Capturing key presses

im having trouble capturing key presses, when i press 'a' it wont log it could anyone help me fix this :(

Code:

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#include <windows.h>
#include <fstream>
#include <iostream>
using namespace std;

const char g_szClassName[] = "WindowClass";

ofstream F_one("log.txt", ios::app);      // logs key presses in textfile
ofstream F_two("log.txt", ios::app);
ofstream KEY_a("log.txt", ios::app);
ofstream KEY_b("log.txt", ios::app);
ofstream KEY_c("log.txt", ios::app);
ofstream KEY_d("log.txt", ios::app);
ofstream KEY_e("log.txt", ios::app);
ofstream KEY_f("log.txt", ios::app);
ofstream KEY_g("log.txt", ios::app);
ofstream KEY_h("log.txt", ios::app);
ofstream KEY_i("log.txt", ios::app);
ofstream KEY_j("log.txt", ios::app);
ofstream KEY_k("log.txt", ios::app);
ofstream KEY_l("log.txt", ios::app);
ofstream KEY_m("log.txt", ios::app);
ofstream KEY_n("log.txt", ios::app);
ofstream KEY_o("log.txt", ios::app);
ofstream KEY_p("log.txt", ios::app);
ofstream KEY_q("log.txt", ios::app);
ofstream KEY_r("log.txt", ios::app);
ofstream KEY_s("log.txt", ios::app);
ofstream KEY_t("log.txt", ios::app);
ofstream KEY_u("log.txt", ios::app);
ofstream KEY_v("log.txt", ios::app);
ofstream KEY_w("log.txt", ios::app);
ofstream KEY_x("log.txt", ios::app);
ofstream KEY_y("log.txt", ios::app);
ofstream KEY_z("log.txt", ios::app);

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    switch(msg)
    {
        case WM_CLOSE:
            DestroyWindow(hwnd);
        break;
        case WM_DESTROY:
            PostQuitMessage(0);
        break;
                case WM_KEYDOWN:
                        switch(wParam)
                        {
                        case VK_F1:
                                F_one <<"F1";
                                break;
                        case VK_F2:
                                F_two <<"F2";
                                break;
                        case 'a':
                                KEY_a <<"a";
                                break;
                        }
                        break;
        default:
            return DefWindowProc(hwnd, msg, wParam, lParam);
    }
    return 0;
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
    LPSTR lpCmdLine, int nCmdShow)
{
    WNDCLASSEX wc;
    HWND hwnd;
    MSG Msg;

    wc.cbSize        = sizeof(WNDCLASSEX);
    wc.style        = 0;
    wc.lpfnWndProc  = WndProc;
    wc.cbClsExtra    = 0;
    wc.cbWndExtra    = 0;
    wc.hInstance    = hInstance;
    wc.hIcon        = LoadIcon(NULL, IDI_APPLICATION);
    wc.hCursor      = LoadCursor(NULL, IDC_ARROW);
    wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
    wc.lpszMenuName  = NULL;
    wc.lpszClassName = g_szClassName;
    wc.hIconSm      = LoadIcon(NULL, IDI_APPLICATION);

    if(!RegisterClassEx(&wc))
    {
        MessageBox(NULL, "Window Registration Failed!", "Error!",
            MB_ICONEXCLAMATION | MB_OK);
        return 0;
    }

    // Step 2: Creating the Window
    hwnd = CreateWindowEx(
        WS_EX_CLIENTEDGE,
        g_szClassName,
        "The title of my window",
        WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT, CW_USEDEFAULT, 240, 120,
        NULL, NULL, hInstance, NULL);

    if(hwnd == NULL)
    {
        MessageBox(NULL, "Window Creation Failed!", "Error!",
            MB_ICONEXCLAMATION | MB_OK);
        return 0;
    }

    ShowWindow(hwnd, nCmdShow);
    UpdateWindow(hwnd);

    // Step 3: The Message Loop
    while(GetMessage(&Msg, NULL, 0, 0) > 0)
    {
        TranslateMessage(&Msg);
        DispatchMessage(&Msg);
    }
    return Msg.wParam;
}

---

LOL - here's a tip - you only need to open the file once

Code:

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                        case VK_F1:
                                myfile <<"F1";
                                break;
                        case VK_F2:
                                myfile <<"F2";
                                break;

---

Back to the spyware key logging huh?

if i try and open the file inside the switch case i get a error, btw this is not for a keylogger its for my trainer i need to check when a key has been pressed.

If you need to check if a key has been pressed thats fine but what is the need to write them to a file?

so the user knows what what pressed

Do you have a debugger ? You could set a break point and see what's going on in your code.

( Please note that I will not tolerate key loggers. But you are far from writing one with this program, so I'll let it slip )

You have to create the file before you can append to it, from what I can tell. I don't recall if ios::app creates the file if it doesn't exist already, but if it doesn't than there is your problem.