can't send WM_KEYDOWN correctly?

Hi,everyone!

I'm tring to write a program to send key press message to other program(such as notepad).I mean if I press "M" in my program,this "M" will append to the notepad text entry.

here is my code:
hwnd = FindWindow(NULL,"Untitled - Notepad");
if(hwnd!=0){
char buffer[100] = "";
GetWindowText(hwnd,buffer,50);
MoveWindow(hwnd,0,0,500,500,TRUE);
SendMessage(hwnd,WM_KEYDOWN,VK_NUMPAD0,0);
SendMessage(hwnd,WM_KEYUP,VK_NUMPAD0,0);
printf("%d\n%s\n",hwnd,buffer);

}else{
printf("%d\n",hwnd);
printf("failure\n");
}


After running this program,the MoveWidnow() function worked,but there isn't any character in notepad text entry...
What should I do to solve this problem?
Any suggestion is appreciated!

Use SendInput API instead.

Consider keybd_event() function, it emulates keyboard events, but it will work only if your window is focused.

Use WM_SETTEXT message to add text into that window, it has not to be focused.

Quote:

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Originally Posted by davidk

Consider keybd_event() function, it emulates keyboard events, but it will work only if your window is focused.

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keybd_event is obsolete and should not be used in Win32 applications. SendInput API should be used instead.

thanks for your reply,but when I'm compiling the program,following error occurs:

KEYBDINPUT undefined

Have a look at this thread

sorry for my no reply.

now I can use SendInput(),but after I invoked the sendinput(),there isn't anything happend in notepad

this is my code:
KEYBDINPUT kb={0};
kb.wVk = 0x46;
kb.wScan = 0;
kb.dwFlags = KEYEVENTF_UNICODE; // KEYEVENTF_UNICODE=4


INPUT input = {0};
input.type = INPUT_KEYBOARD;
input.ki = kb;


SendInput(1,&input,sizeof(input));

Quote:

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Originally Posted by linkstack

sorry for my no reply.

now I can use SendInput(),but after I invoked the sendinput(),there isn't anything happend in notepad

this is my code:

Code:

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KEYBDINPUT kb={0};
        kb.wVk    =  0x46;
    kb.wScan = 0;
    kb.dwFlags = KEYEVENTF_UNICODE; // KEYEVENTF_UNICODE=4


        INPUT input = {0};
        input.type = INPUT_KEYBOARD;
    input.ki = kb;


        SendInput(1,&input,sizeof(input));

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From MSDN:

Quote:

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KEYEVENTF_UNICODE Windows 2000:

If specified, the system synthesizes a VK_PACKET keystroke. The wVk parameter must be zero. This flag can only be combined with the KEYEVENTF_KEYUP flag. For more information, see the Remarks section.

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