std::map 如何使用GUID

以下是使用std::map存储和使用GUID的示例代码：

#include <iostream>
#include <map>
#include <string>
#include <algorithm>

// GUID结构体
struct GUID {
    int data1;
    short data2;
    short data3;
    char data4[8];
};

// 重载小于运算符，用于在std::map中排序
bool operator<(const GUID& lhs, const GUID& rhs) {
    if (lhs.data1 != rhs.data1) {
        return lhs.data1 < rhs.data1;
    }
    if (lhs.data2 != rhs.data2) {
        return lhs.data2 < rhs.data2;
    }
    if (lhs.data3 != rhs.data3) {
        return lhs.data3 < rhs.data3;
    }
    return std::lexicographical_compare(lhs.data4, lhs.data4 + 8, rhs.data4, rhs.data4 + 8);
}

// 将GUID转换为字符串
std::string GuidToString(const GUID& guid) {
    char buf[40];
    sprintf_s(buf, "{%08X-%04X-%04X-%02X%02X-%02X%02X%02X%02X%02X%02X}",
        guid.data1, guid.data2, guid.data3,
        guid.data4[0], guid.data4[1], guid.data4[2], guid.data4[3],
        guid.data4[4], guid.data4[5], guid.data4[6], guid.data4[7]);
    return buf;
}

// 在std::map中查找GUID
std::map<GUID, std::string>::iterator FindGuid(std::map<GUID, std::string>& guidMap, const GUID& guid) {
    return std::find_if(guidMap.begin(), guidMap.end(), [&](const std::pair<GUID, std::string>& pair) {
        return memcmp(&pair.first, &guid, sizeof(GUID)) == 0;
    });
}

int main() {
    // 创建一个std::map，用于存储GUID和对应的字符串
    std::map<GUID, std::string> guidMap;

    // 添加一些GUID和字符串
    GUID guid1 = { 0x12345678, 0x9ABC, 0xDEF0, {0x12, 0x34, 0x56, 0x78, 0x9A, 0xBC, 0xDE, 0xF0} };
    guidMap[guid1] = "GUID 1";
    GUID guid2 = { 0x87654321, 0xCDEF, 0x0FED, {0x21, 0x43, 0x65, 0x87, 0x09, 0x8B, 0xAD, 0xCF} };
    guidMap[guid2] = "GUID 2";

    // 在std::map中查找GUID
    GUID guid3 = { 0x12345678, 0x9ABC, 0xDEF0, {0x12, 0x34, 0x56, 0x78, 0x9A, 0xBC, 0xDE, 0xF0} };
    auto iter = FindGuid(guidMap, guid3);
    if (iter != guidMap.end()) {
        std::cout << "Found GUID: " << GuidToString(iter->first) << ", value: " << iter->second << std::endl;
    } else {
        std::cout << "GUID not found" << std::endl;
    }

    return 0;
}