VC2005 lparam转换为CString编译错误 [英] VC2005 lparam converted to CString compile error

问题描述

CString str =(char *)lParam; //VC2005 unicode中存在编译错误


如果不使用unicode，则没有编译错误.
使用Unicode，如何将(char *)lParam"转换为"CString"

这是我的原始代码...

void CChatbotDlg :: OnBnClickedButton1()
{
//TODO:
CString strSend;
GetDlgItemText(IDC_EDIT2，strSend);
if(strSend.GetLength()> 0)
{
char tempBuf [256];
sprintf(tempBuf，"U:％s"，strSend);
:: PostMessage(this-> m_hWnd，WM_RECVDATA，0，(LPARAM)tempBuf);
}
SetDlgItemText(IDC_EDIT2，_T(")));
}


LRESULT CChatbotDlg :: OnRecvData(WPARAM wParam，LPARAM lParam)
{
CString str =(字符*)lParam; //编译错误！
CString strTemp;
GetDlgItemText(IDC_EDIT1，strTemp);
strTemp + ="\ r \ n";
strTemp + = str;
SetDlgItemText(IDC_EDIT1，strTemp);
返回0;
}

解决方案

我终于找到了...
正确的代码是...

void CChatbotDlg :: OnBnClickedButton1()
{
//TODO:
CString strSend;
GetDlgItemText(IDC_EDIT2，strSend);
if(strSend.GetLength()> 0)
{
wchar_t * tempBuf =新的wchar_t [256];
swprintf_s(tempBuf，256，_T("U:％s")，strSend);
:: PostMessage(this-> m_hWnd，WM_RECVDATA，0，(LPARAM)tempBuf);
}
SetDlgItemText(IDC_EDIT2，_T(")));
}

LRESULT CChatbotDlg :: OnRecvData(WPARAM wParam，LPARAM lParam)
{
CString str =(wchar_t *)lParam;
CString strTemp;
GetDlgItemText(IDC_EDIT1，strTemp);
strTemp + ="\ r \ n";
strTemp + = str;
SetDlgItemText(IDC_EDIT1，strTemp);
返回0;
}

zop123写道:

=(char *)lParam; //VC2005 unicode中存在编译错误

有什么错误?也许您需要使用TCHAR?我相信CString类可以将自身转换为unicode构建的unicode类，如果确实是unicode构建中的char *，则可以使用_bstr_t进行转换(因此，TCHAR显然会破坏它). /blockquote>

CString str=(char *)lParam; //there is a compile error in VC2005 unicode


if not using unicode , there is no compile error.
Using unicode, how to convert "(char *)lParam" to "CString"

here is my original code...

void CChatbotDlg::OnBnClickedButton1()
{
// TODO:
CString strSend;
GetDlgItemText(IDC_EDIT2,strSend);
if(strSend.GetLength()>0)
{
char tempBuf[256];
sprintf(tempBuf,"U:%s",strSend);
::PostMessage(this->m_hWnd,WM_RECVDATA,0,(LPARAM)tempBuf);
}
SetDlgItemText(IDC_EDIT2,_T(""));
}


LRESULT CChatbotDlg::OnRecvData(WPARAM wParam, LPARAM lParam)
{
CString str=(char *)lParam; // compile error!
CString strTemp;
GetDlgItemText(IDC_EDIT1,strTemp);
strTemp+="\r\n";
strTemp+=str;
SetDlgItemText(IDC_EDIT1,strTemp);
return 0;
}

解决方案

I finally find it...
The correct code is...

void CChatbotDlg::OnBnClickedButton1()
{
// TODO:
CString strSend;
GetDlgItemText(IDC_EDIT2,strSend);
if(strSend.GetLength()>0)
{
wchar_t *tempBuf=new wchar_t[256];
swprintf_s(tempBuf,256,_T("U:%s"),strSend);
::PostMessage(this->m_hWnd,WM_RECVDATA,0,(LPARAM)tempBuf);
}
SetDlgItemText(IDC_EDIT2,_T(""));
}

LRESULT CChatbotDlg::OnRecvData(WPARAM wParam, LPARAM lParam)
{
CString str=(wchar_t* )lParam;
CString strTemp;
GetDlgItemText(IDC_EDIT1,strTemp);
strTemp+="\r\n";
strTemp+=str;
SetDlgItemText(IDC_EDIT1,strTemp);
return 0;
}

zop123 wrote:

=(char *)lParam; //there is a compile error in VC2005 unicode

What is the error ? Perhaps you need to use TCHAR ? I believe that the CString class turns itself into a unicode class for unicode builds, you could use _bstr_t to do a conversion for you, if this is indeed a char * in a unicode build ( so, then TCHAR would break it obviously ).

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