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  1. #1
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    Default Re: How to transfer file through serial communication

    here's wat i have done

    Qt Code :

    Qt Code:
    1. int size;
    2. int *i,j,k;
    3. QFile file("/sfiles/mxdrv.tgz");
    4. if(!file.open( IO_ReadOnly ))
    5. {
    6. QMessageBox::information(0,"Error","Error opening file");
    7. }
    8. else
    9. {
    10. cout<<"File opened successfully"<<endl;
    11. }
    12. cout<<"file opened...."<<endl;
    13. unsigned char fname[]="mxdrv.tgz";
    14.  
    15. struct termios t;
    16. char *device = "/dev/ttyS0";
    17.  
    18. int sPort, rbyte, status, sPortdest,length;
    19. long count=0;
    20.  
    21. unsigned char send1[32];
    22.  
    23.  
    24. t.c_cc[VMIN] = 1;
    25. t.c_cc[VTIME]=0;
    26. t.c_cc[VEOF]='\n';
    27.  
    28. t.c_iflag |= (ISIG);
    29. t.c_iflag &= ~BRKINT;
    30. t.c_cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
    31.  
    32. sPort = open(device,O_RDWR|O_NOCTTY|O_NDELAY);
    33.  
    34. if(sPort != -1)
    35. {
    36. cout<<"open successfully\n";
    37.  
    38. status = ioctl(sPort,TCSETS,&t);
    39. cout<<"Entering status"<<status<<endl;
    40. if(status==0)
    41. {
    42.  
    43. //for(count=0;count<20;count++)
    44. cout<<"sending name"<<endl;
    45. rbyte=write(sPort,fname,strlen((char *)send1));
    46. //usleep(3000);
    47. cout<<"name sent"<<endl;
    48. cout<<"now sending file"<<endl;
    49. while(!file.atEnd())
    50.  
    51. {
    52. //cout<<"Enter :";
    53. //cin>>send1;
    54. //strcat((char *)send1,"{MSS TYPE-D DAMA}");
    55. // write(sPort,"{012345678}",11);
    56. *i=file.getch();
    57. rbyte=write(sPort,i,sizeof(*i));
    58. cout<<rbyte<<"sent"<<endl;
    59. //cout<<"w b:"<<rbyte<<"\t Time:"<<count<<"\t string:"<<send1<<"\n";
    60. //usleep(1000);
    61.  
    62. }
    63.  
    64. }
    65. close(sPort);
    66.  
    67. }
    68. else
    69. {
    70. cout<<"Device could not be opened";
    71. }
    72. file.close();
    To copy to clipboard, switch view to plain text mode 


    by running this code from the shell, following is the output :

    File opened successfully
    file opened....
    open successfully
    Entering status0
    sending name
    name sent
    now sending file
    Segmentation fault


    can any1 please tell watz going wrong over here ??
    There are 10 kinds of people in this world. Those who understand binary, and those who dont.

    regards
    shamik

  2. #2
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    Default Re: How to transfer file through serial communication

    As far as I can see, int *i is not allocated anywhere.
    You must allocate i before you can use it.

    Regards

  3. #3
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    Default Re: How to transfer file through serial communication

    Don't use "int *i" but "int i". You have an uninitialised pointer. I don't see any reason why would you want to use a pointer to an int, so just use the object directly.

  4. #4
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    Default Re: How to transfer file through serial communication

    sorry
    please refer the post below
    There are 10 kinds of people in this world. Those who understand binary, and those who dont.

