////////////////////////
// Interface IDsconst IID BASED_CODE IID_DMy555 =
{ 0x8e0b7fa5, 0xe19b, 0x4127, { 0xa3, 0xd2, 0x8a, 0x8b, 0x30, 0x3a, 0x8c, 0xeb } };
const IID BASED_CODE IID_DMy555Events =
{ 0x5600eab5, 0xf696, 0x4e54, { 0xb8, 0x81, 0xe, 0x5b, 0xa3, 0xe5, 0xc0, 0xd1 } };
/////////////////////////////////////////////////////////////////////////////
// Control type informationstatic const DWORD BASED_CODE _dwMy555OleMisc =
OLEMISC_SETCLIENTSITEFIRST |
OLEMISC_INSIDEOUT |
OLEMISC_CANTLINKINSIDE |
OLEMISC_RECOMPOSEONRESIZE;IMPLEMENT_OLECTLTYPE(CMy555Ctrl, IDS_MY555, _dwMy555OleMisc)
/////////////////////////////////////////////////////////////////////////////
// CMy555Ctrl::CMy555CtrlFactory::UpdateRegistry -
// Adds or removes system registry entries for CMy555CtrlBOOL CMy555Ctrl::CMy555CtrlFactory::UpdateRegistry(BOOL bRegister)
{
// TODO: Verify that your control follows apartment-model threading rules.
// Refer to MFC TechNote 64 for more information.
// If your control does not conform to the apartment-model rules, then
// you must modify the code below, changing the 6th parameter from
// afxRegApartmentThreading to 0. if (bRegister)
return AfxOleRegisterControlClass(
AfxGetInstanceHandle(),
m_clsid,
m_lpszProgID,
IDS_MY555,
IDB_MY555,
afxRegApartmentThreading,
_dwMy555OleMisc,
_tlid,
_wVerMajor,
_wVerMinor);
else
return AfxOleUnregisterClass(m_clsid, m_lpszProgID);
}
/////////////////////////////////////////////////////////////////////////////
// CMy555Ctrl::CMy555Ctrl - ConstructorCMy555Ctrl::CMy555Ctrl()
{
InitializeIIDs(&IID_DMy555, &IID_DMy555Events); // TODO: Initialize your control's instance data here.
}
/////////////////////////////////////////////////////////////////////////////
// CMy555Ctrl::~CMy555Ctrl - DestructorCMy555Ctrl::~CMy555Ctrl()
{
// TODO: Cleanup your control's instance data here.
}
/////////////////////////////////////////////////////////////////////////////
// CMy555Ctrl::OnDraw - Drawing functionvoid CMy555Ctrl::OnDraw(
CDC* pdc, const CRect& rcBounds, const CRect& rcInvalid)
{
// TODO: Replace the following code with your own drawing code.
pdc->FillRect(rcBounds, CBrush::FromHandle((HBRUSH)GetStockObject(WHITE_BRUSH)));
pdc->Ellipse(rcBounds);
}
/////////////////////////////////////////////////////////////////////////////
// CMy555Ctrl::DoPropExchange - Persistence supportvoid CMy555Ctrl::DoPropExchange(CPropExchange* pPX)
{
ExchangeVersion(pPX, MAKELONG(_wVerMinor, _wVerMajor));
COleControl::DoPropExchange(pPX); // TODO: Call PX_ functions for each persistent custom property.}
/////////////////////////////////////////////////////////////////////////////
// CMy555Ctrl::OnResetState - Reset control to default statevoid CMy555Ctrl::OnResetState()
{
COleControl::OnResetState(); // Resets defaults found in DoPropExchange // TODO: Reset any other control state here.
