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Windows下 C++网络延时检测 - C/C++ - 清泛网 - 专注C/C++及内核技术

... #define PING_TIMES 2 //ping 4 次 typedef struct _IPINFO { unsigned char Ttl; // Time To Live unsigned char Tos; // Type Of Service unsigned char IPFlags; // IP flags unsigned char OptSize; // Size of options data unsigned char FAR *Options; // Options data buffer }IPINFO;...
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Delete element in a slice

...d a slice while it is in range, it will induce some problem. Old Answer: chars := []string{"a", "a", "b"} for i, v := range chars { fmt.Printf("%+v, %d, %s\n", chars, i, v) if v == "a" { chars = append(chars[:i], chars[i+1:]...) } } fmt.Printf("%+v", chars) Expected : [a a ...
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std::string formatting like sprintf

...'ll have to do it first in a c-string, then copy it into a std::string: char buff[100]; snprintf(buff, sizeof(buff), "%s", "Hello"); std::string buffAsStdStr = buff; But I'm not sure why you wouldn't just use a string stream? I'm assuming you have specific reasons to not just do this: st...
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Variable number of arguments in C++?

...example (see it live): void func(T, Args...) [T = int, Args = <double, char, std::basic_string<char>>]: 1 void func(T, Args...) [T = double, Args = <char, std::basic_string<char>>]: 2.5 void func(T, Args...) [T = char, Args = <std::basic_string<char>>]: a void fu...
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Given an emacs command name, how would you find key-bindings ? (and vice versa)

...d bound to a keyboard shortcut (or a key sequence in Emacs terms), see the selected answer. For programmatically getting the command bound to a given key sequence, use the function key-binding or lookup-key that takes a key sequence and returns its bound command. The function key-binding is what C-...
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How can I check if a single character appears in a string?

... You can use string.indexOf('a'). If the char a is present in string : it returns the the index of the first occurrence of the character in the character sequence represented by this object, or -1 if the character does not occur. ...
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Lazy Method for Reading Big File in Python?

... assert len(list(rows(f, chunksize=chunksize))) == 1 @cleanup def test_1_char_2_rows(chunksize=1024): with open(test_file, 'w') as f: f.write('|') with open(test_file) as f: assert len(list(rows(f, chunksize=chunksize))) == 2 @cleanup def test_1_char(chunksize=1024): w...
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Is the sizeof(some pointer) always equal to four?

For example: sizeof(char*) returns 4. As does int* , long long* , everything that I've tried. Are there any exceptions to this? ...
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字符串指针变量与字符数组的区别 - C/C++ - 清泛网 - 专注C/C++及内核技术

... 设有定义字符型指针变量与字符数组的语句如下:  char *pc ,str[100];  则系统...使用字符串指针变量与字符数组的区别 (1)分配内存   设有定义字符型指针变量与字符数组的语句如下:   char *pc ,str[100];   则系...
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SQL server query to get the list of columns in a table along with Data types, NOT NULL, and PRIMARY

...licate rows for some columns, use user_type_id instead of system_type_id. SELECT c.name 'Column Name', t.Name 'Data type', c.max_length 'Max Length', c.precision , c.scale , c.is_nullable, ISNULL(i.is_primary_key, 0) 'Primary Key' FROM sys.columns c INNER JOIN ...