网络流量监控（局域网）

叁歲伎倆 2022-09-29 04:18 249阅读 0赞

一个轻量级的网络流量监控程序，只能在局域网中使用。

主要用到GetIfTable()，和GetIfEntry() 两个API。界面用QT做，可以隐藏在系统托盘中。

截图

![0_1298481982k17r.gif][]

核心代码如下

void NetFlow::getFlow() \{ // 记录上一次函数调用时的总流量和时间，在后面计算流量速度的时候用到 preInFlow = inFlow; preOutFlow = outFlow; preTime = currTime; inFlow = 0.0f; outFlow = 0.0f; currTime = GetTickCount(); int i; pIfTable = (MIB\_IFTABLE \*) MALLOC(sizeof (MIB\_IFTABLE)); if (pIfTable == NULL) \{ printf("Error allocating memory needed to call GetIfTable/n"); return; \} dwSize = sizeof (MIB\_IFTABLE); if (GetIfTable(pIfTable, &dwSize, 0) == ERROR\_INSUFFICIENT\_BUFFER) \{ FREE(pIfTable); pIfTable = (MIB\_IFTABLE \*) MALLOC(dwSize); if (pIfTable == NULL) \{ printf("Error allocating memory/n"); return; \} \} if ((dwRetVal = GetIfTable(pIfTable, &dwSize, 0)) == NO\_ERROR) \{ if (pIfTable->dwNumEntries > 0) \{ pIfRow = (MIB\_IFROW \*) MALLOC(sizeof (MIB\_IFROW)); if (pIfRow == NULL) \{ printf("Error allocating memory/n"); if (pIfTable != NULL) \{ FREE(pIfTable); pIfTable = NULL; \} return; \} printf("/tNum Entries: %ld/n/n", pIfTable->dwNumEntries); // 枚举所有接口 for (i = 0; i < (int) pIfTable->dwNumEntries; i++) \{ pIfRow->dwIndex = pIfTable->table\[i\].dwIndex; if ((dwRetVal = GetIfEntry(pIfRow)) == NO\_ERROR) \{ // 排除环回接口的流量 if(pIfRow->dwType != MIB\_IF\_TYPE\_LOOPBACK) \{ inFlow += pIfRow->dwInOctets; outFlow += pIfRow->dwOutOctets; \} \} else \{ printf("GetIfEntry failed for index %d with error: %ld/n", i, dwRetVal); \} \} \} else \{ printf("/tGetIfTable failed with error: %ld/n", dwRetVal); \} \} FREE(pIfTable); FREE(pIfRow); // 计算流量，速度=总流量 / 所经过的时间 float inSpeed = (inFlow - preInFlow) / ((float)(currTime - preTime) / 1000.0f); float outSpeed = (outFlow - preOutFlow) / ((float)(currTime - preTime) / 1000.0f); char buffer\[100\]; sprintf(buffer, "Download: %.2fk/s Upload: %.2fk/s", inSpeed / 1000.0f, outSpeed / 1000.0f); bodyEdit->setText(buffer); trayIcon->setToolTip(QString(buffer)); \}

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