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Recent content by jmantilla

  1. J

    how to send AT commands to modem?

    you can open the serial port (COM1, COM2, ...) as a FILE object and then send commands by writing to the file ...
  2. J

    buck converter eficiency ...

    Wich parameters affect efficiency on buck (simple) converters ... ?
  3. J

    How to use _outp() function

    You can´t write/read directly to/from the ports on W2K or XP, it must be done trough a device driver .... Take a look for dlPortIO library.
  4. J

    Visual Basic and rs-232 port

    BD, just use MS Comm control and keep track on the OnComm event for the control ... Private Sub MSComm_OnComm () Select Case MSComm1.CommEvent ' Handle each event or error by placing ' code below each case statement ' Errors Case comEventBreak ' A Break was received...
  5. J

    C++ - inserting images into files

    The easiest way to acomplish this could be using OLE Automation ... You can use this VB code to figure C++ code using automation Selection.InlineShapes.AddPicture FileName:= _ "D:something.jpg", LinkToFile:=False, SaveWithDocument:=True Selection.TypeParagraph...
  6. J

    how to use dlportio.dll?

    dlportwriteportuchar you have to include dlportio.lib to your project library modules, if you are using MS C++ add this file following this ... Top Menu Project Settings (Alt-F7) -- go to "link" tab -- on the "object/library modules" field append the .lib filename "dlportio.lib"...
  7. J

    Optimal refreshing rate for 7-segment Displays

    every LED should be "refreshed" at least 30 times per second
  8. J

    How to create .dll files using compilers?

    Re: How to create .dll files If you are using Visual C++ you can start from the top menu ... FILE NEW (Choose poject type tag) * for MFC chose : MFC AppWizard (dll) * for non MFC choose : Win32 Dynamic-Link library A dll have a dllMain entry point (for initialization for...
  9. J

    220Vac to 5vCC without transformer

    using capacitors to reduce 220vac you should preserve electrical isolation between the high voltage source and your circuit using a transformer, it can be really small by using an offline switching regulator... take a look at the following AN from Intusoft...
  10. J

    Interfacing an IDE hard drive

    for hw interfacing take a look at this page ... https://www.pjrc.com/tech/8051/ide/ it shows how to interface an IDE drive using microcontrollers.
  11. J

    Need program in C++ that will ignore the Alt+F4 function

    Re: Ignoring Alt+f4 .... within you WndProc function ... include a handler for WM_CLOSE message ... LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) { int wmId, wmEvent; PAINTSTRUCT ps; HDC hdc; TCHAR szHello[MAX_LOADSTRING]; LoadString(hInst, IDS_HELLO...
  12. J

    Need program in C++ that will ignore the Alt+F4 function

    Re: Ignoring Alt+f4 You may not remove the Control-Box exit command to preserve windows interface. If you are using MFC, override the OnClose function for the main window, the default implementation calls DestroyWindow ... you can make any closeout procedures before calling Destroy.... If you...
  13. J

    How to send big files with Hyperterminal using Zmodem?

    Re: need Hyperterminal help ... use "ZModem with crash recovery", if you drop the line, once you restart the trasmission, it begins where it was left ...
  14. J

    How to be a good project lead?

    You can reach several instructive documents on www.pmi.org. Also take a look at Steve McConnell books, mainly intended for sw development groups, but principles are general to project management. I will post on Book forum the PMI guide, it is very helpfull on project management discipline.
  15. J

    Does Visual Basic 6 support Thread Programming?

    Re: Thread Programming You can have multiple threads on VB6 by using ActiveX servers, if you want to have multiple thread I recommed C++ instead of VB, since you can manage concurrency, control object access, ... Hyperthreading is not quite the same as multi-threading, on the first, your P4...

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