    regards
    shamik

  5. #5
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    Default Re: How to transfer file through serial communication

    rather i've used QString with a little bit modification

    Code :
    Qt Code:
    1. int size;
    2. int i,j,k;
    3. QString send="";
    4. QFile file("/sfiles/mxdrv.tgz");
    5. if(!file.open( IO_ReadOnly ))
    6. {
    7. QMessageBox::information(0,"Error","Error opening file");
    8. }
    9. else
    10. {
    11. cout<<"File opened successfully"<<endl;
    12. }
    13. cout<<"file opened...."<<endl;
    14. unsigned char fname[]="mxdrv.tgz";
    15.  
    16. struct termios t;
    17. char *device = "/dev/ttyS0";
    18.  
    19. int sPort, rbyte, status, sPortdest,length;
    20. long count=0;
    21.  
    22. unsigned char send1[32];
    23.  
    24.  
    25. t.c_cc[VMIN] = 1;
    26. t.c_cc[VTIME]=0;
    27. t.c_cc[VEOF]='\n';
    28.  
    29. t.c_iflag |= (ISIG);
    30. t.c_iflag &= ~BRKINT;
    31. t.c_cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
    32.  
    33. sPort = open(device,O_RDWR|O_NOCTTY|O_NDELAY);
    34.  
    35. if(sPort != -1)
    36. {
    37. cout<<"open successfully\n";
    38.  
    39. status = ioctl(sPort,TCSETS,&t);
    40. cout<<"Entering status"<<status<<endl;
    41. if(status==0)
    42. {
    43.  
    44. //for(count=0;count<20;count++)
    45. cout<<"sending name"<<endl;
    46. rbyte=write(sPort,fname,strlen((char *)fname));
    47. //usleep(3000);
    48. cout<<"name sent"<<endl;
    49. cout<<"now sending file"<<endl;
    50. while(!file.atEnd())
    51.  
    52. {
    53. //cout<<"Enter :";
    54. //cin>>send1;
    55. //strcat((char *)send1,"{MSS TYPE-D DAMA}");
    56. // write(sPort,"{012345678}",11);
    57. cout<<"getting byte from file"<<endl;
    58. i=file.getch();
    59. send.sprintf("%d",i);
    60. cout<<send<<endl;
    61. rbyte=write(sPort,send,strlen(send));
    62. cout<<rbyte<<"sent"<<endl;
    63. //cout<<"w b:"<<rbyte<<"\t Time:"<<count<<"\t string:"<<send1<<"\n";
    64. //usleep(1000);
    65.  
    66. }
    67.  
    68. }
    69. close(sPort);
    70.  
    71. }
    72. else
    73. {
    74. cout<<"Device could not be opened";
    75. }
    76. file.close();
    To copy to clipboard, switch view to plain text mode 



    when i run the program from the terminal, the bytes get transfered which i can see in the hyperterminal of some other pc.
    but then after some time the following comes on the terminal and the program exits abruptly:

    *** glibc detected *** ./filetransfer: munmap_chunk(): invalid pointer: 0xbffe8e70 ***
    ======= Backtrace: =========
    /lib/libc.so.6(cfree+0x1bb)[0xe5d67b]
    /usr/lib/libstdc++.so.6(_ZdlPv+0x21)[0x6874871]
    /usr/lib/qt-3.3/lib/libqt-mt.so.3(_ZN7QWidget5closeEb+0x1f6)[0x5198e6]
    ./filetransfer[0x804fdcb]
    ./filetransfer[0x804fa3b]
    /usr/lib/qt-3.3/lib/libqt-mt.so.3(_ZN7QObject15activate_signalEP15QConnectio nListP8QUObject+0x16a)[0x4dbe2a]
    /usr/lib/qt-3.3/lib/libqt-mt.so.3(_ZN7QObject15activate_signalEi+0xbd)[0x4dc95d]
    /usr/lib/qt-3.3/lib/libqt-mt.so.3(_ZN7QButton7clickedEv+0x2c)[0x86f8ac]
    /usr/lib/qt-3.3/lib/libqt-mt.so.3(_ZN7QButton17mouseReleaseEventEP11QMouseEv ent+0xbd)[0x57fa3d]
    /usr/lib/qt-3.3/lib/libqt-mt.so.3(_ZN7QWidget5eventEP6QEvent+0x3c5)[0x5192d5]
    /usr/lib/qt-3.3/lib/libqt-mt.so.3(_ZN12QApplication14internalNotifyEP7QObjec tP6QEvent+0x9b)[0x4730fb]
    /usr/lib/qt-3.3/lib/libqt-mt.so.3(_ZN12QApplication6notifyEP7QObjectP6QEvent +0x287)[0x474757]
    /usr/lib/qt-3.3/lib/libqt-mt.so.3(_ZN9QETWidget19translateMouseEventEPK7_XEv ent+0x576)[0x40af26]
    /usr/lib/qt-3.3/lib/libqt-mt.so.3(_ZN12QApplication15x11ProcessEventEP7_XEve nt+0x5e6)[0x409a26]
    /usr/lib/qt-3.3/lib/libqt-mt.so.3(_ZN10QEventLoop13processEventsEj+0x4eb)[0x41b6ab]
    /usr/lib/qt-3.3/lib/libqt-mt.so.3(_ZN10QEventLoop9enterLoopEv+0x42)[0x48c672]
    /usr/lib/qt-3.3/lib/libqt-mt.so.3(_ZN10QEventLoop4execEv+0x26)[0x48c536]
    /usr/lib/qt-3.3/lib/libqt-mt.so.3(_ZN12QApplication4execEv+0x1f)[0x472c0f]
    ./filetransfer(_ZN7QWidget6createEmbb+0xe2f)[0x804ef2f]
    /lib/lAborted


