Question

MFC 两个复选框全选正常 但是只选择一个就总报错 TODO:出现了一个问题 导致程序停止正常工作

CString qita = NULL; CButton *pBtn1 = (CButton*)GetDlgItem(n_nStudent); int Stdstate = 1; Stdstate = pBtn1->GetCheck();CButton *pBtn2 = (CButton*)GetDlgItem(n_nSCC); int SCCstate = 1; SCCstate = pBtn2->GetCheck(); if(0 == SCCstate && 1 == Stdstate) qita = "学生会干部"; else if(1 == Stdstate && 0 == Stdstate) qita = "班干部"; else if(0 == Stdstate && 0 == SCCstate) qita = "班干部；学生会干部"; else qita = " ";

Answer 1

应该不是复选框的问题，查查GROUP属性跟对应变量名

追问

跟变量名有什么关系呢?? 我的代码如在上面 麻烦你看下是不是代码有问题 MFC初学 真的头大阿

追答

1, CString qita = NULL; // 不能这样初始化，改为CString qita; 就行
2,如果n_nStudent,n_nSCC，这2个是复选框的ID的话，就没有问题了，能正确运行。
3，

if(0 == SCCstate && 1 == Stdstate)
else if(1 == SCCstate && 0 == Stdstate) // 不是同一个变量
else if(1 == Stdstate && 1 == SCCstate) // 你的原意应该是这个，2个都选中
else qita = " ";

追问

网上的:CButton* pBtn = (CButton*)GetDlgItem(IDC_CHECK); int state = pBtnNONE->GetCheck();　当state == 1时表示该复选框没有被选中；当state == 0时表示该复选框被选中； CString qita = NULL;改为 CString qita; 问题依然存在呢

追答

1，IDC_CHECK 就是 复选框的ID （n_nStudent,n_nSCC这也可以是ID的）

2，当state == 1时表示该复选框没有被选中；当state == 0时表示该复选框被选中；

这是不是反了？

追问

谢谢你的回答 成功了 呵呵 n_nStudent,n_nSCC这两个是我设置的相应变量 ，顺便问下为什么设置变量放到GetDlgItem（）里面不可以呢？？？

追答

CWnd::GetDlgItem

Retrieves a pointer to the specified control or child window in a dialog box or other window.
CWnd* GetDlgItem(
int nID
) const;
void GetDlgItem(
int nID,
HWND* phWnd
) const;

Parameters

nID
Specifies the identifier of the control or child window to be retrieved.
phWnd
A pointer to a child window.
Return Value

A pointer to the given control or child window. If no control with the integer ID given by the nID parameter exists, the value is NULL.
The returned pointer may be temporary and should not be stored for later use.
Remarks

The pointer returned is usually cast to the type of control identified by nID.
Example

C++
// uses GetDlgItem to return a pointer to a user interface control
CEdit* pBoxOne;
pBoxOne = (CEdit*)GetDlgItem(IDC_MYEDIT);
GotoDlgCtrl(pBoxOne);

Requirements

Header: afxwin.h