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() { // 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));}

下载地址：http://download.csdn.net/source/3040966