Createfile Com1 Error 2
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million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up CreateFile COM port error 2 up vote 0 down vote favorite I'm trying to open and write to a
Createfile Error_file_not_found
COM serial port on Windows 7, using below code in Visual Studio 2012 (C++) printf("argv[2]= '%s'\n", argv[2]); m_hCommPortSend= ::CreateFile(argv[2] ,GENERIC_READ|GENERIC_WRITE,0,0,OPEN_EXISTING,0,0); if(m_hCommPortSend == INVALID_HANDLE_VALUE) { printf("%s error: %d\n", argv[2], GetLastError()); return -1; } This Code works well with argv[2] as COM1 or COM7 I have another com port COM39, When I pass COM39 as argv[2] it is not openeded GetLastError() returning 2. Not sure why ? c++ serial-port share|improve this question asked Jul createfile example 7 '15 at 15:43 Ashok 194110 add a comment| 1 Answer 1 active oldest votes up vote 4 down vote accepted The MSDN page for CreateFile says the following under Communications Resources: To specify a COM port number greater than 9, use the following syntax: \\.\COM10. This syntax works for all port numbers and hardware that allows COM port numbers to be specified. share|improve this answer edited Jul 7 '15 at 17:41 Hans Passant 653k819531601 answered Jul 7 '15 at 16:25 ScottMcP-MVP 8,9592613 yes, I tried the same It worked. Thanks –Ashok Jul 7 '15 at 18:08 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign up using Facebook Sign up using Email and Password Post as a guest Name Email Post as a guest Name Email discard By posting your answer, you agree to the privacy policy and terms of service. Not the answer you're looking for? Browse other questions tagged c++ serial-port or ask your own question. asked 1 year ago viewed 577 times active 1 year ago Related 4How to set DTR/RTS state that will be used when CreateFile() opens COM port1Writing to a Serial (Com) Port in Visual C++0C++ COM port Opening, Reading and Writing1Reading data from serial por
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Createfile Com Port
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for Help Receive Real-Time Help Create a Freelance Project Hire for a Full Time Job Ways to Get Help Ask a Question Ask for Help Receive Real-Time Help Create a Freelance Project Hire for a Full Time Job Ways to Get https://www.experts-exchange.com/questions/27217546/CreateFile-COM-port.html Help Expand Search Submit Close Search Login Join Today Products BackProducts Gigs Live Careers Vendor Services Groups Website Testing Store Headlines Experts Exchange > Questions > CreateFile COM port Want to Advertise Here? Solved CreateFile http://superuser.com/questions/893275/cannot-open-port-in-a-dll-project COM port Posted on 2011-07-22 C C++ Windows XP 1 Verified Solution 10 Comments 3,157 Views Last Modified: 2012-08-13 I'm trying to write a simple application in C to read and write data to a error 2 serial port. The environment is Visual Studio 2005 running under Windows XP. I'm using the CreateFile function to create a handle to the COM port. However, it always returns INVALID_HANDLE_VALUE. The getLastError code, 2, tells me the file does not exist. I'm certain COM1 exists because it shows up in device manager and I can use another terminal application (TeraTerm) and it shows up there. I've tried this on two different createfile com1 error system both with known good COM1 ports. A reboot doesn't help. I tried this with a different COM port (COM7) that I'm sure exists and get the same results. I'm running with administrative privileges. I've tried using just "COM1" as the argument with no difference. Any idea why this code doesn't think the com port exists? The attached code produces the following output: Error creating COM1 Error code: 2 Port does not exist HANDLE hCom; hCom = CreateFile("\\\\.\\COM1", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL); if (hCom == INVALID_HANDLE_VALUE){ printf("Error creating COM1 \n"); error = GetLastError(); printf("Error code: %i\n", error); if (error == ERROR_FILE_NOT_FOUND){ printf("Port does not exist\n"); } return FALSE; } printf("Success creating COM1 handle\n"); Select all Open in new window 0 Question by:JohnSantaFe Facebook Twitter LinkedIn Google LVL 8 Best Solution bySubrat (C++ windows/Linux) const char* port_name=TEXT("COM1"); Go to Solution 9 Comments LVL 86 Overall: Level 86 C++ 72 C 28 Windows XP 16 Message Expert Comment by:jkr2011-07-22 Well. just a small issue - make that HANDLE hCom; hCom = CreateFile("COM1", GENERIC_READ | GENERIC_WRITE, 0
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Super User Questions Tags Users Badges Unanswered Ask Question _ Super User is a question and answer site for computer enthusiasts and power users. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top “cannot open port!” in a DLL project [closed] up vote -3 down vote favorite 1 I made a C Console Application in Visual Studio in order to access one of the COM ports with the following code and all went well. #include