先上代码
CString ss = "打卡系统--主界面";
CWnd *pwnd = FindWindow(NULL,ss); //希望找到资源管理器
HWND hwndParent = pwnd->GetSafeHwnd(); //得到父窗口的HWND
ss = "print";
pwnd = FindWindowEx(hwndParent,NULL,ss,NULL);
HWND hwnd = pwnd->GetSafeHwnd();
::PostMessage(hwnd, WM_USER_INPUTMSG_OK, 0, (LPARAM)&merchant);