SendMessage(hWnd, Msg, wParam, lParam) 困难 [英] SendMessage(hWnd, Msg, wParam, lParam) difficulties

问题描述

我试图让一个程序点击另一个程序上的按钮；我决定使用该功能:

I am trying to make a program click a button on another program; I decided to use the function:

SendMessage(hWndVariable, MsgVariable, wParamVariable, lParamVariable)

但是有一个问题.带有窗口句柄 hWndVariable 的窗口有 3 个按钮.我最初计划在 SendMessage 函数中使用以下参数:

but there is an issue. The window with the window handle hWndVariable has 3 buttons. I initially planned to use the following parameters in the SendMessage function:

SendMessage(hWndVariable, BN_CLICK, 0, 0);

问题:: 但是由于有 3 个按钮，程序如何知道正在单击哪个按钮?大声笑我猜我要么错过了什么，要么做错了什么.

Question:: but since there are 3 buttons, how would the program know which one is being clicked? lol I am guessing that I am either missing something or doing something completely wrong.

推荐答案

SendMessage(hWndVariable, BN_CLICK, 0, 0);

SendMessage(hWndVariable, BN_CLICK, 0, 0);

这就是你的问题.首先，您发送的是一条不存在的消息(您的意思是 BN_CLICKED).其次，您没有正确发送消息.

This is your problem right here. First, you're sending a nonexistent message (you meant BN_CLICKED). Second, you're not sending the message correctly.

如之前问题的答案所述，您需要获取按钮的 ID.您可以使用 Spy++ 执行此操作.

As described in answers to your previous questions, you need to get the button's ID. You can do this using Spy++.

然后，根据 BN_CLICKED 文档，您可以像这个一样发送您的消息:

Then, per the BN_CLICKED documentation, you can send your message like this:

SendMessage(parentWindowhWnd, WM_COMMAND, (BN_CLICKED << 16) | BUTTONID, buttonhWnd);

适当填写值 - parentWindowhWnd 是包含按钮的窗口的 HWND，BUTTONID 是按钮的 ID，buttonhWnd 是按钮本身的 HWND.

Fill in the values appropriately - parentWindowhWnd is the HWND of the window containing the button, BUTTONID is the button's ID, and buttonhWnd is the HWND of the button itself.

这篇关于SendMessage(hWnd, Msg, wParam, lParam) 困难的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！