如何通过 WinAPI 在外部应用程序中滚动滚动条? [英] How to scroll the scrollbar in external application via WinAPI?

问题描述

说明

我正在尝试使用 TestComplete 测试在 Delphi 中编码的应用程序(DevEx 的 VCL 组件).应用程序是在没有调试信息的情况下构建的.

I'm trying to test application coded in Delphi (VCL components by DevEx) with TestComplete. Application is built without debug info.

我需要滚动 TcxTreeList 组件.问题是当我为此组件的滚动条设置 Position 属性时，内容未滚动但滚动条位置发生变化.我尝试了很多方法，并认为 WinAPI 可以帮助我.

I need to scroll TcxTreeList component. The problem is when I set Position property for this component's scrollbars content is not scrolled but scroll bar position changes. I tried a lot of approaches and suppose that WinAPI can help me.

问题:

如何通过WinAPI在外部应用中滚动滚动条?

找到了PostMessage函数，但是不知道怎么合成WM_SCROLL消息...

I found PostMessage function, but I do not know how to synthesize WM_SCROLL message...

推荐答案

向下滚动一行(你可以在 JustBoo 提到的页面看到其他常量)；

Scroll one line down (you can see other constants at the page JustBoo mentions);

PostMessage(HWnd, WM_VSCROLL, SB_LINEDOWN, 0)

滚动到特定位置；

PostMessage(HWnd, WM_VSCROLL, MakeWParam(SB_THUMBPOSITION, 30), 0)

但如果您参考 此页面在 Devex 论坛上，有人提到cxTreeList中的ScrollBar是另一个控件，不是标准的windows滚动条".所以它可能不起作用.在这种情况下，您可能想尝试 ScrollWindowEx 再加上像你已经做的那样设置位置.

But if you refer to this page on the Devex forums, it is mentioned that "ScrollBar in the cxTreeList it is another control, not standard windows scrollbar". So it might not work. In this case you might want to try ScrollWindowEx coupled with setting the position as you already do.

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