"Switch-App" simulation using Touch Injection API in Windows 8 - C++ code - touch

Question

A simple way to switch between application in Windows 8 is "Swipe Right" using the touch screen (put down one finger in the left side of the screen and move it a few pixels to the right). I'm trying to simulate this behavior using Touch Injection API but the switch app behavior is not invoked although the feedback shows the swipe is actually happening.
Here's the code I ran:
int main()
{
//Screen Resolution 1366x768
BOOL ret = TRUE;
//init
InitializeTouchInjection(10, TOUCH_FEEDBACK_INDIRECT);
POINTER_TOUCH_INFO contact = {0};
memset(&contact, 0, sizeof(POINTER_TOUCH_INFO));
contact.pointerInfo.pointerType = PT_TOUCH;
contact.pointerInfo.pointerId = 0;
//set start point (a point at the left side of the screen)
contact.pointerInfo.ptPixelLocation.y = 768/2;
contact.pointerInfo.ptPixelLocation.x = 0;
contact.touchFlags = TOUCH_FLAG_NONE;
contact.touchMask = TOUCH_MASK_CONTACTAREA | TOUCH_MASK_ORIENTATION | TOUCH_MASK_PRESSURE;
contact.orientation = 90;
contact.pressure = 32000;
contact.rcContact.top = contact.pointerInfo.ptPixelLocation.y -2;
contact.rcContact.bottom = contact.pointerInfo.ptPixelLocation.y + 2;
contact.rcContact.left = contact.pointerInfo.ptPixelLocation.x -2;
contact.rcContact.right = contact.pointerInfo.ptPixelLocation.x + 2;
//set flags for "start touch"
contact.pointerInfo.pointerFlags = POINTER_FLAG_DOWN | POINTER_FLAG_INRANGE | POINTER_FLAG_INCONTACT;
ret = InjectTouchInput(1, &contact);
cout << "X: " << contact.pointerInfo.ptPixelLocation.x << " Y: " << contact.pointerInfo.ptPixelLocation.y << endl;
if(ret != TRUE)
{
cout << "Error 1: " << GetLastError() <<endl;
return 1;
}
for(int i=0; i<100; i++)
{
//set flags for "update"
contact.pointerInfo.pointerFlags = POINTER_FLAG_UPDATE | POINTER_FLAG_INRANGE | POINTER_FLAG_INCONTACT;
//move the location one pixel right
contact.rcContact.bottom = contact.pointerInfo.ptPixelLocation.x++;
ret = InjectTouchInput(1, &contact);
cout << "X: " << contact.pointerInfo.ptPixelLocation.x << " Y: " << contact.pointerInfo.ptPixelLocation.y << endl;
if(ret != TRUE)
{
cout << "Error 2: " << GetLastError() <<endl;
return 1;
}
}
//set flags for "end touch"
contact.pointerInfo.pointerFlags = POINTER_FLAG_UP;
ret = InjectTouchInput(1, &contact);
cout << "X: " << contact.pointerInfo.ptPixelLocation.x << " Y: " << contact.pointerInfo.ptPixelLocation.y << endl;
if(ret != TRUE)
{
cout << "Error 3: " << GetLastError() <<endl;
return 1;
}
return 0;
}
Is there any idea why this code doesn't behave as expected?
By the way, same happens when trying to "Swipe Left" to open Charms-Bar
The code is written relating on this article