Question

How to convert this C++ (CBuilder) Code to Delphi / Pascal

Asked by: akunyer

I'm trying to convert this few lines of codes below in C++ code for calculating the CRC and getting the data from the ModBus hardware. Could someone who are good in BCB conversion into Delphi can help me. At least 80% of the code can be convert is very helpful. I'm stuck at this point nearly 1 month . Below are some of the codes. Thanks.

unsigned short crc16table[256] =
	{
	0x0000, 0xc0c1, 0xc181, 0x0140, 0xc301, 0x03c0, 0x0280, 0xc241,
	0xc601, 0x06c0, 0x0780, 0xc741, 0x0500, 0xc5c1, 0xc481, 0x0440,
	0xcc01, 0x0cc0, 0x0d80, 0xcd41, 0x0f00, 0xcfc1, 0xce81, 0x0e40,
	0x0a00, 0xcac1, 0xcb81, 0x0b40, 0xc901, 0x09c0, 0x0880, 0xc841,
	0xd801, 0x18c0, 0x1980, 0xd941, 0x1b00, 0xdbc1, 0xda81, 0x1a40,
	0x1e00, 0xdec1, 0xdf81, 0x1f40, 0xdd01, 0x1dc0, 0x1c80, 0xdc41,
	0x1400, 0xd4c1, 0xd581, 0x1540, 0xd701, 0x17c0, 0x1680, 0xd641,
	0xd201, 0x12c0, 0x1380, 0xd341, 0x1100, 0xd1c1, 0xd081, 0x1040,
	0xf001, 0x30c0, 0x3180, 0xf141, 0x3300, 0xf3c1, 0xf281, 0x3240,
	0x3600, 0xf6c1, 0xf781, 0x3740, 0xf501, 0x35c0, 0x3480, 0xf441,
	0x3c00, 0xfcc1, 0xfd81, 0x3d40, 0xff01, 0x3fc0, 0x3e80, 0xfe41,
	0xfa01, 0x3ac0, 0x3b80, 0xfb41, 0x3900, 0xf9c1, 0xf881, 0x3840,
	0x2800, 0xe8c1, 0xe981, 0x2940, 0xeb01, 0x2bc0, 0x2a80, 0xea41,
	0xee01, 0x2ec0, 0x2f80, 0xef41, 0x2d00, 0xedc1, 0xec81, 0x2c40,
	0xe401, 0x24c0, 0x2580, 0xe541, 0x2700, 0xe7c1, 0xe681, 0x2640,
	0x2200, 0xe2c1, 0xe381, 0x2340, 0xe101, 0x21c0, 0x2080, 0xe041,
	0xa001, 0x60c0, 0x6180, 0xa141, 0x6300, 0xa3c1, 0xa281, 0x6240,
	0x6600, 0xa6c1, 0xa781, 0x6740, 0xa501, 0x65c0, 0x6480, 0xa441,
	0x6c00, 0xacc1, 0xad81, 0x6d40, 0xaf01, 0x6fc0, 0x6e80, 0xae41,
	0xaa01, 0x6ac0, 0x6b80, 0xab41, 0x6900, 0xa9c1, 0xa881, 0x6840,
	0x7800, 0xb8c1, 0xb981, 0x7940, 0xbb01, 0x7bc0, 0x7a80, 0xba41,
	0xbe01, 0x7ec0, 0x7f80, 0xbf41, 0x7d00, 0xbdc1, 0xbc81, 0x7c40,
	0xb401, 0x74c0, 0x7580, 0xb541, 0x7700, 0xb7c1, 0xb681, 0x7640,
	0x7200, 0xb2c1, 0xb381, 0x7340, 0xb101, 0x71c0, 0x7080, 0xb041,
	0x5000, 0x90c1, 0x9181, 0x5140, 0x9301, 0x53c0, 0x5280, 0x9241,
	0x9601, 0x56c0, 0x5780, 0x9741, 0x5500, 0x95c1, 0x9481, 0x5440,
	0x9c01, 0x5cc0, 0x5d80, 0x9d41, 0x5f00, 0x9fc1, 0x9e81, 0x5e40,
	0x5a00, 0x9ac1, 0x9b81, 0x5b40, 0x9901, 0x59c0, 0x5880, 0x9841,
	0x8801, 0x48c0, 0x4980, 0x8941, 0x4b00, 0x8bc1, 0x8a81, 0x4a40,
	0x4e00, 0x8ec1, 0x8f81, 0x4f40, 0x8d01, 0x4dc0, 0x4c80, 0x8c41,
	0x4400, 0x84c1, 0x8581, 0x4540, 0x8701, 0x47c0, 0x4680, 0x8641,
	0x8201, 0x42c0, 0x4380, 0x8341, 0x4100, 0x81c1, 0x8081, 0x4040
	};
 
