程序代码：

#include <windows.h>
#include <stdio.h>
LRESULT CALLBACK WinLogerPro(
  HWND hKeyloger,      // handle to window
  UINT uMsg,      // message identifier
  WPARAM wParam,  // first message parameter
  LPARAM lParam   // second message parameter
);
int WINAPI WinMain(
  HINSTANCE klg,      // handle to current instance
  HINSTANCE hPrevInstance,  // handle to previous instance
  LPSTR lpCmdLine,          // command line
  int nCmdShow              // show state
)
{
    WNDCLASS keyloger;
    keyloger.style=CS_HREDRAW | CS_VREDRAW;
    keyloger.lpfnWndProc=WinLogerPro;
    keyloger.cbClsExtra=0;
    keyloger.cbWndExtra=0;
    keyloger.hInstance=klg;
    keyloger.hIcon=LoadIcon(NULL,IDI_ERROR);
    keyloger.hCursor=LoadCursor(NULL,IDC_CROSS);
    keyloger.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
    keyloger.lpszMenuName=NULL;
    keyloger.lpszClassName="keyloger";
    RegisterClass(&keyloger);

    HWND hKeyloger;
    hKeyloger=CreateWindow("keyloger","键盘记录",WS_OVERLAPPEDWINDOW,0,0,600,400,NULL,NULL,klg,NULL);
    ShowWindow(hKeyloger,SW_SHOWNORMAL);
    UpdateWindow(hKeyloger);

        MSG msg;
    while(GetMessage(&msg,NULL,0,0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return 0;

}
LRESULT CALLBACK WinLogerPro(
  HWND hKeyloger,      // handle to window
  UINT uMsg,      // message identifier
  WPARAM wParam,  // first message parameter
  LPARAM lParam   // second message parameter
)
{
    switch (uMsg)
    {
    case WM_LBUTTONDOWN:
        MessageBox(hKeyloger,"How   do   you   do?","Hello",MB_YESNO);
    }
    return 0;
}