C#调用VC动态库, VC正则表达式延时问题

今天在测试软件时发现使用纯VC软件刷新IO状态无明显延时， 但使用C#程序调用VC编写的动态库有较明显延时, 经测试发现出现延时的根本原因为： VS2015的VC动态库中使用C++11标准的正则表达式搜索数据算法， 使用替代方式后此问题解决。

使用C++标准库的正则表达式库， C#下调用时耗时为1至2秒（100个IO测试）， VC下调用的耗时30至100毫秒左右。

修改前

	string  recvTxt(recvBuf);
    regex   pattern(R"(\[\d+,\d+,\d+,\d+\])");
    cmatch  cm;

    struct {
        UINT ch;
        UINT diVal;
        UINT diInvertFlag;
        UINT doVal;
    } didoInfo;

    srcStr = recvBuf;
    while (regex_search(srcStr, cm, pattern)) {
        if (4 != sscanf_s(cm[0].str().c_str(), "[%d,%d,%d,%d]",
            &didoInfo.ch, &didoInfo.diVal, &didoInfo.diInvertFlag, &didoInfo.doVal)) {
            AddLogItem(ML_ERROR, 0, "接收DI DO状态[%s]格式错误!", cm.str().c_str());
        } else {
            int ch = didoInfo.ch;
            ASSERT(ch >= 0);

            if (s_DiStatus.size() <= ch) {
                s_DiStatus.resize(ch + 1);
                s_DoStatus.resize(ch + 1);

                s_DiStatus[ch].channel = ch;
                s_DoStatus[ch].channel = ch;
            }

            //DI状态
            s_DiStatus[ch].value = didoInfo.diVal == (UINT)ON ? ON : OFF;
            //DO状态
            s_DoStatus[ch].value = didoInfo.doVal == (UINT)ON ? ON : OFF;
        }
        srcStr = cm.suffix().first;
    }

修改后

	struct {
        UINT ch;
        UINT diVal;
        UINT diInvertFlag;
        UINT doVal;
    } didoInfo;

    srcStr = recvBuf;
    while (srcStr = strstr(srcStr, "[")) {
        if (4 != sscanf_s(srcStr, "[%d,%d,%d,%d]",
            &didoInfo.ch, &didoInfo.diVal, &didoInfo.diInvertFlag, &didoInfo.doVal)) {
            AddLogItem(ML_ERROR, 0, "接收DI DO状态[%s]格式错误!", srcStr);
        }
        else {
            int ch = didoInfo.ch;
            ASSERT(ch >= 0);

            if (s_DiStatus.size() <= ch) {
                s_DiStatus.resize(ch + 1);
                s_DoStatus.resize(ch + 1);

                s_DiStatus[ch].channel = ch;
                s_DoStatus[ch].channel = ch;
            }

            //DI状态
            s_DiStatus[ch].value = didoInfo.diVal == (UINT)ON ? ON : OFF;
            //DO状态
            s_DoStatus[ch].value = didoInfo.doVal == (UINT)ON ? ON : OFF;
        }
        srcStr = strstr(srcStr, "]");
    }