Is there a way to provide fake I/O information to a separate program?-CodePudding

For example, I want to simulate a mouse click at a specific position in a window, but I don't want my real cursor to move or do anything. Is there a possible solution ?

CodePudding user response：

I wrote a mouse operation sample of SendInput, hoping to help you. For more mouse operations, please refer to the definition here

#include <windows.h>
#include <iostream>

void mouseEvent(int x, int y,DWORD dwFlags) {
    
    MOUSEINPUT mi = { 0 };//Create a mouse structure variable
    mi.dwFlags = dwFlags;
    
    //Set the flags to move and absolute position.
    //The absolute position means that the mouse will be set with the upper left corner as 0, 0, and dx, dy as the coordinate values (the range is 0~65535). If there is no such flag, it is the relative position of moving dx and dy from the last mouse position as the starting point.
    //Next, we need to correspond dx and dy to screen coordinates. The MOUSEEVENTF_VIRTUALDESK flag seems to do the job, but it doesn't work as expected, so I don't know how to use this parameter.
    //Then we can complete the normalization task by ourselves, that is, normalize the coordinates of (0~65535) to the value range of (0~screen width, 0~screen height).
    //First get the screen width and height
    int cx_screen = ::GetSystemMetrics(SM_CXSCREEN);
    int cy_screen = ::GetSystemMetrics(SM_CYSCREEN);

    //Perform normalization processing and use float type to ensure accuracy
    float per_x = 65535.0f / cx_screen;
    float per_y = 65535.0f / cy_screen;

    //Rounding with the ceilf function
    mi.dx = (long)ceilf(x * per_x);
    mi.dy = (long)ceilf(y * per_y);

    //Set this structure to the SendInput function
    INPUT input{};
    input.type = INPUT_MOUSE;
    input.mi = mi;
    SendInput(1, &input, sizeof(INPUT));
}

int main()
{
    //std::cout << "Hello World!\n";
    mouseEvent(10, 10, MOUSEEVENTF_MOVE      | MOUSEEVENTF_ABSOLUTE);
    mouseEvent(10, 10, MOUSEEVENTF_RIGHTDOWN | MOUSEEVENTF_ABSOLUTE);
    mouseEvent(10, 10, MOUSEEVENTF_RIGHTUP   | MOUSEEVENTF_ABSOLUTE);
}

CodePudding user response：

If you want to send inputs to the active window you can do it by following this article.

It uses InputSimulator to send inputs to active windows. It is available as a Nuget package too.

Edit: If you want to send mouse events without moving your own cursor, what you could try is running your target program and the C# automation program inside a virtual machine, that way you can have 2 mouse cursors (one in your main OS, and the other in the automated OS)