unsigned int TForm1::calCrc(unsigned char *cp, int len)
{
	int i, index, crc=0xffff;
 
	for(i=0;i<len;i++,cp++) {
		index = ((crc ^ *cp) & 0x00ff);
		crc = ((crc >> 8) & 0x00ff) ^ crc16table[index];
	}
	return(crc);
}
 
void __fastcall TForm1::Timer3Timer(TObject *Sender)
{
    Timer3->Enabled = false;
 
    unsigned char mstr[1000];
    char str[5000], s[10];
    mstr[0] = address;
    mstr[1] = 0x03;
    mstr[2] = 0x00;
    mstr[3] = 0x00;
    mstr[4] = 0x00;
    mstr[5] = 27;
    unsigned int crc = calCrc(mstr,6);
    mstr[6] = (unsigned char)(crc & 0x00ff);
    mstr[7] = (unsigned char)(crc >> 8);
    IdUDPClient1->SendBuffer(mstr, 8);
 
    int b = IdUDPClient1->ReceiveBuffer(mstr, 1000, 3000);
    sprintf(str,"%d: ", b);
    for(int i=0;i<b;i++) {
        sprintf(s,"%2.2x ",mstr[i]);
        strcat(str,s);
    }
    Edit3->Text = str;
 
    IdUDPClient1->Active = false;
}
 
 
 
 
void __fastcall TForm1::ServerSocket1ClientRead(TObject *Sender,
      TCustomWinSocket *Socket)
{
    AnsiString buf = Socket->ReceiveText();
    Memo1->Lines->Add(buf);
 
    char command[100], add[100];
    int a;
    sscanf(buf.c_str(), "%s %s %d", command, add, &a);
 
    IdUDPClient1->Host = add;
    IdUDPClient1->Port = 10002;         // port no used
    IdUDPClient1->Active = true;
 
    replySocket = Socket;
 
    AnsiString c = StrUpper(command);
    if(c == "RETRIEVE") {
        mstr[0] = a;
        mstr[1] = 0x03;
        mstr[2] = 0x00;
        mstr[3] = 0x00;
        mstr[4] = 0x00;
        mstr[5] = 27;
        unsigned int crc = calCrc(mstr,6);
        mstr[6] = (unsigned char)(crc & 0x00ff);
        mstr[7] = (unsigned char)(crc >> 8);
 
        mstrLen = 8;
        // set to receive
        Timer2->Enabled = true;
    }
 
    if(c == "CLEAR") {
        mstr[0] = a;
        mstr[1] = 0x06;
        mstr[2] = 0x00;
        mstr[3] = 0x00;
        mstr[4] = 0x00;
        mstr[5] = 0x00;
        unsigned int crc = calCrc(mstr,6);
        mstr[6] = (unsigned char)(crc & 0x00ff);
        mstr[7] = (unsigned char)(crc >> 8);
 
        mstrLen = 8;
        // set to receive
        Timer2->Enabled = true;
    }
}
//---------------------------------------------------------------------------
 
void __fastcall TForm1::Timer2Timer(TObject *Sender)
{
    Timer2->Enabled = false;
 
    // set flag waiting for response
    waitFlag = true;
    // send command
    char str[100], reply[1000];
 
    IdUDPClient1->SendBuffer(mstr, mstrLen);
    int b = IdUDPClient1->ReceiveBuffer(mstr, 1000, 3000);
    if(b == 59) {
 
        float f;
        unsigned int val1, val2;
        // translate
        strcpy(reply,"");
        val1 = (mstr[3] << 8) + mstr[4];
        val2 = (mstr[5] << 8) + mstr[6];
        f = (val1 * 0.0078125) + (val2 * 512.0);        // KWH
        sprintf(str,"%7.3f ", f);
        strcat(reply,str);
 
