发送一个反斜杠用C插座ISO8583消息

Question

我建立一个POS应用VeriFone公司（C语言），它应与来自摩洛哥M2M开关通信，但发送应该有这样(08\00)但反斜线初始化消息时，我被困当发送这个我有08\5c00。 它用十六进制（5c）中的值转换反斜杠。我正在使用的工具是套接字工作台来模拟服务器。 如何在不转换为\5c的情况下发送反斜杠？ 它需要用C语言完成。

编辑

这是我要发送到与头中的服务器上的数据，但尝试打印\00当我\5C00

sprintf(data,"%s%s%s%s%s%s%s%s%s%s%s%s%s","\x30\x60\x60\x20\x15\x35\x35","\x08",‌"\\00","\x0x00","\x01\x30\x30\x30\x30\xC0\x30\x30\x30\x30","\x97","\\00","\x30\x30"‌,"\x00\x00\x01\x00","\x02",idTerminal,idCommercant,"\x20\x20\x20\xA4\xBC"); 

Answer 1

如果我理解正确的话，第一部分你的例子：

sprintf(data,"%s%s", 
      "\x30\x60\x60\x20\x15\x35\x35", 
      "\x08"); 

正在做你想要的。问题是，在接下来的%s，你正在使用"\\00"，你想服务器接收ASCII \00（这将是0x5c，为0x30，的0x30），而是服务器报告它接收ASCII \5c00（这将是0x5c， 0x，35，0x43，0x30，0x30）。

我克拉斯Lindbäck同意的，因为它听起来像的VeriFone终端正在做正确的事情，但服务器显示是错误的。为了证明这是正确的（你可以只做一个或另一个，或者你可以一起做），我会考虑做两件事来排除这种情况。

第一条：您可以使用LOG_PRINTF（或者打印到纸张或屏幕上，如果你喜欢）打印每个字节的值，你把它关闭之前。下面是我写过的一个快速而肮脏的函数，当我对一次类似的问题进行故障排除时。请注意，我只关心字符串的开头（如你所见，似乎是这样），所以如果我用完了缓冲区空间，我不打印结尾。

void LogDump(unsigned char* input, int expectedLength) 
{ 
#ifdef LOGSYS_FLAG 
    char buffer[100]; 
    int idx, bfdx; 
    memset(buffer, 0, sizeof(buffer)); 

    bfdx = 0; 
    for (idx = 0; idx < expectedLength && bfdx < sizeof(buffer); idx++) 
    { 
     //if it is a printable character, print as is 
     if (input[idx] > 31 && input[idx] < 127) 
     { 
      buffer[bfdx++] = (char) input[idx]; 
      continue; 
     } 
     //if we are almost out of buffer space, show that we are truncating 
     // the results with a ~ character and break. Note we are leaving 5 bytes 
     // because we expand non-printable characters like "<121>" 
     if (bfdx + 5 > sizeof(buffer)) 
     { 
      buffer[bfdx++] = '~'; 
      break; 
     } 
     //if we make it here, then we have a non-printable character, so we'll show 
     // the value inside of "<>" to visually denote it is a numeric representation 
     sprintf(&buffer[bfdx], "<%d>", (int) input[idx]); 
     //advance bfdx to the next 0 in buffer. It will be at least 3... 
     bfdx += 3; 
     //... but for 2 and 3 digit numbers, it will be more. 
     while (buffer[bfdx] > 0) 
      bfdx++; 
    } 
    //I like to surround my LOG_PRINTF statements with short waits because if there 
    // is a crash in the program directly after this call, the LOG_PRINTF will not 
    // finish writing to the serial port and that can make it look like this LOG_PRINTF 
    // never executed which can make it look like the problem is elsewhere 
    SVC_WAIT(5); 
    LOG_PRINTF(("%s", buffer)); 
    SVC_WAIT(5); 
#endif 
} 

其次：尝试为char数组中的每个位置分配一个显式值。如果您已经使用了我的LOG_PRINTF建议，并且发现它并未发送您认为应该的内容，则这将是解决此问题的一种方法，以便它能够正确发送您想要的内容。这种方法比较繁琐一些，但因为你是拼写出来的每个值，无论如何，它应该不会太大更多的开销：

data[0] = 0x30; 
//actually, I'd probably use either the decimal value: data[0] = 48; 
// or I'd use the ASCII value: data[0] = '0'; 
// depending on what this data actually represents, either of those is 
// likely to be more clear to whomever has to read the code later. 
// However, that's your call to make. 
data[1] = 0x60; 
data[2] = 0x60; 
data[3] = 0x20; 
data[4] = 0x15; 
data[5] = 0x35; 
data[6] = 0x35; 
data[7] = 0x08; 
data[8] = 0x5C; // This is the '\' 
data[9] = 0x48; // The first '0' 
data[10]= 0x48; // The second '0' 
data[11]= 0; 
//for starters, you may want to stop here and see what you get on the other side 

后你已经证明自己，这IS或VeriFone代码不是导致问题，您将知道您是需要关注终端还是服务器端。