我可以从对话框的DoModal函数返回自定义值吗？ [英] Can I return a custom value from a dialog box's DoModal function?

问题描述

我想做的是，在使用 DoModal（）创建一个对话框，然后在框中按确定退出，返回一个自定义值。例如，用户在对话框中输入的几个字符串。

What I wish to do is, after creating a dialog box with DoModal() and pressing OK in the box to exit it, to have a custom value returned. For example, a couple of strings the user would input in the dialog.

推荐答案

您不能更改 DoModal（）函数，即使你可以，我不会推荐它。这不是惯用的方式，如果你将它的返回值更改为字符串类型，你将失去看到用户取消对话框的能力（在这种情况下，返回的字符串值

You can't change the return value of the DoModal() function, and even if you could, I wouldn't recommend it. That's not the idiomatic way of doing this, and if you changed its return value to a string type, you would lose the ability to see when the user canceled the dialog (in which case, the string value returned should be ignored altogether).

而是添加另一个函数（或多个）到你的对话框类，例如 GetUserName（）和 GetUserPassword ，然后查询 DoModal 后返回 IDOK 。

Instead, add another function (or multiple) to your dialog box class, something like GetUserName() and GetUserPassword, and then query the values of those functions after DoModal returns IDOK.

例如，显示对话框并处理用户输入的函数可能如下所示：

For example, the function that shows the dialog and processes user input might look like this:

void CMainWindow::OnLogin()
{
    // Construct the dialog box passing the ID of the dialog template resource
    CLoginDialog loginDlg(IDD_LOGINDLG);

    // Create and show the dialog box
    INT_PTR nRet = -1;
    nRet = loginDlg.DoModal();

    // Check the return value of DoModal
    if (nRet == IDOK)
    {
        // Process the user's input
        CString userName = loginDlg.GetUserName();
        CString password = loginDlg.GetUserPassword();

        // ...
    }
}

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