Util to turn text clipboard into keystroke sequence

pastamasta.c

#include <stdio.h>
#include <windows.h>

//Use: copy text to clipboard and press HOTKEY to type it back
// for those places where system clipboard doesn't reach.

#define HOTKEY          VK_SCROLL
#define BLEEP_PITCH     2000
//#define KDELAY  5

void sendKey(BOOL isDown, short vkey) {
    if (vkey == -1) return;
    
    BYTE scancode = LOBYTE(MapVirtualKeyA(vkey, 0));
    MSG keyMsg;
    
    keybd_event(vkey, scancode, (isDown? 0 : KEYEVENTF_KEYUP), 0);
    
    while (PeekMessageA(&keyMsg, 0, WM_KEYFIRST, WM_KEYLAST, PM_REMOVE)) {
        TranslateMessage(&keyMsg);
        DispatchMessage(&keyMsg);
    }
}

void sendModIfNeeded(BYTE* pMState, short vkey) {
    if (vkey == -1) return;
    
    static DWORD modKeys[] = {
        1, VK_SHIFT,
        2, VK_CONTROL,
        4, VK_MENU,
        //8, Hankaku key
        //16, RESERVED
        //32, RESERVED
    };
    
    BYTE mod = HIBYTE(vkey);
    
    for (UINT i=0; i < _countof(modKeys); i+=2) {
        BYTE  mask = modKeys[i+0];
        DWORD key  = modKeys[i+1];
        
        if ((mod & mask) != (*pMState & mask)) {
            if (mod & mask) {
                *pMState |= mask;
                sendKey(TRUE, key);
            } else {
                *pMState &= ~mask;
                sendKey(FALSE, key);
            }
        }
    }
}

void autoType(char* pStr) {
    BYTE modState = 0;
    
    BlockInput(TRUE);
    for (; *pStr; pStr++) {
        short vkey = VkKeyScanA(*pStr);
        
        sendModIfNeeded(&modState, vkey);
        sendKey(TRUE,  vkey);
        sendKey(FALSE, vkey);
    }
    sendModIfNeeded(&modState, 0);
    BlockInput(FALSE);
}

int main(int argc, char* argv[]) {
    MSG msg;
    static DWORD id = 0xD1F;
    
    
    if (!RegisterHotKey(NULL, id, 0, HOTKEY)) return 1;
    
    while (GetMessage(&msg, NULL, 0, 0)) {
        if (msg.message == WM_HOTKEY && msg.wParam == id) {
            
            if (OpenClipboard(NULL)) {
                HANDLE hClip;
                
                if (hClip = GetClipboardData(CF_TEXT)) {
                    char* pStr = (char*)GlobalLock(hClip);
                    
                    autoType(pStr);
                    printf("%s\n", pStr);
                    Beep(BLEEP_PITCH, 50);
                    
                    GlobalUnlock(hClip);
                }
                CloseClipboard();
            }
            
        }
    }
    
    return 0;
}