robotgo/window/win_sys.h

// #include "../base/os.h"

Bounds get_bounds(uintptr pid, uintptr isHwnd){
	// Check if the window is valid
	Bounds bounds;
	if (!IsValid()) { return bounds; }

    #if defined(IS_MACOSX)

        // Bounds bounds;
        AXValueRef axp = NULL;
        AXValueRef axs = NULL;
        AXUIElementRef AxID = AXUIElementCreateApplication(pid);

        // Determine the current point of the window
        if (AXUIElementCopyAttributeValue(AxID, 
            kAXPositionAttribute, (CFTypeRef*) &axp)
            != kAXErrorSuccess || axp == NULL){
            goto exit;
        }

        // Determine the current size of the window
        if (AXUIElementCopyAttributeValue(AxID, 
            kAXSizeAttribute, (CFTypeRef*) &axs)
            != kAXErrorSuccess || axs == NULL){
            goto exit;
        }

        CGPoint p; CGSize s;
        // Attempt to convert both values into atomic types
        if (AXValueGetValue(axp, kAXValueCGPointType, &p) &&
            AXValueGetValue(axs, kAXValueCGSizeType,  &s)){
            bounds.X = p.x;
            bounds.Y = p.y;
            bounds.W = s.width;
            bounds.H = s.height;
        }
        
    exit:
        if (axp != NULL) { CFRelease(axp); }
        if (axs != NULL) { CFRelease(axs); }

        return bounds;

    #elif defined(USE_X11)

        // Ignore X errors
        XDismissErrors();
        MData win;
        win.XWin = (Window)pid;

        Bounds client = GetClient();
        Bounds frame = GetFrame(win);

        bounds.X = client.X - frame.X;
        bounds.Y = client.Y - frame.Y;
        bounds.W = client.W + frame.W;
        bounds.H = client.H + frame.H;

        return bounds;

    #elif defined(IS_WINDOWS)
        HWND hwnd;
        if (isHwnd == 0) {
            hwnd= GetHwndByPId(pid);
        } else {
            hwnd = (HWND)pid;
        }

        RECT rect = { 0 };
        GetWindowRect(hwnd, &rect);

        bounds.X = rect.left;
        bounds.Y = rect.top;
        bounds.W = rect.right - rect.left;
        bounds.H = rect.bottom - rect.top;

        return bounds;

    #endif
}

Bounds get_client(uintptr pid, uintptr isHwnd){
	// Check if the window is valid
	Bounds bounds;
	if (!IsValid()) { return bounds; }

	#if defined(IS_MACOSX)

		return GetBounds(pid, isHwnd);

	#elif defined(USE_X11)

		// Ignore X errors
		XDismissErrors();
		MData win;
        win.XWin = (Window)pid;

		// Property variables
		MData root, parent;
		MData* children;
		unsigned int count;
		int32 x = 0, y = 0;

		// Check if the window is the root
		XQueryTree(rDisplay, win,
			&root, &parent, &children, &count);
		if (children) { XFree(children); }

		// Retrieve window attributes
		XWindowAttributes attr = { 0 };
		XGetWindowAttributes(rDisplay, win, &attr);

		// Coordinates must be translated
		if (parent != attr.root){
			XTranslateCoordinates(rDisplay, win, attr.root, attr.x,
			 attr.y, &x, &y, &parent);
		}
		// Coordinates can be left alone
		else {
			x = attr.x;
			y = attr.y;
		}

		// Return resulting window bounds
		bounds.X = x;
		bounds.Y = y;
		bounds.W = attr.width;
		bounds.H = attr.height;
		return bounds;

	#elif defined(IS_WINDOWS)
		HWND hwnd;
		if (isHwnd == 0) {
			hwnd= GetHwndByPId(pid);
		} else {
			hwnd = (HWND)pid;
		}


		RECT rect = { 0 };
		GetClientRect(hwnd, &rect);

		POINT point;
		point.x = rect.left;
		point.y = rect.top;

		// Convert the client point to screen
		ClientToScreen(hwnd, &point);

		bounds.X = point.x;
		bounds.Y = point.y;
		bounds.W = rect.right - rect.left;
		bounds.H = rect.bottom - rect.top;

		return bounds;

	#endif
}