RegisterPointerInputTarget不消耗所有输入 [英] RegisterPointerInputTarget not consuming all input
问题描述
我正在Windows 10中工作，我试图编写一个C ++程序来拦截所有触摸屏输入，但是某些输入仍在通过.
I'm working in Windows 10 and I am trying to write a C++ program that intercepts all touch screen input, however some input is still getting through.
我的代码使用PT_TOUCH调用RegisterPointerInputTarget来拦截触摸输入.这似乎大部分都是可行的，但是结果却不一致.作为测试，我添加了使用SendInput在检测到触摸输入时将鼠标缓慢向右移动的代码.例如，通过运行程序，我可以打开MS Paint并触摸屏幕.只要我保持手指不动，光标就会按预期缓慢地向右移动.但是，当我移动手指的那一刻，光标会捕捉到手指下的位置，就像程序完全没有运行一样.
My code calls RegisterPointerInputTarget with PT_TOUCH to intercept touch input. This mostly seems to work, however the results are inconsistent. As a test I have added code that uses SendInput to move the mouse slowly to the right whenever touch input is detected. With my program running I can, for example, open up MS Paint and touch the screen. So long as I hold my finger still on the cursor moves slowly to the right as expected. The moment I move my finger however, the cursor snaps to the position under my finger, just as it would if my program were not running at all.
再举一个例子，如果我在Visual Studio中尝试相同的操作，则光标再次向右缓慢移动，直到我移动手指，在该点上，光标跟随手指的移动，但缓慢地，滞后于其后面明显的延迟.
To give another example, if I try the same thing in visual studio, again the cursor moves slowly to the right until I move my finger at which point the cursor follows my fingers' movement but slowly, lagging be behind it with a significant delay.
设置我的窗口的代码如下:
The code to set up my window looks like this;
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
hInst = hInstance; // Store instance handle in our global variable
static const char* class_name = "DUMMY_CLASS";
WNDCLASSEX wx = {};
wx.cbSize = sizeof(WNDCLASSEX);
wx.lpfnWndProc = WndProc; // function which will handle messages
wx.hInstance = hInst;
wx.lpszClassName = class_name;
HWND hWnd = 0;
if (RegisterClassEx(&wx)) {
hWnd = CreateWindowEx(0, class_name, "dummy_name", 0, 0, 0, 0, 0, HWND_MESSAGE, NULL, NULL, NULL);
}
if (!hWnd)
{
return FALSE;
}
ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);
if (RegisterTouchWindow(hWnd, 0) &&
RegisterPointerInputTarget(hWnd, PT_TOUCH))
{
...
我的消息处理代码如下:
and my message handling code looks like this;
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_TOUCH:
{
INPUT Inputs[1] = { 0 };
Inputs[0].type = INPUT_MOUSE;
Inputs[0].mi.dx = 1;
Inputs[0].mi.dy = 0;
Inputs[0].mi.dwFlags = MOUSEEVENTF_MOVE;
SendInput(1, Inputs, sizeof(INPUT));
理想情况下，此测试代码将简单地为任何触摸输入移动光标.在修复或仅了解此方面的任何帮助将不胜感激！
Ideally this test code would simply move the cursor for any touch input. Any help in fixing or just understanding this would be greatly appreciated!
推荐答案
我在此方面取得了一些进展，但遇到了其他相关问题，我将在另一个问题中提出.该问题直播时，我将在此处添加评论.但是，解决此初始问题的关键是确保我返回0，而不从所有WM_POINTERENTER，WM_POINTERLEAVE，WM_POINTERUP，WM_POINTERDOWN，WM_POINTERUPDATE和WM_TOUCH消息调用DefWindowProc，并将我的SendInput调用放入处理WM_UPDATE消息的代码中.
I have made some progress with this but have hit other, related, problems I will ask about in a separate question. I will add a comment here when that question is live. The key to sorting out this initial issue however was to make sure I am returning 0, without calling DefWindowProc from all WM_POINTERENTER, WM_POINTERLEAVE, WM_POINTERUP, WM_POINTERDOWN, WM_POINTERUPDATE and WM_TOUCH messages, and to put my SendInput call into the code processing the WM_UPDATE message.
这篇关于RegisterPointerInputTarget不消耗所有输入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！
