Sometimes, we need to send keys to another process when developing MFC application.
We called sending keys "Key simulation"
For this purpose, we can use the function "SendInput" as a function of MFC.
Here I will describe an example. So, see the function description.
We have to get a window handle to send keys.
In MFC, there are several methods for this. Here I will use FindWindowEx method.
When finding the specific window handle, you can describe "class name" or "Window title name"
I think "Window title name" is more convenient.
// Get window handle
HWND hWindow = ::FindWindowEx(NULL, NULL, "Class Name", 0);
or
HWND hWindow = ::FindWindowEx(NULL, NULL, 0, "Window title name");
// Get thread and process id
PROCESS_INFORMATION pi;
pi.dwThreadId = ::GetWindowThreadProcessId(hWindow, &(pi.dwThreadId));
SendKey(WORD('A'), MapVirtualKey('A',0), pi);
Refer two methods 'SendKey' and 'SendCtrlShiftKey'
void SendKey(WORD vk, WORD scan, PROCESS_INFORMATION pi)
{
INPUT is;
is.type = INPUT_KEYBOARD; //INPUT_KEYBOARD = 1
is.ki.time = 0;
is.ki.wVk = vk;
is.ki.wScan = scan;
is.ki.dwFlags = NULL;
is.ki.dwExtraInfo = NULL;
SendInput(1, &is, sizeof(INPUT)); // Key down
WaitForInputIdle( pi.hProcess, INFINITE );
is.ki.wVk = vk;
is.ki.dwFlags = KEYEVENTF_KEYUP;
is.ki.wScan = scan;
is.type = INPUT_KEYBOARD;
SendInput(1, &is, sizeof(INPUT)); // Key up
WaitForInputIdle( pi.hProcess, INFINITE );
}
void SendCtrlShiftKey(WORD vk, PROCESS_INFORMATION pi)
{
INPUT inp[6];
short Ecnt = 0x00;
// VK_CONTROL down.
inp[0].ki.time = NULL;
inp[0].type = INPUT_KEYBOARD;
inp[0].ki.dwExtraInfo = NULL;
inp[0].ki.dwFlags = NULL;
inp[0].ki.wVk = VK_CONTROL;
inp[0].ki.wScan = MapVirtualKey(VK_CONTROL,0);
// VK_SHIFT down.
inp[1].ki.time = NULL;
inp[1].type = INPUT_KEYBOARD;
inp[1].ki.dwExtraInfo = NULL;
inp[1].ki.dwFlags = NULL;
inp[1].ki.wVk = VK_SHIFT;
inp[1].ki.wScan = MapVirtualKey(VK_SHIFT,0);
// Character Key down.
inp[2].ki.time = NULL;
inp[2].type = INPUT_KEYBOARD;
inp[2].ki.dwExtraInfo = NULL;
inp[2].ki.dwFlags = NULL;
inp[2].ki.wVk = vk;
inp[2].ki.wScan = MapVirtualKey(vk,0);
// VK_CONTROL up.
inp[3].ki.time = NULL;
inp[3].type = INPUT_KEYBOARD;
inp[3].ki.dwExtraInfo = NULL;
inp[3].ki.dwFlags = KEYEVENTF_KEYUP;
inp[3].ki.wVk = VK_CONTROL;
inp[3].ki.wScan = MapVirtualKey(VK_CONTROL,0);
// VK_SHIFT up.
inp[4].ki.time = NULL;
inp[4].type = INPUT_KEYBOARD;
inp[4].ki.dwExtraInfo = NULL;
inp[4].ki.dwFlags = KEYEVENTF_KEYUP;
inp[4].ki.wVk = VK_SHIFT;
inp[4].ki.wScan = MapVirtualKey(VK_SHIFT,0);
// Character Key up.
inp[5].ki.time = NULL;
inp[5].type = INPUT_KEYBOARD;
inp[5].ki.dwExtraInfo = NULL;
inp[5].ki.dwFlags = KEYEVENTF_KEYUP;
inp[5].ki.wVk = vk;
inp[5].ki.wScan = MapVirtualKey(vk,0);
SendInput(1,inp,sizeof(INPUT)); // VK_CONTROL down
WaitForInputIdle( pi.hProcess, INFINITE );
SendInput(1,&inp[1],sizeof(INPUT)); // VK_SHIFT down
WaitForInputIdle( pi.hProcess, INFINITE );
SendInput(1,&inp[2],sizeof(INPUT)); // Key down
WaitForInputIdle( pi.hProcess, INFINITE );
SendInput(1,&inp[5],sizeof(INPUT)); // Key up
WaitForInputIdle( pi.hProcess, INFINITE );
SendInput(1,&inp[4],sizeof(INPUT)); // VK_SHIFT up
WaitForInputIdle( pi.hProcess, INFINITE );
SendInput(1,&inp[3],sizeof(INPUT)); // VK_SHIFT up
WaitForInputIdle( pi.hProcess, INFINITE );
}
