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numlock.c
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numlock.c
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#include <windows.h>
#include <string.h>
#include<ctype.h>
void SetKey(BOOL bState, unsigned int keyCode) {
BYTE keyState[256];
INPUT input[2];
GetKeyboardState((LPBYTE) & keyState);
if ((bState && !(keyState[keyCode] & 1)) ||
(!bState && (keyState[keyCode] & 1))) {
ZeroMemory(input, sizeof(input));
input[0].type = input[1].type = INPUT_KEYBOARD;
input[0].ki.wVk = input[1].ki.wVk = keyCode;
input[1].ki.dwFlags = KEYEVENTF_KEYUP;
// Simulate a key input
SendInput(2, input, sizeof(INPUT));
}
}
//main entry
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd) {
BOOL bState;
if (lstrlen(lpCmdLine) > 0) {
bState = FALSE;
} else {
bState = TRUE;
}
//get self path
char selfName[MAX_PATH];
GetModuleFileName(NULL, selfName, MAX_PATH);
//get file name from path
const char * ptr = strrchr(selfName, '\\');
if (ptr != NULL)
strcpy(selfName, ptr + 1);
//convert file name to lower case
for (unsigned int i = 0; i < lstrlen(selfName); i++)
selfName[i] = tolower(selfName[i]);
//MessageBox(NULL, selfName, NULL, MB_OK|MB_ICONINFORMATION);
if (strstr(selfName, "off") || strstr(selfName, "un"))
bState = !bState;
if (strstr(selfName, "num"))
SetKey(bState, VK_NUMLOCK);
if (strstr(selfName, "caps") || strstr(selfName, "capital"))
SetKey(bState, VK_CAPITAL);
if (strstr(selfName, "scro") || strstr(selfName, "scrl"))
SetKey(bState, VK_SCROLL);
return 0;
}