        // KW
        val1 = (mstr[7] << 8) + mstr[8];
        sprintf(str,"%7.3f ", val1 * 0.004);
        strcat(reply,str);
 
        // KVAR
        val1 = (mstr[9] << 8) + mstr[10];
        sprintf(str,"%7.3f ", val1 * 0.004);
        strcat(reply,str);
 
        // VA
        val1 = (mstr[11] << 8) + mstr[12];
        sprintf(str,"%7.3f ", val1 * 0.004);
        strcat(reply,str);
 
        // power factor
        val1 = (mstr[13] << 8) + mstr[14];
        sprintf(str,"%5.3f ", val1 * 0.000030518);
        strcat(reply,str);
 
        // volt
        val1 = (mstr[15] << 8) + mstr[16];
        sprintf(str,"%7.3f ", val1 * 0.03125);
        strcat(reply,str);
 
        // volt
        val1 = (mstr[17] << 8) + mstr[18];
        sprintf(str,"%7.3f ", val1 * 0.015625);
        strcat(reply,str);
 
        // amp
        val1 = (mstr[19] << 8) + mstr[20];
        sprintf(str,"%7.3f ", val1 * 0.0039063);
        strcat(reply,str);
 
        // kw
        val1 = (mstr[21] << 8) + mstr[22];
        sprintf(str,"%7.3f ", val1 * 0.001);
        strcat(reply,str);
 
        // kw
        val1 = (mstr[23] << 8) + mstr[24];
        sprintf(str,"%7.3f ", val1 * 0.001);
        strcat(reply,str);
 
        // kw
        val1 = (mstr[25] << 8) + mstr[26];
        sprintf(str,"%7.3f ", val1 * 0.001);
        strcat(reply,str);
 
        // power factor
        val1 = (mstr[27] << 8) + mstr[28];
        sprintf(str,"%5.3f ", val1 * 0.000030518);
        strcat(reply,str);
 
        // power factor
        val1 = (mstr[29] << 8) + mstr[30];
        sprintf(str,"%5.3f ", val1 * 0.000030518);
        strcat(reply,str);
 
        // power factor
        val1 = (mstr[31] << 8) + mstr[32];
        sprintf(str,"%5.3f ", val1 * 0.000030518);
        strcat(reply,str);
 
        // volt
        val1 = (mstr[33] << 8) + mstr[34];
        sprintf(str,"%7.3f ", val1 * 0.03125);
        strcat(reply,str);
 
        // volt
        val1 = (mstr[35] << 8) + mstr[36];
        sprintf(str,"%7.3f ", val1 * 0.03125);
        strcat(reply,str);
 
        // volt
        val1 = (mstr[37] << 8) + mstr[38];
        sprintf(str,"%7.3f ", val1 * 0.03125);
        strcat(reply,str);
 
        // volt
        val1 = (mstr[39] << 8) + mstr[40];
        sprintf(str,"%7.3f ", val1 * 0.015625);
        strcat(reply,str);
 
        // volt
        val1 = (mstr[41] << 8) + mstr[42];
        sprintf(str,"%7.3f ", val1 * 0.015625);
        strcat(reply,str);
 
        // volt
        val1 = (mstr[43] << 8) + mstr[44];
        sprintf(str,"%7.3f ", val1 * 0.015625);
        strcat(reply,str);
 
        // amps
        val1 = (mstr[45] << 8) + mstr[46];
        sprintf(str,"%7.3f ", val1 * 0.0039063);
        strcat(reply,str);
 
        // amps
        val1 = (mstr[47] << 8) + mstr[48];
        sprintf(str,"%7.3f ", val1 * 0.0039063);
        strcat(reply,str);
 
        // amps
        val1 = (mstr[49] << 8) + mstr[50];
        sprintf(str,"%7.3f ", val1 * 0.0039063);
        strcat(reply,str);
 
        // kw
        val1 = (mstr[51] << 8) + mstr[52];
        sprintf(str,"%7.3f ", val1 * 0.004);
        strcat(reply,str);
 
        // kw
        val1 = (mstr[53] << 8) + mstr[54];
        sprintf(str,"%7.3f ", val1 * 0.004);
        strcat(reply,str);
 
        // amps
        val1 = (mstr[55] << 8) + mstr[56];
        sprintf(str,"%7.3f ", val1 * 0.004);
        strcat(reply,str);
 
