문자열 API

snprintf(목적 버퍼, 복사할 사이즈, 포맷, 아규먼트)

char source[100]="abcdef";

char dest[100];

strncpy(dest, source, 4); // 4 byte copy (4 char)

0000: 61 62 63 64 E0 F7 8C 23 30 F8 8C 23 00 2C 6C 80   abcd...#0..#.,l.

0010: 00 04 00 00 00 04 00 00 00 00 00 00 00 80 01 00   ................

strncpyz(dest, source, 4);// 4 byte copy (3 char + null)

0000: 61 62 63 00 E0 F7 8C 23 30 F8 8C 23 00 DC 6A 80   abc....#0..#..j.

0010: 00 04 00 00 00 04 00 00 00 00 00 00 00 80 01 00   ................

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_snprintf(char *, size_t, const char *, ...);

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char msg[255] = {1,2,3,4};

char dst[255] = {0,};

(void)_snprintf(dst, 8, "%08X", msg[0]);

0000: 30 30 30 30 30 30 30 31 00 00 00 00 00 00 00 00   00000001........

0010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00   ................

0020: 00 00 00 00 00 00 00 00                           ........        

8 : dst 에 size 만큼 copy 할지 ex) memcpy(dst,source, 8) 

"%08X" : 스트링 버퍼 이다.

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PHONE MSG 

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GSMHex = "0791280102198188440AA15117180890008401802291018263130A22080B811040309814F761623132B0A1B3AA" //KSC5601

097192 0x30 0x37 0x39 0x31 0x32 0x38 0x30 0x31 0x30 0x32 0x31 0x39 0x38 0x31 0x38 0x38 

097211 0x34 0x34 0x30 0x41 0x41 0x31 0x35 0x31 0x31 0x37 0x31 0x38 0x30 0x38 0x39 0x30 

097229 0x30 0x30 0x38 0x34 0x30 0x31 0x38 0x30 0x32 0x32 0x39 0x31 0x30 0x31 0x38 0x32 

097248 0x36 0x33 0x31 0x33 0x30 0x41 0x32 0x32 0x30 0x38 0x30 0x42 0x38 0x31 0x31 0x30 

097266 0x34 0x30 0x33 0x30 0x39 0x38 0x31 0x34 0x46 0x37 0x36 0x31 0x36 0x32 0x33 0x31 

097285 0x33 0x32 0x42 0x30 0x41 0x31 0x42 0x33 0x41 0x41

GSM

097315 0x07 0x91 0x28 0x01 0x02 0x19 0x81 0x88 0x44 0x0A 0xA1 0x51 0x17 0x18 0x08 0x90 

097333 0x00 0x84 0x01 0x80 0x22 0x91 0x01 0x82 0x63 0x13 0x0A 0x22 0x08 0x0B 0x81 0x10 

097352 0x40 0x30 0x98 0x14 0xF7 0x61 0x62 0x31 0x32 0xB0 0xA1 0xB3 0xAA 0x37

해석: 

0x07

0x91

SERVICE CENTER: 0x28 0x01 0x02 0x19 0x81 0x88 

TP-UDHI:        0x44

ADDRESS:        0x0A 0xA1 0x51 0x17 0x18 0x08 0x90 

PROTOCOL ID:    0x00 

DCS:            0x84 

TIME STAMP:     0x01 0x80 0x22 0x91 0x01 0x82 0x63 

DATA LENGTH:    0x13 

HEADER LENGTH:  0x0A 0x22 0x08 0x0B 0x81 0x10 0x40 0x30 0x98 0x14 0xF7 

DATA:           0x61 0x62 0x31 0x32 0xB0 0xA1 0xB3 0xAA

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포인터이동 

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char msg[255] = {1,2};

char* pbWalk = msg;

UINT cchUserDataLength = *pbWalk++;

RETAILMSG(1,(_T("KSC5601: len: %d msg: 0x%x pbWalk: 0x%x\r\n"),cchUserDataLength,msg,pbWalk));

KSC5601: len: 1 msg: 0x218cf9fc pbWalk: 0x218cf9fd