I have a program that needs to send the BM_CLICK message to another applications button. I can get the parent window handle but when I try to get the button handle if开发者_JAVA百科 always returns 0
I got the button caption name and button type from Spy++ it seems right but I know I must have gotten something wrong. below is my code
public const Int BM_CLICK = 0x00F5;
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr SendMessage(IntPtr hwnd, uint Msg, IntPtr wParam, IntPtr lParam);
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);
private void button1_Click(object sender, EventArgs e)
{
Process[] processes = Process.GetProcessesByName("QSXer");
foreach (Process p in processes)
{
////the Button's Caption is "Send" and it is a "Button".
IntPtr ButtonHandle = FindWindowEx(p.MainWindowHandle, IntPtr.Zero, "Button", "Send");
//ButtonHandle is always zero thats where I think the problem is
SendMessage(ButtonHandle, BM_CLICK, IntPtr.Zero, IntPtr.Zero);
}
}
Spy screen shot
Try to pass null for the window text and instead try to find any button:
IntPtr ButtonHandle = FindWindowEx(p.MainWindowHandle, IntPtr.Zero, "Button", null);
After that you can use the second parameter and a new call to get the next button handle a couple more times.
Also could you please try checking Marshal.GetLastWin32Error
to see what the error result is?
Try this:
IntPtr ButtonHandle = FindWindowEx(p.MainWindowHandle, IntPtr.Zero, null, "Send");
You can do somthing like this:
//Program finds a window and looks for button in window and clicks it
HWND buttonHandle = 0;
BOOL CALLBACK GetButtonHandle(HWND handle, LPARAM)
{
char label[100];
int size = GetWindowTextA(handle, label, sizeof(label));
if (strcmp(label, "Send") == 0) // your button name
{
buttonHandle = handle;
cout << "button id is: " << handle << endl;
return false;
}
return true;
}
int main()
{
HWND windowHandle = FindWindowA(NULL, "**Your Window Name**");
if (windowHandle == NULL)
{
cout << "app isn't open." << endl;
}
else
{
cout << "app is open :) " << endl;
cout << "ID is: " << windowHandle << endl;
SetForegroundWindow(windowHandle);
BOOL ret = EnumChildWindows(windowHandle, GetButtonHandle, 0); //find the button
cout << buttonHandle << endl;
if (buttonHandle != 0)
{
LRESULT res = SendMessage(buttonHandle, BM_CLICK, 0, 0);
}
}
}
This should do the trick.
Try to build project as x86. I try and successed!
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