    any suggestions ??
    There are 10 kinds of people in this world. Those who understand binary, and those who dont.

    regards
    shamik

  6. #6
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    Default Re: How to transfer file through serial communication

    Well, what button did you pressed?
    From the backtrace it seems that you pressed a button.

    BTW, do you use threads in your app?

  7. #7
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    Default Re: How to transfer file through serial communication

    i dont use any threads in the application

    and yes i've pressed a button
    actually after pressing that button the code is executed coz the code is written in the click event of that button
    There are 10 kinds of people in this world. Those who understand binary, and those who dont.

    regards
    shamik

  8. #8
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    Default Re: How to transfer file through serial communication

    What does close(sPort)?
    Can you post the code for that?

  9. #9
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    Default Re: How to transfer file through serial communication

    Is it me or are you trying to send a QString object through the line? I'm surprised it even compiles... Provided that your write() calls really mean ::write() then the second argument should be a pointer to a const char* buffer. Could you paste the real and current code you're using? Because I don't think there is a strlen() variant that takes a QString as well...

  10. #10
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    Default Re: How to transfer file through serial communication

    the code which i've posted b4 is the one which i m using currently.

    if u think sending a QString object cud b erroneous then plz suggest wat 2 use instead. i very well know that the second argument requires const char * but the problem is i dont know how to define/declare it and secondly the getch() function returns an integer, again i donno how to convert that integer into const char * . so i just tried to use QString


    i hope now this is not a difficult question 4 u
    please help...
    There are 10 kinds of people in this world. Those who understand binary, and those who dont.

    regards
    shamik

  11. #11
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    Default Re: How to transfer file through serial communication

    Use QString::toAscii().constData( means const char *).

    Regards

  12. #12
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    Default Re: How to transfer file through serial communication

    And PLEASE - DON'T use sms lingo here! it is so anoying to read it like that, and there is NO reason for it, unless you are posting through WAP on your mobile.
    ==========================signature=============== ==================
    S.O.L.I.D principles (use them!):
    https://en.wikipedia.org/wiki/SOLID_...iented_design)

    Do you write clean code? - if you are TDD'ing then maybe, if not, your not writing clean code.

  13. #13
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    Default Re: How to transfer file through serial communication

    the function as said above doesnt work
    it says theres no such function as QString::toAscii() etc..
    anyways i have done some changes to the code. the entire code is as below :

