C++ 检测鼠标按钮是否按下
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Detect if mouse button is down
提问by Jordan B
I am new to c++ and I am trying to activate a line of code onlywhen the left mouse button is held down. In this example, my code works but it seems that it just toggles it. When I click, it spams the Hkey then, when I click again, it stops.
我是 C++ 新手，我试图仅在按住鼠标左键时激活一行代码。在这个例子中，我的代码有效，但它似乎只是切换它。当我单击时，它会发送H密钥，然后当我再次单击时，它会停止。
Currently I have this code:
目前我有这个代码：
if ((GetKeyState(VK_LBUTTON)))
{
keybd_event(VkKeyScan('H'),0,0,0);
Sleep ( 30 );
}
Edit:
编辑：
I have inside the function:
我在函数里面有：
int WINAPI WinMain ( HINSTANCE hInst, HINSTANCE P, LPSTR CMD, int nShowCmd );
回答by pippin1289
Use this to determine if the button is pressed.
使用它来确定按钮是否被按下。
if((GetKeyState(VK_LBUTTON) & 0x100) != 0)
回答by alk
The application can catch messages and process being sent to your window indicating a state change of any mouse button.
该应用程序可以捕获发送到您的窗口的消息和进程，以指示任何鼠标按钮的状态更改。
When the left button is pressed a
当按下左键时
WM_LBUTTONDOWN
is sent.
已发送。
When it is released
当它被释放
WM_LBUTTONUP
is sent.
已发送。
Please read here for various messages being sent to indicate mouse events.
回答by Lyusten Elder
In first - need DEFINE BUTTON ID(or another object ID) in begin code:
首先 - 需要在开始代码中定义按钮 ID（或另一个对象 ID）：
#define ID_BUTTON1 105
Then AFTER creationale of hWnd - we make button:
然后在创建 hWnd 之后 - 我们制作按钮：
HWND HwndButton1 = CreateWindow(
L"BUTTON", // Predefined class; Unicode assumed
L"OK", // Button text
WS_TABSTOP | WS_VISIBLE | WS_CHILD | BS_DEFPUSHBUTTON, // Styles
10, // x position
10, // y position
100, // Button width
100, // Button height
hWnd, // Parent window
(HMENU) ID_BUTTON1, // ID кнопки в меню
NULL, // Сущность мне неведомая 8-)
NULL); // Pointer not needed.
And then add trigger in function:
然后在函数中添加触发器：
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
int wmId=0, wmEvent; //wmId NEED DEFINE null - if he is not available in event, else be ашипка
PAINTSTRUCT ps;
HDC hdc;
switch (message)
{
case WM_COMMAND:
wmEvent = HIWORD(wParam); // Name of EVENT - имя события
wmId = LOWORD(wParam); // ID element for event - элемент с которым оно случилось
case WM_LBUTTONDOWN: MessageBox(NULL, L"MouseL_Click", L"WndHeader", MB_OK | MB_ICONEXCLAMATION); // Left Mouse Button pressed
if( LOWORD(wParam) == 105 && WM_COMMAND == WM_LBUTTONDOWN){ // Клик по ID_BUTTON1 левым мышком
EndDialog(hWnd,0);
}
................ // Many another function
}
