61 lines
2.0 KiB
C++
61 lines
2.0 KiB
C++
#include "networkspeed.h"
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NetworkSpeed::NetworkSpeed(QObject *parent) :QObject(parent)
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{
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qDebug()<<"debug: this is creator function of class NetworkSpeed";
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}
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int NetworkSpeed::getCurrentDownloadRates(char *netname, long *save_rate, long *tx_rate)
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{
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FILE * net_dev_file; //文件指针
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char buffer[1024]; //文件中的内容暂存在字符缓冲区里
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size_t bytes_read; //实际读取的内容大小
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char * match; //用以保存所匹配字符串及之后的内容
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int counter = 0;
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int i = 0;
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char tmp_value[128];
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if((NULL == netname)||(NULL == save_rate)||(NULL == tx_rate)){
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printf("bad param\n");
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return -1;
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}
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if ( (net_dev_file=fopen("/proc/net/dev", "r")) == NULL ){ //打开文件/pro/net/dev/，从中读取流量数据
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printf("open file /proc/net/dev/ error!\n");
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return -1;
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}
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memset(buffer,0,sizeof(buffer));
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while(fgets(buffer,sizeof(buffer),net_dev_file) != NULL){
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match = strstr(buffer,netname);
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if(NULL == match){
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//printf("no eth0 keyword to find!\n");
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continue;
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}else{
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//printf("%s\n",buffer);
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match = match + strlen(netname) + strlen(":"); //地址偏移到冒号
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sscanf(match,"%ld ",save_rate);
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memset(tmp_value,0,sizeof(tmp_value));
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sscanf(match,"%s ",tmp_value);
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match = match + strlen(tmp_value);
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for(i=0;i<strlen(buffer);i++){
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if(0x20 == *match){
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match ++;
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} else{
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if(8 == counter){
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sscanf(match,"%ld ",tx_rate);
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}
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memset(tmp_value,0,sizeof(tmp_value));
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sscanf(match,"%s ",tmp_value);
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match = match + strlen(tmp_value);
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counter ++;
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}
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}
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//printf("%s save_rate:%ld tx_rate:%ld\n",netname,*save_rate,*tx_rate);
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}
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}
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return 0; //返回成功
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}
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