    Qt Code:
    1. void Form1::send_clicked()
    2. {
    3. int size;
    4. int i,j,k;
    5. QString send;
    6. QFile file("/sfiles/mxdrv.tgz");
    7. if(!file.open( IO_ReadOnly ))
    8. {
    9. QMessageBox::information(0,"Error","Error opening file");
    10. }
    11. else
    12. {
    13. cout<<"File opened successfully"<<endl;
    14. }
    15. cout<<"file opened...."<<endl;
    16. unsigned char fname[]="mxdrv.tgz";
    17. struct termios t;
    18. char *device = "/dev/ttyS0";
    19. int sPort, rbyte, status, sPortdest,length;
    20. long count=0;
    21. unsigned char send1[32];
    22.  
    23. t.c_cc[VMIN] = 1;
    24. t.c_cc[VTIME]=0;
    25. t.c_cc[VEOF]='\n';
    26.  
    27. t.c_iflag |= (ISIG);
    28. t.c_iflag &= ~BRKINT;
    29. t.c_cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
    30.  
    31. sPort = open(device,O_RDWR|O_NOCTTY|O_NDELAY);
    32.  
    33. if(sPort != -1)
    34. {
    35. cout<<"open successfully\n";
    36.  
    37. status = ioctl(sPort,TCSETS,&t);
    38. cout<<"Entering status"<<status<<endl;
    39. if(status==0)
    40. {
    41. //for(count=0;count<20;count++)
    42. cout<<"sending name"<<endl;
    43. rbyte=write(sPort,fname,strlen((char *)fname));
    44. cout<<rbyte<<endl;
    45. QMessageBox::information(0,"sent","Name sent");
    46. //usleep(3000);
    47. cout<<"name sent"<<endl;
    48. cout<<"now sending file"<<endl;
    49. usleep(3000);
    50. while(!file.atEnd())
    51.  
    52. {
    53. //cout<<"Enter :";
    54. //cin>>send1;
    55. //strcat((char *)send1,"{MSS TYPE-D DAMA}");
    56. // write(sPort,"{012345678}",11);
    57. cout<<"getting byte from file"<<endl;
    58. i=file.getch();
    59. GenerateByte(i,send);
    60. //usleep(3000);
    61. rbyte=TEMP_FAILURE_RETRY( write(sPort,send,qstrlen(send)));
    62. cout<<rbyte<<"sent"<<endl;
    63. //cout<<"w b:"<<rbyte<<"\t Time:"<<count<<"\t string:"<<send1<<"\n";
    64. //usleep(1000);
    65.  
    66. }
    67.  
    68. }
    69. close(sPort);
    70. }
    71. else
    72. {
    73. cout<<"Device could not be opened";
    74. }
    75. file.close();
    76. }
    77. void Form1::GenerateByte(int i, QString &ssend)
    78. {
    79. ssend.sprintf("%d",i);
    80. }
    To copy to clipboard, switch view to plain text mode 
    and about using the QString object in write() function, i have checked it with the previous code of my project, and it is working fine. The only thing is instead of strlen() i have to use qstrlen().
    the code which i have pasted above doesnt give any error while compiling but while transferring file what happens exactly is that the write() function sometimes returns some positive integer and sometimes returnds -1. but most of the time it returns -1.
    then after some time the following comes on the terminal :
    *** glibc detected *** ./filetransfer: munmap_chunk(): invalid pointer: 0xbfab4940 ***
    ======= Backtrace: =========
    /lib/libc.so.6(cfree+0x1bb)[0xbb267b]
    /usr/lib/libstdc++.so.6(_ZdlPv+0x21)[0x6874871]
