Question

所以我试图检查字符串是否在内存的“块”内。所以这里是一个组成的内存地址0x00343211，我开始并希望从中开始检查。

我要做的是将数据从0x00343211写入0x00343211 + 900到char数组中，然后检查该char数组中是否有我正在寻找的字符串。

所以这就是我已经尝试过的

char dataBuf[1000] = { 0 };
memcpy((void*)dataBuf,(void*)0x00343211,900);
if(strstr(dataBuf,"ACTIVE") != NULL)
{
    //I want to check if the string "ACTIVE" is
    //within the random data that I have written into dataBuf
}

但这似乎没有用。

Answer 1

您可以直接在内存块上使用std::search，并祈祷您的编译器具有高效的实现，如下所示：

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


int main()
{
    char dataBuf[13] = { "xxxACTIVExxx" }; // block of 12 bytes + zero byte
    std::string active = "ACTIVE";

    using std::begin;
    using std::end;

    // std::search returns dataBuf+12 if no match is found
    if (std::search(dataBuf, dataBuf + 12,
        begin(active), end(active))
        != dataBuf + 12)
    {
        std::cout << "ACTIVE has been found\n";
    }
    else {
        std::cout << "ACTIVE has not been found\n";
    }


    return 0;
}

C ++检查数据是否已指定字符串

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