网络流量监控（局域网）

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

核心代码如下

void NetFlow::getFlow() {<br /> // 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<br /> preInFlow = inFlow;<br /> preOutFlow = outFlow;<br /> preTime = currTime;<br /> inFlow = 0.0f;<br /> outFlow = 0.0f;<br /> currTime = GetTickCount();<br /> int i;<br /> pIfTable = (MIB_IFTABLE *) MALLOC(sizeof (MIB_IFTABLE));<br /> if (pIfTable == NULL) {<br /> printf("Error allocating memory needed to call GetIfTable/n");<br /> return;<br /> }<br /> dwSize = sizeof (MIB_IFTABLE);<br /> if (GetIfTable(pIfTable, &dwSize, 0) == ERROR_INSUFFICIENT_BUFFER) {<br /> FREE(pIfTable);<br /> pIfTable = (MIB_IFTABLE *) MALLOC(dwSize);<br /> if (pIfTable == NULL) {<br /> printf("Error allocating memory/n");<br /> return;<br /> }<br /> }<br /> if ((dwRetVal = GetIfTable(pIfTable, &dwSize, 0)) == NO_ERROR) {<br /> if (pIfTable->dwNumEntries > 0) {<br /> pIfRow = (MIB_IFROW *) MALLOC(sizeof (MIB_IFROW));<br /> if (pIfRow == NULL) {<br /> printf("Error allocating memory/n");<br /> if (pIfTable != NULL) {<br /> FREE(pIfTable);<br /> pIfTable = NULL;<br /> }<br /> return;<br /> }<br /> printf("/tNum Entries: %ld/n/n", pIfTable->dwNumEntries);<br /> // 枚举所有接口<br /> for (i = 0; i < (int) pIfTable->dwNumEntries; i++) {<br /> pIfRow->dwIndex = pIfTable->table[i].dwIndex;<br /> if ((dwRetVal = GetIfEntry(pIfRow)) == NO_ERROR) {<br /> // 排除环回接口的流量<br /> if(pIfRow->dwType != MIB_IF_TYPE_LOOPBACK) {<br /> inFlow += pIfRow->dwInOctets;<br /> outFlow += pIfRow->dwOutOctets;<br /> }<br /> }<br /> else {<br /> printf("GetIfEntry failed for index %d with error: %ld/n",<br /> i, dwRetVal);<br /> }<br /> }<br /> } else {<br /> printf("/tGetIfTable failed with error: %ld/n", dwRetVal);<br /> }<br /> }<br /> FREE(pIfTable);<br /> FREE(pIfRow);<br /> // 计算流量，速度=总流量 / 所经过的时间<br /> float inSpeed = (inFlow - preInFlow) / ((float)(currTime - preTime) / 1000.0f);<br /> float outSpeed = (outFlow - preOutFlow) / ((float)(currTime - preTime) / 1000.0f);<br /> char buffer[100];<br /> sprintf(buffer, "Download: %.2fk/s Upload: %.2fk/s", inSpeed / 1000.0f, outSpeed / 1000.0f);<br /> bodyEdit->setText(buffer);<br /> trayIcon->setToolTip(QString(buffer));<br /> }

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原文链接：网络流量监控（局域网），转载请注明来源！