    /usr/lib/qt-3.3/lib/libqt-mt.so.3(_ZN7QWidget5closeEb+0x1f6)[0x5198e6]
    ./filetransfer[0x8050af0]
    ./filetransfer[0x804fb7f]
    /usr/lib/qt-3.3/lib/libqt-mt.so.3(_ZN7QObject15activate_signalEP15QConnectio nListP8QUObject+0x16a)[0x4dbe2a]
    /usr/lib/qt-3.3/lib/libqt-mt.so.3(_ZN7QObject15activate_signalEi+0xbd)[0x4dc95d]
    /usr/lib/qt-3.3/lib/libqt-mt.so.3(_ZN7QButton7clickedEv+0x2c)[0x86f8ac]
    /usr/lib/qt-3.3/lib/libqt-mt.so.3(_ZN7QButton15keyReleaseEventEP9QKeyEvent+0 x5a)[0x57fd5a]
    /usr/lib/qt-3.3/lib/libqt-mt.so.3(_ZN7QWidget5eventEP6QEvent+0x325)[0x519235]
    /usr/lib/qt-3.3/lib/libqt-mt.so.3(_ZN12QApplication14internalNotifyEP7QObjec tP6QEvent+0x9b)[0x4730fb]
    /usr/lib/qt-3.3/lib/libqt-mt.so.3(_ZN12QApplication6notifyEP7QObjectP6QEvent +0x54d)[0x474a1d]
    /usr/lib/qt-3.3/lib/libqt-mt.so.3(_ZN9QETWidget17translateKeyEventEPK7_XEven tb+0x36a)[0x408b0a]
    /usr/lib/qt-3.3/lib/libqt-mt.so.3(_ZN12QApplication15x11ProcessEventEP7_XEve nt+0x635)[0x409a75]
    /usr/lib/qt-3.3/lib/libqt-mt.so.3(_ZN10QEventLoop13processEventsEj+0x4eb)[0x41b6ab]
    /usr/lib/qt-3.3/lib/libqt-mt.so.3(_ZN10QEventLoop9enterLoopEv+0x42)[0x48c672]
    /usr/lib/qt-3.3/lib/libqt-mt.so.3(_ZN10QEventLoop4execEv+0x26)[0x48c536]
    /usr/lib/qt-3.3/lib/libqt-mt.so.3(_ZN12QApplication4execEv+0x1f)[0x472c0f]
    ./filetransfer(_ZN7QWidget6createEmbb+0xe37)[0x804f04f]
    /lib/libc.so.6(__libc_start_main+0xdc)[0xb5ef2c]
    ./filetransfer(_ZN11KMainWindow10setCaptionERK7QStri ngb+0x49)[0x804e391]
    ======= Memory map: ========
    00101000-00117000 r-xp 00000000 03:07 483707 /usr/lib/libart_lgpl_2.so.2.3.17
    00117000-00118000 rwxp 00016000 03:07 483707 /usr/lib/libart_lgpl_2.so.2.3.17
    00118000-0012d000 r-xp 00000000 03:07 686877 /usr/lib/qt-3.3/plugins/styles/bluecurve.so
    0012d000-0012e000 rwxp 00015000 03:07 686877 /usr/lib/qt-3.3/plugins/styles/bluecurve.so
    00132000-00163000 r-xp 00000000 03:07 483702 /usr/lib/liblcms.so.1.0.15
    00163000-00164000 rwxp 00030000 03:07 483702 /usr/lib/liblcms.so.1.0.15
    00164000-00167000 rwxp 00164000 00:00 0
    00167000-00170000 r-xp 00000000 03:07 487954 /lib/libnss_files-2.5.so
    00170000-00171000 r-xp 00008000 03:07 487954 /lib/libnss_files-2.5.so
    00171000-00172000 rwxp 00009000 03:07 487954 /lib/libnss_files-2.5.so
    00193000-001a5000 r-xp 00000000 03:07 483704 /usr/lib/libXft.so.2.1.2
    001a5000-001a6000 rwxp 00012000 03:07 483704 /usr/lib/libXft.so.2.1.2
    001a8000-00210000 r-xp 00000000 03:07 483703 /usr/lib/libmng.so.1.0.0
    00210000-00213000 rwxp 00067000 03:07 483703 /usr/lib/libmng.so.1.0.0
    00215000-00224000 r-xp 00000000 03:07 1329158 /lib/libresolv-2.5.so
    00224000-00225000 r-xp 0000e000 03:07 1329158 /lib/libresolv-2.5.so
    00225000-00226000 rwxp 0000f000 03:07 1329158 /lib/libresolv-2.5.so
    00226000-00228000 rwxp 00226000 00:00 0
    0022a000-00a5b000 r-xp 00000000 03:07 196091 /usr/lib/qt-3.3/lib/libqt-mt.so.3.3.6
    00a5b000-00a9c000 rwxp 00830000 03:07 196091 /usr/lib/qt-3.3/lib/libqt-mt.so.3.3.6
    00a9c000-00aa0000 rwxp 00a9c000 00:00 0
