MFC关于对话框之间传值的问题,使用的 GetParent()函数,CString的变量传递后显示错误的指针,其余类型的变量传值正确
lyymd 2016-08-19 02:41:27 基于对话框建立的工程,基本框架流程是主对话框A按钮弹出对话框B,对话框B用Tab控件关联三个对话框窗口统称C。现在C上面需要A上的变量的值,编译成功运行后点按钮报错,错误中断后停的代码如下(停在最里面的if语句上):
CSimpleStringT& operator=(_In_ const CSimpleStringT& strSrc)
{
CStringData* pSrcData = strSrc.GetData();
CStringData* pOldData = GetData();
if( pSrcData != pOldData)
{
if( pOldData->IsLocked() || pSrcData->pStringMgr != pOldData->pStringMgr )
{
SetString( strSrc.GetString(), strSrc.GetLength() );
}
else
{
CStringData* pNewData = CloneData( pSrcData );
pOldData->Release();
Attach( pNewData );
}
}
return( *this );
}
觉得应该是CString的问题,逐步运行后发现用GetParent()指针传值里面CString类型的值无法传值,下面是摘选的程序一直运行到错误处的代码:
这是主窗口A
CTry04Dlg::CTry04Dlg(CWnd* pParent /*=NULL*/)
: CDialogEx(CTry04Dlg::IDD, pParent)
{
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
//从注册表读取当前串口设置
LoadConfigFromRegistry();
m_ECGMode = 1;
m_ECGGain = 2;
m_RESPGain = 2;
m_ECGCmd = 3;
m_NIBPMode = 0;
m_PresetPress = 150;
m_PressBias = 0;
m_IsECGTest = false;
m_IsNIBPTest = false;
m_IsSPO2Test = false;
m_IsTEMPTest = false;
}
void CTry04Dlg::LoadConfigFromRegistry(void)
{
CString key;
CString port, baudrate, bits, parity, stop;
key = "Port";
port = theApp.GetProfileString(CONFIG_SECTION, key, "COM1");
port.TrimLeft("COM");
m_CommPort = atoi(port);
if (m_CommPort < 0 || m_CommPort >= 100)
{
MessageBox("Read RegistryKey(\"Port\") error, Port=%s", port);
m_CommPort = 1;
}
key = "BaudRate";
baudrate = theApp.GetProfileString(CONFIG_SECTION, key, "115200");
key = "DataBits";
bits = theApp.GetProfileString(CONFIG_SECTION, key, "8");
key = "ParityBits";
parity = theApp.GetProfileString(CONFIG_SECTION, key, "n");
key = "StopBits";
stop = theApp.GetProfileString(CONFIG_SECTION, key, "1");
m_CommParam = baudrate + "," + parity + "," + bits + "," + stop;
// m_CommParam = _T("233333");
}
这是子窗口C
BOOL CMonitorComSet::OnInitDialog()
{
int port;
CString param;
CString baudrate;
CString paritybit;
CString databit;
CString stopbit;
CString str;
int i;
CTry04Dlg* p;
p = (CTry04Dlg *)GetParent();
port = p ->m_CommPort;
param = p ->m_CommParam;
// port = ((CTry04Dlg *)GetParent())->m_CommPort;
// param = ((CTry04Dlg *)GetParent())->m_CommParam;
AfxExtractSubString(baudrate, param, 0, ',');
AfxExtractSubString(paritybit, param, 1, ',');
AfxExtractSubString(databit, param, 2, ',');
AfxExtractSubString(stopbit, param, 3, ',');
CDialog::OnInitDialog();
}
m_CommParam的传值出现问题,对话框A中可以看到m_CommParam的值正确读进去了的,但是到了C查看指针p的值,其余变量都正常
- m_CommParam <错误的指针> ATL::CStringT<char,StrTraitMFC_DLL<char,ATL::ChTraitsCRT<char> > >
- ATL::CSimpleStringT<char,1> <错误的指针> ATL::CSimpleStringT<char,1>
- m_pszData 0x00000000 <错误的指针> char *
CXX0030: 错误: 无法计算表达式的值
然后又试了其他的值,比如m_CommParam = _T("233333");。。。还是乱码。求问各大神这个问题该怎么办啊???快疯了我