C / C++ / MFC

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How to send a keystroke or a mouse event to another running process in Ubuntu? I want to write a C program that reads data from the USB port sent by AVR Micro Controller board continuously.In response to that it checks the data received and sends a command to another process running on the computer? Example,when the program reads 101 from the USB port it sends left mouse button down to the VLC media player window that is currently running? Can anybody explain the whole process in detail?? I would be very thankful...

 
HKEY hKey = HKEY_CURRENT_USER;
 
TCHAR filePath[MAX_PATH];
TCHAR dirPath[MAX_PATH];
 
GetCurrentDirectory(MAX_PATH, dirPath);
 
StringTruncate(filePath, dirPath, "\\Default.wav");
 
//For ex: filePath may equal C:\abc\123\Default.wav, if my folder path
//is C:\abc\123.

WriteReg(hKey, _T("SOFTWARE\\Microsoft\\Windows\\CurrentVersion"), _T("Sound"), filePath);
 

void Writer::DoWrite(QString auditEntry){
    QByteArray ba = auditEntry.toLatin1();
    char* aestr = ba.data();
    std::string aestdstr(aestr);
 
    log4cxx::LoggerPtr logger = log4cxx::Logger::getLogger("RMAT");
    LOG4CXX_INFO(logger, aestdstr);//Buffer overrun happens somewhere in this method call
}

Quote:

A buffer overrun has occurred in app.exe which has corrupted the program's internal state. Press Break to debug the program or Continue to terminate the program.
 
For more details please see Help topic 'How to debug Buffer Overrun Issues'.