        // send to replySocket
        replySocket->SendBuf(reply, strlen(reply));
 
        // log
        Memo1->Lines->Add(reply);
    }
    else {
        // error
        sprintf(str,"%d chars received - ",b);
        if(!b)
            strcpy(reply,"0");  // no reply
        else {
            if(mstr[1] == 0x06) {
                // clear kWH, send MSB address 0001
                mstr[3] = 0x01;
                unsigned int crc = calCrc(mstr,6);
                mstr[6] = (unsigned char)(crc & 0x00ff);
                mstr[7] = (unsigned char)(crc >> 8);
                IdUDPClient1->SendBuffer(mstr, mstrLen);
                b = IdUDPClient1->ReceiveBuffer(mstr, 1000, 3000);
            }
            strcpy(reply,"OK"); // presumably ok
        }
        replySocket->SendBuf(reply, strlen(reply));
        strcat(str,reply);
        Memo1->Lines->Add(str);
    }
    IdUDPClient1->Active = false;   // close connection
}
//---------------------------------------------------------------------------

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Asked On: 2009-08-24 at 18:04:39ID24678491
Tags: Delphi
,; Cbuilder
,; CBB
Topics: C++ Builder
,; Delphi IDE
,; C Programming Language
Participating Experts: 1
Points: 20
Comments: 2

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Answers

by: Geert_GruwezPosted on 2009-08-25 at 07:13:17ID: 25177789

here is the CRC check unit

(*************************************************
 
   CRC32 Library for Delphi(tm)
   Copyright © 2002 NAG Software Solutions
   All rights reserved
 
   http://www.nagsoftware.com/
 
   Please refer to the included README.TXT
   for details.
 
*************************************************)
 
unit CRC32;
 
interface
 
uses
  Classes, SysUtils;
 
