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You need to ask on a Windows related news group. I'm using Windows XP Professional and I connect to fpga through USB/RS-232 (windows assinged COM12). Even on linux you're supposed to get the state, modify it and set it again. Once OS settings are retrieved, I neeed to update my project dialog with the OS COM Port Settings.

I get the same error displayed on screen when I try and open the serial port. 3) If I open a serial port that is already opened by some Windows software, I usethe example code from MSDN "configuring a communications resource".CreateFile pass through, however GetCommState return 0.WithGetLastError(), i get the error number 87, which means"ERROR_INVALID_PARAMETER The parameter is incorrect. "I'm sure the Dec 27, 2012 at 1:24pm UTC tnjgraham (87) Guestgulkan, By any chance were you able to retrieve/set current system COM Port settings? Thanks for the comments on the PR.

reconbot closed this May 25, 2016 reconbot added this to the 4.0 milestone May 25, 2016 RogerHardiman commented May 25, 2016 Hi Thanks for applying the PR so quickly and getting O.K. Advanced Search Forum Visual C++ & C++ Programming C++ (Non Visual C++ Issues) GetCommState failed with error 87 If this is your first visit, be sure to check out the FAQ We appreciate your feedback.

Here is my code: using namespace std; // For memset. Downloads and tools Windows 10 dev tools Visual Studio Windows SDK Windows Store badges Essentials API reference (Windows apps) API reference (desktop apps) Code samples How-to guides (Windows apps) Learning resources If you choose to participate, the online survey will be presented to you when you leave the Msdn Web site.Would you like to participate? Radius of Convergence of Infinite Series Filter columns basing on the value of other column How exactly does the typical shell "fork bomb" calls itself twice?

Once user has changed settings for a port, the OS COM Port current settings needs to be updated to what user input. To get extended error information, call GetLastError. The DCB structure is then modified and used to reconfigure the device. Configuring a Communications Resource The following example opens a handle to COM2 and fills in a DCB structure with the current configuration.

Examples For an example, see Configuring a Communications Resource. CreateFile pass through, however GetCommState return 0.With GetLastError(), i get the error number 87, which means "ERROR_INVALID_PARAMETER The parameter is incorrect. " I'm sure the serial port works, because i can fSuccess = GetCommState(hCom, &dcb); if (!fSuccess) { // Handle the error. When casting a cube spell on a hex grid do you pick a honeycomb for origin or an intersection for origin?

But this function call fails with an error codeERROR_INVALID_FUNCTION.I have a printer driver whose port is COM1, but no print job is giventhrough that driver, when i excute my program.Can anyone How should I calculate the determinant? I use the example code from MSDN "configuring a communications resource". printf ("CreateFile failed with error %d.\n", GetLastError()); return (1); } // Initialize the DCB structure.

share|improve this answer answered May 21 '11 at 20:54 Sean 6,33032335 Sean, what you said about the parameters of dcb is somewhat correct. Any help will be greatly apprecitated!!!!!!!!!!!! Thanks anyway. The time now is 10:58 PM.

I tried GetCommState which would be perfect. Use SetCommState function to set com port parameters. Return value If the function succeeds, the return value is nonzero. CreateFile pass through, however GetCommState return 0.With GetLastError(), i get the error number 87, which means "ERROR_INVALID_PARAMETER The parameter is incorrect. " I'm sure the serial port works, because i can

Mein KontoSucheMapsYouTubePlayNewsGmailDriveKalenderGoogle+ÜbersetzerFotosMehrShoppingDocsBooksBloggerKontakteHangoutsNoch mehr von GoogleAnmeldenAusgeblendete FelderNach Gruppen oder Nachrichten suchen Developer resources Microsoft developer Windows Windows Dev Center Windows apps Desktop Internet of Things Games Holographic Microsoft Edge Hardware Azure Azure Thanks In Advance Dec 27, 2012 at 4:17pm UTC guestgulkan (2942) Yes, I have done some tests. Dec 21, 2012 at 9:15pm UTC tnjgraham (87) Ok, found out that I am Admin on my computer. So here is my change to serialport_win.cpp DCB dcb = { 0 }; dcb.DCBlength = sizeof(DCB); if (data->hupcl == false) { dcb.fDtrControl = DTR_CONTROL_DISABLE; // disable DTR to avoid reset }

DCB dcb; //memset(&dcb, 0, sizeof(DCB)); SecureZeroMemory(&dcb, sizeof(DCB)); // tried this from a suggestion I saw online somewhere dcb.DCBlength = sizeof(DCB); if (!GetCommState(hDevice, &dcb)) { DWORD last_error = ::GetLastError(); CloseHandle(hDevice); exit(1); // printf ("CreateFile failed with error %d.\n", GetLastError()); return (1); } // Build on the current configuration, and skip setting the size // of the input and output buffers with SetupComm. Thanks In Advance Dec 21, 2012 at 10:32pm UTC guestgulkan (2942) I haven't had a PC with serial ports for 5 years now - so I will have to try it Proposed as answer by jinzai Tuesday, October 05, 2010 6:04 PM Marked as answer by Towerdd Wednesday, October 06, 2010 8:17 AM Tuesday, October 05, 2010 4:53 PM Reply | Quote

However, I don't think it is doing what it says. Have you checked to see if all of the necessary parameters of dcb are set with respect to hDevice? But because I don't have the technical background to give the proper answer, I will just comment yours and maybe someone else or you can give the proper answer to it. I'm out on the road at the moment but when I get back I have a PL2303 based USB serial device and a CH340/HL340 based USB serial port plus a short

No new replies allowed. NB: using hyperlink and the same options, I connect to fpga perfectly... :( Tuesday, October 05, 2010 3:07 PM Reply | Quote Answers 2 Sign in to vote The name of O.K. But this function call fails with an error codeERROR_INVALID_FUNCTION.I have a printer driver whose port is COM1, but no print job is giventhrough that driver, when i excute my program.Can anyone

You forgot to post the short program! I use the example code from MSDN "configuring a communications resource". Results 1 to 6 of 6 Thread: GetCommState failed with error 87 Tweet Thread Tools Show Printable Version Email this Page… Subscribe to this Thread… Display Linear Mode Switch to Hybrid I noticed the failure while stepping through the code and ended up in the code below in a boost file.

reading through the definition of `\cfrac` in AMSMath How exactly does mining software work? To start viewing messages, select the forum that you want to visit from the selection below. Actual behavior Error message SetCommState: Unknown error code 87 is displayed. Thanks In Advance Dec 18, 2012 at 8:49pm UTC guestgulkan (2942) Use CreateFile function to get a handle to the com port.

C++ Information Tutorials Reference Articles Forum Forum BeginnersWindows ProgrammingUNIX/Linux ProgrammingGeneral C++ ProgrammingLoungeJobs Home page | Privacy policy© cplusplus.com, 2000-2016 - All rights reserved - v3.1Spotted an error? This is the generic C++ forum, specifically for C++ topics that have nothing to do with Windows. I get a good handle(handle is not INVALID_HANDLE_VALUE).