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Keyboard key ... does not receive lower or upper case characters

The function below writes "0", "z" and "1" ok ... but does not capture "Z" (shift-z) ... any help would be appreciated ...

__declspec(dllexport)
LRESULT CALLBACK HookProc (UINT nCode, WPARAM wParam, LPARAM lParam)
{
    if ((nCode == HC_ACTION) && (wParam == WM_KEYUP))
    {
        // This Struct gets infos on typed key
        KBDLLHOOKSTRUCT hookstruct = *((KBDLLHOOKSTRUCT*)lParam);

        // Bytes written counter for WriteFile()
        DWORD Counter;

        wchar_t Logger[1];

        switch (hookstruct.vkCode)
        {
        case 060: Logger[0] = L'0'; break;
        case 061: Logger[0] = L'1'; break;
        case 90: Logger[0] = L'z'; break;
        case 116: Logger[0] = L'Z'; break;
        }

        // Opening of a logfile. Creating it if it does not exists
        HANDLE  hFile = CreateFile(L"C:\\logfile.txt", GENERIC_WRITE,
            FILE_SHARE_READ, NULL,OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);

        // put the file pointer to the end
        SetFilePointer(hFile,NULL,NULL,FILE_END);

        // Write the hFile typed in logfile
        WriteFile(hFile,&Logger,sizeof(Logger),&Counter,NULL);

        //WriteFile(hFile,&hookstruct.vkCode,sizeof(hookstruct.vkCode),&Counter,NULL);
        // Close the file
        CloseHandle(hFile);
    }
}
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2 answers


The keyboard is not sending characters. He sends the keys. If you enter z or Z, you are still pressing the same key and that key has the same VK code both times.

You should also receive a notification when you press or release the Shift key. You can use these notifications to translate keystrokes to characters. The blocking state will also be important for this. You may also be worried about dead keys.



You can check if the Shift key is pressed. GetAsyncKeyState

will tell you about the state of the key right now, and GetKeyState

will tell you the state of the key from the last message removed from the message queue.

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No virtual key code for Z. Try something like this:



            case 90:
                 if(GetKeyState(VK_LSHIFT|VK_RSHIFT)
                     Logger[0] = L'Z'; break;
                 else
                     Logger[0] = L'z'; break;
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