}
/////////////////////////////////////////////////////////////////////////////
// CMy555Ctrl::AboutBox - Display an "About" box to the uservoid CMy555Ctrl::AboutBox()
{
CDialog dlgAbout(IDD_ABOUTBOX_MY555);
dlgAbout.DoModal();
}
/////////////////////////////////////////////////////////////////////////////
// CMy555Ctrl message handlers// 两个方法在这里long CMy555Ctrl::GetData()
{
return globaldata;
}void CMy555Ctrl::SetData(long data)
{
globaldata = data;
}头文件没有动过,只修改了cpp
// My555Ctl.cpp : Implementation of the CMy555Ctrl ActiveX Control class.#include "stdafx.h"
#include "555.h"
#include "My555Ctl.h"
#include "My555Ppg.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
IMPLEMENT_DYNCREATE(CMy555Ctrl, COleControl)
long globaldata=0; // 变量在这里申明的/////////////////////////////////////////////////////////////////////////////
// Message mapBEGIN_MESSAGE_MAP(CMy555Ctrl, COleControl)
//{{AFX_MSG_MAP(CMy555Ctrl)
// NOTE - ClassWizard will add and remove message map entries
// DO NOT EDIT what you see in these blocks of generated code !
//}}AFX_MSG_MAP
ON_OLEVERB(AFX_IDS_VERB_PROPERTIES, OnProperties)
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// Dispatch mapBEGIN_DISPATCH_MAP(CMy555Ctrl, COleControl)
//{{AFX_DISPATCH_MAP(CMy555Ctrl)
DISP_FUNCTION(CMy555Ctrl, "GetData", GetData, VT_I4, VTS_NONE)
DISP_FUNCTION(CMy555Ctrl, "SetData", SetData, VT_EMPTY, VTS_I4)
//}}AFX_DISPATCH_MAP
DISP_FUNCTION_ID(CMy555Ctrl, "AboutBox", DISPID_ABOUTBOX, AboutBox, VT_EMPTY, VTS_NONE)
END_DISPATCH_MAP()
/////////////////////////////////////////////////////////////////////////////
// Event mapBEGIN_EVENT_MAP(CMy555Ctrl, COleControl)
//{{AFX_EVENT_MAP(CMy555Ctrl)
// NOTE - ClassWizard will add and remove event map entries
// DO NOT EDIT what you see in these blocks of generated code !
//}}AFX_EVENT_MAP
END_EVENT_MAP()
/////////////////////////////////////////////////////////////////////////////
// Property pages// TODO: Add more property pages as needed. Remember to increase the count!
BEGIN_PROPPAGEIDS(CMy555Ctrl, 1)
PROPPAGEID(CMy555PropPage::guid)
END_PROPPAGEIDS(CMy555Ctrl)
/////////////////////////////////////////////////////////////////////////////
// Initialize class factory and guidIMPLEMENT_OLECREATE_EX(CMy555Ctrl, "MY555.My555Ctrl.1",
0xe10b47da, 0x9f9f, 0x4a1c, 0x9c, 0x37, 0xac, 0x4c, 0x34, 0xf7, 0x78, 0xc4)
/////////////////////////////////////////////////////////////////////////////
// Type library ID and versionIMPLEMENT_OLETYPELIB(CMy555Ctrl, _tlid, _wVerMajor, _wVerMinor)
/////////////////////////////////////////////////////////////////////////////
// Interface IDsconst IID BASED_CODE IID_DMy555 =
{ 0x8e0b7fa5, 0xe19b, 0x4127, { 0xa3, 0xd2, 0x8a, 0x8b, 0x30, 0x3a, 0x8c, 0xeb } };
const IID BASED_CODE IID_DMy555Events =
{ 0x5600eab5, 0xf696, 0x4e54, { 0xb8, 0x81, 0xe, 0x5b, 0xa3, 0xe5, 0xc0, 0xd1 } };
/////////////////////////////////////////////////////////////////////////////
// Control type informationstatic const DWORD BASED_CODE _dwMy555OleMisc =
OLEMISC_SETCLIENTSITEFIRST |
OLEMISC_INSIDEOUT |
OLEMISC_CANTLINKINSIDE |
OLEMISC_RECOMPOSEONRESIZE;IMPLEMENT_OLECTLTYPE(CMy555Ctrl, IDS_MY555, _dwMy555OleMisc)
/////////////////////////////////////////////////////////////////////////////
// CMy555Ctrl::CMy555CtrlFactory::UpdateRegistry -
// Adds or removes system registry entries for CMy555CtrlBOOL CMy555Ctrl::CMy555CtrlFactory::UpdateRegistry(BOOL bRegister)
{
// TODO: Verify that your control follows apartment-model threading rules.