    00ab3000-00ac2000 r-xp 00000000 03:07 483684 /usr/lib/libXext.so.6.4.0
    00ac2000-00ac3000 rwxp 0000e000 03:07 483684 /usr/lib/libXext.so.6.4.0
    00ac3000-00ac4000 r-xp 00ac3000 00:00 0 [vdso]
    00ac5000-00ae4000 r-xp 00000000 03:07 1329151 /lib/libexpat.so.0.5.0
    00ae4000-00ae6000 rwxp 0001e000 03:07 1329151 /lib/libexpat.so.0.5.0
    00ae8000-00b0f000 r-xp 00000000 03:07 483675 /usr/lib/libfontconfig.so.1.1.0
    00b0f000-00b17000 rwxp 00027000 03:07 483675 /usr/lib/libfontconfig.so.1.1.0
    00b19000-00b21000 r-xp 00000000 03:07 483680 /usr/lib/libXrender.so.1.3.0
    00b21000-00b22000 rwxp 00007000 03:07 483680 /usr/lib/libXrender.so.1.3.0
    00b24000-00b28000 r-xp 00000000 03:07 483688 /usr/lib/libXfixes.so.3.1.0
    00b28000-00b29000 rwxp 00003000 03:07 483688 /usr/lib/libXfixes.so.3.1.0
    00b2c000-00b45000 r-xp 00000000 03:07 1329142 /lib/ld-2.5.so
    00b45000-00b46000 r-xp 00018000 03:07 1329142 /lib/ld-2.5.so
    00b46000-00b47000 rwxp 00019000 03:07 1329142 /lib/ld-2.5.so
    00b49000-00c80000 r-xp 00000000 03:07 1329143 /lib/libc-2.5.so
    00c80000-00c82000 r-xp 00137000 03:07 1329143 /lib/libc-2.5.so
    00c82000-00c83000 rwxp 00139000 03:07 1329143 /lib/libc-2.5.so
    00c83000-00c86000 rwxp 00c83000 00:00 0
    00c88000-00cad000 r-xp 00000000 03:07 1329150 /lib/libm-2.5.so
    00cad000-00cae000 r-xp 00024000 03:07 1329150 /lib/libm-2.5.so
    00cae000-00caf000 rwxp 00025000 03:07 1329150 /lib/libm-2.5.so
    00cb1000-00cb3000 r-xp 00000000 03:07 1329144 /lib/libdl-2.5.so
    00cb3000-00cb4000 r-xp 00001000 03:07 1329144 /lib/libdl-2.5.so
    00cb4000-00cb5000 rwxp 00002000 03:07 1329144 /lib/libdl-2.5.so
    00cb7000-00cca000 r-xp 00000000 03:07 1329145 /lib/libpthread-2.5.so
    00cca000-00ccb000 r-xp 00012000 03:07 1329145 /lib/libpthread-2.5.so
    00ccb000-00ccc000 rwxp 00013000 03:07 1329145 /lib/libpthread-2.5.so
    00ccc000-00cce000 rwxp 00ccc000 00:00 0
    00cd0000-00ce2000 r-xp 00000000 03:07 483673 /usr/lib/libz.so.1.2.3
    00ce2000-00ce3000 rwxp 00011000 03:07 483673 /usr/lib/libz.so.1.2.3
    00ce5000-00cea000 r-xp 00000000 03:07 483678 /usr/lib/libXdmcp.so.6.0.0
    00cea000-00ceb000 rwxp 00004000 03:07 483678 /usr/lib/libXdmcp.so.6.0.0
    00ced000-00cef000 r-Aborted

    i dont know wat does this mean.

    can any1 please find watz going wrong
    There are 10 kinds of people in this world. Those who understand binary, and those who dont.

    regards
    shamik

  14. #14
    Join Date
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    Default Re: How to transfer file through serial communication

    When I said QString::toAscii().constData() I meant the method name and location.
    But now I see you're using Qt3. Sorry about that .
    In Qt3 you must use send.ascii(). This will give you a const char*.
    And you must use this, because the code is still not correct.

    For length, you can use send.length() or send.size(). I don't know which one is available in Qt3.

    Regards

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