警告：format指定类型'unsigned int *'，但是参数具有类型'unsigned char *'[-Wformat]

Question

在Visual Studio 2017中编译C ++代码时，我得到以下输出信息：

main.cpp:139:34: warning: format specifies type 'unsigned int *' but the argument has type 'unsigned char *' [-Wformat]
                                sscanf(&item[2 * i], "%02X", &my1ch);
                                                      ~~~~   ^~~~~~
                                                      %2s
main.cpp:154:34: warning: format specifies type 'unsigned int *' but the argument has type 'unsigned char *' [-Wformat]
                                sscanf(&item[2 * i], "%02X", &my1ch);
                                                      ~~~~   ^~~~~~
                                                      %2s
main.cpp:168:34: warning: format specifies type 'unsigned int *' but the argument has type 'unsigned char *' [-Wformat]
                                sscanf(&item[2 * i], "%02X", &my1ch);
                                                      ~~~~   ^~~~~~
                                                      %2s
main.cpp:191:40: warning: flag '0' results in undefined behavior with 's' conversion specifier [-Wformat]
                printf("[ERROR] START/END IsGreater %064s \n", maxKey.GetBase16().c_str());
                                                    ~^~~~
main.cpp:275:26: warning: flag '0' results in undefined behavior with 's' conversion specifier [-Wformat]
                        printf("[load] start=%064s \n", bc->ksStart.GetBase16().c_str());
                                             ~^~~~
main.cpp:276:26: warning: flag '0' results in undefined behavior with 's' conversion specifier [-Wformat]
                        printf("[load]  next=%064s \n", bc->ksNext.GetBase16().c_str());
                                             ~^~~~
main.cpp:277:26: warning: flag '0' results in undefined behavior with 's' conversion specifier [-Wformat]
                        printf("[load]   end=%064s \n", bc->ksFinish.GetBase16().c_str());
                                             ~^~~~
main.cpp:394:30: warning: flag '0' results in undefined behavior with 's' conversion specifier [-Wformat]
  fprintf(f, "Priv (HEX): 0x%064s\n", pAddrHex.c_str());
                            ~^~~~
main.cpp:419:20: warning: ISO C++11 does not allow conversion from string literal to 'char *' [-Wwritable-strings]
  lambda.SetBase16("5363ad4cc05c30e0a5261c028812645a122e22ea20816678df02967c1b23bd72");
                   ^
main.cpp:420:21: warning: ISO C++11 does not allow conversion from string literal to 'char *' [-Wwritable-strings]
  lambda2.SetBase16("ac9c52b33fa3cf1f5ad9e3fd77ed9ba4a880b9fc8ec739c2e0cfc810b51283ce");
                    ^
main.cpp:572:20: warning: ISO C++11 does not allow conversion from string literal to 'char *' [-Wwritable-strings]
  maxKey.SetBase16("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364140");
                   ^
main.cpp:782:29: warning: flag '0' results in undefined behavior with 's' conversion specifier [-Wformat]
  printf("[keyspace] start=%064s\n", bc->ksStart.GetBase16().c_str());
                           ~^~~~
main.cpp:783:29: warning: flag '0' results in undefined behavior with 's' conversion specifier [-Wformat]
  printf("[keyspace]   end=%064s\n", bc->ksFinish.GetBase16().c_str());

那它看起来应该怎么样？

到文件内容的链接在这里：https://github.com/JeanLucPons/VanitySearch/blob/master/main.cpp

Answer 1

来自sscanf(3)

  

转化

     

以下类型修饰符可以出现在转换中   规格：

     

h

     

表示转换将是d，i，o，   u，x，X或n，下一个指针是短整数或   unsigned short int（而不是int）。

     

hh

     

与h相同，但下一个指针是指向带符号的char或   未签名的字符。

     

...

=>如果要"%02hhX"变成"%02X"，则需要sscanf而不是unsigned char。