error C2440: “static_cast”: 无法从“void (__thiscall CChatDlg::* )(WPARAM,LPARAM)”转换为“LRESULT
2013-12-21 16:35
435 查看
error C2440: “static_cast”: 无法从“void (__thiscall CChatDlg::* )(WPARAM,LPARAM)”转换为“LRESULT (__thiscall CWnd::* )(WPARAM,LPARAM)”
1> 从基类型到派生类型的强制转换需要 dynamic_cast 或 static_cast
搜索发现为开发平台迁移问题。
由vc6.0升级至vs2005以上平台均会遇到这情况,原因为
VS2005对消息的检查更为严格,以前在VC6下完全正常运行的消息映射在VS2005下编译不通过
// 生成的消息映射函数
virtual BOOL OnInitDialog();
afx_msg void OnSysCommand(UINT nID, LPARAM lParam);
afx_msg void OnPaint();
afx_msg HCURSOR OnQueryDragIcon();
afx_msg void OnRecvData(WPARAM wParam, LPARAM lParam);
DECLARE_MESSAGE_MAP()
BEGIN_MESSAGE_MAP(CChatDlg, CDialog)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
//}}AFX_MSG_MAP
ON_EN_CHANGE(IDC_EDIT_RECV, &CChatDlg::OnEnChangeEditRecv)
ON_BN_CLICKED(IDC_BTN_SEND, &CChatDlg::OnBnClickedBtnSend)
ON_MESSAGE(WM_RECVDATA, &CChatDlg::OnRecvData)
END_MESSAGE_MAP()
编译错误提示:
error C2440: “static_cast”: 无法从“void (__thiscall CChatDlg::* )(WPARAM,LPARAM)”转换为“LRESULT (__thiscall CWnd::* )(WPARAM,LPARAM)”
1> 从基类型到派生类型的强制转换需要 dynamic_cast 或 static_cast
更改定义:
afx_msg void OnRecvData(WPARAM wParam, LPARAM lParam);
为
afx_msg LRESULTOnRecvData(WPARAM wParam, LPARAM lParam);
另外,在实现函数末尾添加return true;
编译通过
LRESULT是一个数据类型,
MSDN: 32-bit value returned from a window procedure or callback function
指的是从窗口程序或者回调函数返回的32位值。
1> 从基类型到派生类型的强制转换需要 dynamic_cast 或 static_cast
搜索发现为开发平台迁移问题。
由vc6.0升级至vs2005以上平台均会遇到这情况,原因为
VS2005对消息的检查更为严格,以前在VC6下完全正常运行的消息映射在VS2005下编译不通过
// 生成的消息映射函数
virtual BOOL OnInitDialog();
afx_msg void OnSysCommand(UINT nID, LPARAM lParam);
afx_msg void OnPaint();
afx_msg HCURSOR OnQueryDragIcon();
afx_msg void OnRecvData(WPARAM wParam, LPARAM lParam);
DECLARE_MESSAGE_MAP()
BEGIN_MESSAGE_MAP(CChatDlg, CDialog)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
//}}AFX_MSG_MAP
ON_EN_CHANGE(IDC_EDIT_RECV, &CChatDlg::OnEnChangeEditRecv)
ON_BN_CLICKED(IDC_BTN_SEND, &CChatDlg::OnBnClickedBtnSend)
ON_MESSAGE(WM_RECVDATA, &CChatDlg::OnRecvData)
END_MESSAGE_MAP()
编译错误提示:
error C2440: “static_cast”: 无法从“void (__thiscall CChatDlg::* )(WPARAM,LPARAM)”转换为“LRESULT (__thiscall CWnd::* )(WPARAM,LPARAM)”
1> 从基类型到派生类型的强制转换需要 dynamic_cast 或 static_cast
更改定义:
afx_msg void OnRecvData(WPARAM wParam, LPARAM lParam);
为
afx_msg LRESULTOnRecvData(WPARAM wParam, LPARAM lParam);
另外,在实现函数末尾添加return true;
编译通过
LRESULT是一个数据类型,
MSDN: 32-bit value returned from a window procedure or callback function
指的是从窗口程序或者回调函数返回的32位值。
相关文章推荐
- error C2440: “static_cast”: 无法从“void (__thiscall CChatDlg::* )(WPARAM,LPARAM)”转换为“LRESULT (__thisca
- error C2440: “static_cast”: 无法从“void (__thiscall CChatDlg::* )(WPARAM,LPARAM)”转换为“LRESULT (__thiscal
- error C2440: “static_cast”: 无法从“void (__thiscall CChatDlg::* )(WPARAM,LPARAM)”转换为“LRE
- error C2440: “static_cast”: 无法从“void (__thiscall CChatDlg::* )(WPARAM,LPARAM)”转换为“LRE
- error C2440: “static_cast”: 无法从“void (__thiscall CTransparentWnd::* )(WPARAM,LPARAM)”转换为“LRESULT (__
- error C2440: “static_cast”: 无法从“void (__thiscall CMYQQDlg::* )(WPARAM,LPARAM)”转换为“LRESULT (__th
- error C2440: “static_cast”: 无法从“void (__thiscall CXPButton::* )(WPARAM,LPARAM)”转换为“LRESULT (__thisca
- 2440: “static_cast”: 无法从“void (__thiscall CMainDlg::* )(WPARAM,LPARAM)”转换为“LRESULT (__thiscall CWnd:
- 错误 1 error C2440: “static_cast”: 无法从“void (__thiscall CTCPDlg::* )(WPARAM,LPARAM)”转换为“LRESULT (__thiscall CWnd::* )(WPARAM,LPARAM)” 解决问题
- 【转】error C2440 “static_cast” 无法从“void (__thiscall CPppView )(void)”转换为“LRESULT (__thiscall CWnd )(WPARAM,LPARAM)”
- error C2440: “static_cast”: 无法从“void (__thiscall CPppView::* )(WPARAM,LPARAM)”转换为“LRESULT (__thiscal
- error C2440: “static_cast”: 无法从“void (__thiscall CChatDlg::* )(WPARAM,LPARAM)
- error C2440: 'static_cast' : cannot convert from 'void (__thiscall CChatDlg::* )(WPARAM,LPARAM)' to
- “static_cast”: 无法从“void (__thiscall CMyNetChatDlg::* )(WPARAM,LPARAM)”转换为“LRESULT (__thiscall CWnd::* )(WPARAM,LPARAM)”
- : error C2440: “static_cast”: 无法从“void (__thiscall CBCGPInformationBar::* )(WPARAM,LPARAM)”转换为“LRESU
- error C2440: 'static_cast' : cannot convert from 'void (__thiscall CChatDlg::* )(WPARAM,LPARAM)' to
- error C2440 “static_cast” 无法从“void (__thiscall CPppView )(void)”转换为“LRESULT (__thiscall CWnd )(WPARAM,LPARAM)”
- error C2440: “static_cast”: 无法从“void (__thiscall CXXDlg* )(void)”转换为“LRESULT (__thiscall CWnd:的错误
- error C2440: “static_cast”: 无法从“LRESULT (__thiscall CTextProgressCtrl::* )(UINT,LPCTSTR)”转换为“LRESULT (__thiscall CWnd::* )(WPARAM,LPARAM)
- error C2440: 'static_cast' : cannot convert from 'void (__thiscall CChatDlg::* )(WPARAM,LPARAM)' to