MFC ComBox控件相关使用案例

1、ComBox控件中下拉框内容从文件中读取

　　首先在工具箱中拖拽ComBox控件到对话框中，ID为IDC_COMBO_Model，同时在工程目录下创建一个名字为ModelInfo文件，在CcomBoxTestDlg.h文件中申明函数 void AddModelToComboBox();接着在CcomBoxTestDlg.cpp文件中实现AddModelToComboBox()函数，实现内容如下：

 1 void CcomBoxTestDlg::AddModelToComboBox() {
 2     CComboBox* pCombo = (CComboBox*)this->GetDlgItem(IDC_COMBO_Model);
 3     pCombo->ResetContent();
 4     CString model_path = _T(".\ModelInfo");
 5     CStdioFile file;
 6     if (file.Open(model_path, CFile::modeRead | CFile::shareDenyNone))
 7     {
 8         while (TRUE)
 9         {
10             CString str;
11             if (!file.ReadString(str))
12             {
13                 break;
14             }
15             CString model_name = str.SpanExcluding(_T(","));//SpanIncluding()
16             model_name.TrimLeft(_T(" "));
17             model_name.TrimRight(_T(" "));
18             if (model_name == _T(""))
19             {
20                 continue;
21             }
22             if (pCombo->FindStringExact(-1, model_name) == CB_ERR)
23             {/*
24                 CComboBox::FindStringExact
25                 int FindStringExact(int nIndexStart,LPCTSTR lpszFind) const;
26                 当第一个参数为-1时，则表示查询整个列表框的项目
27                 列表中有字符串model_name返回值为0
28                 列表中没有字符串model_name返回值为-1    CB_ERR代表-1
29              */
30                 pCombo->AddString(model_name);
31             }
32         }
33         file.Close();
34     }
35 }

View Code

　　最后在OnInitDialog()中添加this->AddModelToComboBox()调用此函数。文件内容及运行效果如下所示：

 1 void CcomBoxTestDlg::AddModelToComboBox() {
 2     ((CComboBox*)this->GetDlgItem(IDC_COMBO_Model))->ResetContent();
 3     CStdioFile file;
 4     int tmpFinder = 0;
 5     if (file.Open(_T(".\ModelInfo"), CFile::modeRead | CFile::shareDenyNone)) {
 6         CString tmp;
 7         while (file.ReadString(tmp)) {
 8             if (tmp.Find(_T("ModelName")) != -1) {
 9                 tmpFinder = 1;
10             }
11             if (tmpFinder == 1) {
12                 if (tmp.Find(_T("=")) != -1) {
13                     int postion = tmp.Find(_T("="));
14                     CString model_tmp = tmp;
15                     CString modelstr;
16                     modelstr = model_tmp.Left(postion);
17                     ((CComboBox*)this->GetDlgItem(IDC_COMBO_Model))->AddString(modelstr);
18                 }
19             }
20         }
21         file.Close();
22     }
23 }

View Code

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原文地址：https://www.cnblogs.com/geziyu/p/14086722.html