const
  ValueTable: array [0..255] of Longword =
   ($00000000, $77073096, $ee0e612c, $990951ba,
    $076dc419, $706af48f, $e963a535, $9e6495a3,
    $0edb8832, $79dcb8a4, $e0d5e91e, $97d2d988,
    $09b64c2b, $7eb17cbd, $e7b82d07, $90bf1d91,
    $1db71064, $6ab020f2, $f3b97148, $84be41de,
    $1adad47d, $6ddde4eb, $f4d4b551, $83d385c7,
    $136c9856, $646ba8c0, $fd62f97a, $8a65c9ec,
    $14015c4f, $63066cd9, $fa0f3d63, $8d080df5,
    $3b6e20c8, $4c69105e, $d56041e4, $a2677172,
    $3c03e4d1, $4b04d447, $d20d85fd, $a50ab56b,
    $35b5a8fa, $42b2986c, $dbbbc9d6, $acbcf940,
    $32d86ce3, $45df5c75, $dcd60dcf, $abd13d59,
    $26d930ac, $51de003a, $c8d75180, $bfd06116,
    $21b4f4b5, $56b3c423, $cfba9599, $b8bda50f,
    $2802b89e, $5f058808, $c60cd9b2, $b10be924,
    $2f6f7c87, $58684c11, $c1611dab, $b6662d3d,
    $76dc4190, $01db7106, $98d220bc, $efd5102a,
    $71b18589, $06b6b51f, $9fbfe4a5, $e8b8d433,
    $7807c9a2, $0f00f934, $9609a88e, $e10e9818,
    $7f6a0dbb, $086d3d2d, $91646c97, $e6635c01,
    $6b6b51f4, $1c6c6162, $856530d8, $f262004e,
    $6c0695ed, $1b01a57b, $8208f4c1, $f50fc457,
    $65b0d9c6, $12b7e950, $8bbeb8ea, $fcb9887c,
    $62dd1ddf, $15da2d49, $8cd37cf3, $fbd44c65,
    $4db26158, $3ab551ce, $a3bc0074, $d4bb30e2,
    $4adfa541, $3dd895d7, $a4d1c46d, $d3d6f4fb,
    $4369e96a, $346ed9fc, $ad678846, $da60b8d0,
    $44042d73, $33031de5, $aa0a4c5f, $dd0d7cc9,
    $5005713c, $270241aa, $be0b1010, $c90c2086,
    $5768b525, $206f85b3, $b966d409, $ce61e49f,
    $5edef90e, $29d9c998, $b0d09822, $c7d7a8b4,
    $59b33d17, $2eb40d81, $b7bd5c3b, $c0ba6cad,
    $edb88320, $9abfb3b6, $03b6e20c, $74b1d29a,
    $ead54739, $9dd277af, $04db2615, $73dc1683,
    $e3630b12, $94643b84, $0d6d6a3e, $7a6a5aa8,
    $e40ecf0b, $9309ff9d, $0a00ae27, $7d079eb1,
    $f00f9344, $8708a3d2, $1e01f268, $6906c2fe,
    $f762575d, $806567cb, $196c3671, $6e6b06e7,
    $fed41b76, $89d32be0, $10da7a5a, $67dd4acc,
    $f9b9df6f, $8ebeeff9, $17b7be43, $60b08ed5,
    $d6d6a3e8, $a1d1937e, $38d8c2c4, $4fdff252,
    $d1bb67f1, $a6bc5767, $3fb506dd, $48b2364b,
    $d80d2bda, $af0a1b4c, $36034af6, $41047a60,
    $df60efc3, $a867df55, $316e8eef, $4669be79,
    $cb61b38c, $bc66831a, $256fd2a0, $5268e236,
    $cc0c7795, $bb0b4703, $220216b9, $5505262f,
    $c5ba3bbe, $b2bd0b28, $2bb45a92, $5cb36a04,
    $c2d7ffa7, $b5d0cf31, $2cd99e8b, $5bdeae1d,
    $9b64c2b0, $ec63f226, $756aa39c, $026d930a,
    $9c0906a9, $eb0e363f, $72076785, $05005713,
    $95bf4a82, $e2b87a14, $7bb12bae, $0cb61b38,
    $92d28e9b, $e5d5be0d, $7cdcefb7, $0bdbdf21,
    $86d3d2d4, $f1d4e242, $68ddb3f8, $1fda836e,
    $81be16cd, $f6b9265b, $6fb077e1, $18b74777,
    $88085ae6, $ff0f6a70, $66063bca, $11010b5c,
    $8f659eff, $f862ae69, $616bffd3, $166ccf45,
    $a00ae278, $d70dd2ee, $4e048354, $3903b3c2,
    $a7672661, $d06016f7, $4969474d, $3e6e77db,
    $aed16a4a, $d9d65adc, $40df0b66, $37d83bf0,
    $a9bcae53, $debb9ec5, $47b2cf7f, $30b5ffe9,
    $bdbdf21c, $cabac28a, $53b39330, $24b4a3a6,
    $bad03605, $cdd70693, $54de5729, $23d967bf,
    $b3667a2e, $c4614ab8, $5d681b02, $2a6f2b94,
    $b40bbe37, $c30c8ea1, $5a05df1b, $2d02ef8d);
 
function CalculateCRC(FileName: string): Longword;
function CalculateCRCFromStream(var Stream: TFileStream): Longword;
 
implementation
 
function CalculateCRCFromStream(var Stream: TFileStream): Longword;
var
  Buffer: array[1..8192] of Byte;
  I, ReadCount: Integer;
  TempResult: Longword;
begin
  {Calculate the CRC32 image for Stream}
  TempResult := $FFFFFFFF;
  while (Stream.Position <> Stream.Size) do begin
    ReadCount := Stream.Read(Buffer, SizeOf(Buffer));
    for I := 1 to ReadCount do
      TempResult := ((TempResult shr 8) and $FFFFFF) xor ValueTable[(TempResult xor Longword(Buffer[I])) and $FF];
  end;
  Result := not TempResult;
end;
 
function CalculateCRC(FileName: string): Longword;
var
  Stream: TFileStream;
begin
  {Create a stream to hold the file specified by FileName}
  Stream := TFileStream.Create(FileName, fmOpenRead or fmShareDenyWrite);
  {Attempt to calculate the CRC32 for the stream}
  try
    Result := CalculateCRCFromStream(Stream);
  finally
    Stream.Free;
  end;
end;
 
end.

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by: akunyerPosted on 2009-08-31 at 18:42:17ID: 25227975

Looks like its is hard for people to help me. Anyway , i already convert it myself . lol

20120131-EE-VQP-002

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How to convert this C++ (CBuilder) Code to Delphi / Pascal

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