Question

如何使用mfc在指定窗口输入输出

Answer 1

获取选定窗口句柄，然后就可以调用输入输出函数了

Answer 2

void CQq1Dlg::OnButton1()
{
// TODO: Add your control notification handler code here
UpdateData(TRUE);
CString strMsg;
GetDlgItem(IDC_EDIT1)->GetWindowText(strMsg);
HWND hWnd = ::FindWindow(NULL,"dialogText");//第二个参数为另一个对话框的标题
CDialog1* dlg = (CDialog1*)CWnd::FromHandle(hWnd);
dlg->GetDlgItem(IDC_EDIT1)->SetWindowText(strMsg);