C语言实现修改IE浏览器的代理设置

写了一个用C语言实现修改IE浏览器代理设置的例子：

/* 
 * Proxy.c 
 * 
 *  Created on: 2010-11-23 
 *      Author: Jackie 
 */  
  
#include <stdio.h>  
#include <windows.h>  
#include <conio.h>  
  
#define PROXY_REG_ITEM "Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings"  
  
// global variables  
char g_szProxyServ[256] = {0};  
  
void Usage()  
{  
printf("作者:Jackie\n");  
printf("IE代理设置程序！");  
}  
  
//  
// Set IE Proxy  
//  
// HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings  
// ProxyEnable:  
//            0            proxy is disable  
//            1            proxy enable.  
BOOL SetProxy(BOOL bEnabled)  
{  
HKEY hKey = NULL;  
  
LONG lret = RegOpenKeyEx(HKEY_CURRENT_USER,  
           PROXY_REG_ITEM,  
           NULL,  
           KEY_WRITE |  
           KEY_SET_VALUE,  
           &hKey);  
if(hKey == NULL || lret != ERROR_SUCCESS)  
{  
           return FALSE;  
}  
  
// enable or disable  
if(bEnabled)  
{  
           lret = RegSetValueEx(hKey,  
            "ProxyServer",  
            NULL,  
            REG_SZ,  
            (BYTE*)g_szProxyServ,  
            sizeof(g_szProxyServ));  
  
           DWORD dwenable = 1;  
           lret = RegSetValueEx(hKey,  
            "ProxyEnable",  
            NULL,  
            REG_DWORD,  
            (LPBYTE) & dwenable,  
            sizeof(dwenable));  
}  
else  
{  
           DWORD dwenable = 0;  
           lret = RegSetValueEx(hKey,  
            "ProxyEnable",  
            NULL,  
            REG_DWORD,  
            (LPBYTE) & dwenable,  
            sizeof(dwenable));  
}  
RegCloseKey(hKey);  
  
return TRUE;  
}  
  
int main(int argc, char *argv[])  
{  
Usage();  
char ch;  
printf("\n请选择是否将IE设置成代理模式(y/n)：");  
scanf("%s",&ch);  
  
char str[]="xxx.xxx.xxx.xxx:8080";     //Proxy server  
// enable  
if (ch=='y' || ch=='Y')  
{  
    strncpy(g_szProxyServ, str, sizeof(g_szProxyServ));  
    if(SetProxy(TRUE))  
    {  
        printf("Enable IE Proxy Successful.\n");  
    }  
    else  
    {  
        printf("Enable IE Proxy Failed.\n");  
    }  
}  
// disable  
else if(ch=='n' || ch=='N')  
{  
    if(SetProxy(FALSE))  
    {  
        printf("Disable IE Proxy Successful.\n");  
    }  
    else  
    {  
        printf("Disable IE Proxy Failed.\n");  
    }  
}  
else{  
    printf("选择的不正确，请重新选择！\n");  
}  
printf("请按任意键退出！");  
getch();  
return 0;  
}