单选按钮单击另一个窗体

我们有一个带有GUI的遗留程序,我们想在C程序的控制下使用它来计算一些值。我们可以成功地在数字输入控件中输入值,按下计算按钮,并从文本显示框中读取生成的答案。

但是 我们似乎无法控制一对单选按钮。

发送BM\u CLICK消息不会更改状态。

有人成功地“遥控”单选按钮吗?

部分代码来说明我们在做什么:

[DllImport("user32.dll", EntryPoint="SendMessage")]
public static extern int SendMessageStr(int hWnd, uint Msg, int wParam, string lParam);

[DllImport("user32.dll")]
public static extern int SendMessage(int hWnd, uint Msg, long wParam, long lParam);

[DllImport("user32.dll", EntryPoint="FindWindow", SetLastError=true)]
static extern IntPtr FindWindowByCaption(IntPtr ZeroOnly, string lpWindowName);

[DllImport("user32.dll", EntryPoint="CheckRadioButton")]
public static extern bool CheckRadioButton(IntPtr hwnd, int firstID, int lastID, int checkedID);

static IntPtr GetControlById(IntPtr parentHwnd, int controlId) {
  IntPtr child = new IntPtr(0);
  child = GetWindow(parentHwnd, GetWindow_Cmd.GW_CHILD);
  while (GetWindowLong(child.ToInt32(), GWL_ID) != controlId) {
    child = GetWindow(child, GetWindow_Cmd.GW_HWNDNEXT);
    if (child == IntPtr.Zero) return IntPtr.Zero;
  }
  return child;
}

// find the handle of the parent window
IntPtr ParenthWnd = new IntPtr(0);    
ParenthWnd = FindWindowByCaption(IntPtr.Zero, "Legacy Window Title");

// set "N" to 10
IntPtr hwndN = GetControlById(ParenthWnd, 17);
SendMessageStr(hwndN.ToInt32(), WM_SETTEXT, 0, "10");

// press "compute" button (seems to need to be pressed twice(?))
int hwndButton = GetControlById(ParenthWnd, 6).ToInt32();
SendMessage(hwndButton, BM_CLICK, 0, 0);
SendMessage(hwndButton, BM_CLICK, 0, 0);

// following code runs succesfully, but doesn't toggle the radio buttons
bool result = CheckRadioButton(ParenthWnd, 12, 13, 12);