C#調用VC動態庫, VC正則表達式延時問題

今天在測試軟件時發現使用純VC軟件刷新IO狀態無明顯延時， 但使用C#程序調用VC編寫的動態庫有較明顯延時, 經測試發現出現延時的根本原因爲： VS2015的VC動態庫中使用C++11標準的正則表達式搜索數據算法， 使用替代方式後此問題解決。

使用C++標準庫的正則表達式庫， C#下調用時耗時爲1至2秒（100個IO測試）， VC下調用的耗時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狀態[%s]格式錯誤!", 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狀態
            s_DiStatus[ch].value = didoInfo.diVal == (UINT)ON ? ON : OFF;
            //DO狀態
            s_DoStatus[ch].value = didoInfo.doVal == (UINT)ON ? ON : OFF;
        }
        srcStr = cm.suffix().first;
    }

修改後

	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狀態[%s]格式錯誤!", 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狀態
            s_DiStatus[ch].value = didoInfo.diVal == (UINT)ON ? ON : OFF;
            //DO狀態
            s_DoStatus[ch].value = didoInfo.doVal == (UINT)ON ? ON : OFF;
        }
        srcStr = strstr(srcStr, "]");
    }