用C++写的CGI程序 - 编程入门网
作者 佚名技术
来源 NET编程
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发布时间 2012-06-25
| t; #include <vector> // STL vector using namespace std; // A class to hold a single name-value pair from // a CGI query. CGI_vector holds Pair objects and // returns them from its operator[]. class Pair { char* nm; char* val; public: Pair() { nm = val = 0; } Pair(char* name, char* value) { // Creates new memory: nm = decodeURLString(name); val = decodeURLString(value); } const char* name() const { return nm; } const char* value() const { return val; } // Test for "emptiness" bool empty() const { return (nm == 0) || (val == 0); } // Automatic type conversion for boolean test: operator bool() const { return (nm != 0) && (val != 0); } // The following constructors & destructor are // necessary for bookkeeping in C++. // Copy-constructor: Pair(const Pair& p) { if(p.nm == 0 || p.val == 0) { nm = val = 0; } else { // Create storage & copy rhs values: nm = new char[strlen(p.nm) + 1]; strcpy(nm, p.nm); val = new char[strlen(p.val) + 1]; strcpy(val, p.val); } } // Assignment operator: Pair& operator=(const Pair& p) { // Clean up old lvalues: delete nm; delete val; if(p.nm == 0 || p.val == 0) { nm = val = 0; } else { // Create storage & copy rhs values: nm = new char[strlen(p.nm) + 1]; strcpy(nm, p.nm); val = new char[strlen(p.val) + 1]; strcpy(val, p.val); } return *this; } ~Pair() { // Destructor delete nm; // 0 value OK delete val; } // If you use this method outide this class, // you''re responsible for calling ''delete'' on // the pointer that''s returned: static char* decodeURLString(const char* URLstr) { int len = strlen(URLstr); char* result = new char[len + 1]; memset(result, len + 1, 0); for(int i = 0, j = 0; i <= len; i++, j++) { if(URLstr[i] == ''+'') result[j] = '' ''; else if(URLstr[i] == ''%'') { result[j] = translateHex(URLstr[i + 1]) * 16 + translateHex(URLstr[i + 2]); i += 2; // Move past hex code } else // An ordinary character result[j] = URLstr[i]; } return result; } // Translate a single hex character; used by // decodeURLString(): static char translateHex(char hex) { if(hex >= ''A'') return (hex & 0xdf) - ''A'' + 10; else return hex - ''0''; } }; // Parses any CGI query and turns it // into an STL vector of Pair objects: class CGI_vector : public vector<Pair> { char* qry; const char* start; // Save starting position // Prevent assignment and copy-construction: void operator=(CGI_vector&); CGI_vector(CGI_vector&); public: // const fields must be initialized in the C++ // "Constructor initializer list": CGI_vector(char* query) : start(new char[strlen(query) + 1]) { qry = (char*)start; // Cast to non-const s |
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