// Refer to MFC TechNote 64 for more information.
// If your control does not conform to the apartment-model rules, then
// you must modify the code below, changing the 6th parameter from
// afxRegApartmentThreading to 0. if (bRegister)
return AfxOleRegisterControlClass(
AfxGetInstanceHandle(),
m_clsid,
m_lpszProgID,
IDS_MY555,
IDB_MY555,
afxRegApartmentThreading,
_dwMy555OleMisc,
_tlid,
_wVerMajor,
_wVerMinor);
else
return AfxOleUnregisterClass(m_clsid, m_lpszProgID);
}
/////////////////////////////////////////////////////////////////////////////
// CMy555Ctrl::CMy555Ctrl - ConstructorCMy555Ctrl::CMy555Ctrl()
{
InitializeIIDs(&IID_DMy555, &IID_DMy555Events); // TODO: Initialize your control's instance data here.
}
/////////////////////////////////////////////////////////////////////////////
// CMy555Ctrl::~CMy555Ctrl - DestructorCMy555Ctrl::~CMy555Ctrl()
{
// TODO: Cleanup your control's instance data here.
}
/////////////////////////////////////////////////////////////////////////////
// CMy555Ctrl::OnDraw - Drawing functionvoid CMy555Ctrl::OnDraw(
CDC* pdc, const CRect& rcBounds, const CRect& rcInvalid)
{
// TODO: Replace the following code with your own drawing code.
pdc->FillRect(rcBounds, CBrush::FromHandle((HBRUSH)GetStockObject(WHITE_BRUSH)));
pdc->Ellipse(rcBounds);
}
/////////////////////////////////////////////////////////////////////////////
// CMy555Ctrl::DoPropExchange - Persistence supportvoid CMy555Ctrl::DoPropExchange(CPropExchange* pPX)
{
ExchangeVersion(pPX, MAKELONG(_wVerMinor, _wVerMajor));
COleControl::DoPropExchange(pPX); // TODO: Call PX_ functions for each persistent custom property.}
/////////////////////////////////////////////////////////////////////////////
// CMy555Ctrl::OnResetState - Reset control to default statevoid CMy555Ctrl::OnResetState()
{
COleControl::OnResetState(); // Resets defaults found in DoPropExchange // TODO: Reset any other control state here.
}
/////////////////////////////////////////////////////////////////////////////
// CMy555Ctrl::AboutBox - Display an "About" box to the uservoid CMy555Ctrl::AboutBox()
{
CDialog dlgAbout(IDD_ABOUTBOX_MY555);
dlgAbout.DoModal();
}
/////////////////////////////////////////////////////////////////////////////
// CMy555Ctrl message handlers// 两个方法在这里long CMy555Ctrl::GetData()
{
return globaldata;
}void CMy555Ctrl::SetData(long data)
{
globaldata = data;
}头文件没有动过,只修改了cpp
m_1.SetData( 100 ); // 第一句
long a = m_2.GetData(); // 第二句
a读出来为100,结果是对的。Win2k+VC6下globaldata 为全局变量,而ocx是dll,是进程内对象,多个ocx是共享一个进程空间的,所以两个对象的globaldata是同一地址单无,结果为100才用。楼主看看你哪儿搞错了。建立一个共享段是进程间共享数据才用的方法。
long globaldata=0; // 变量在这里申明的
的声明放在头文件类里面。