windows 从 RegQueryValueEx 获取正确的值
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Getting a proper value from RegQueryValueEx
提问by cftmon
I am trying to extract a value from the windows registry of type REG_SZ, using RegQueryValueEx, I got the value except it was riddled with strange "\000" before each letter.To show you what I mean here are some images:
我正在尝试从类型为 的 Windows 注册表中提取一个值REG_SZ，使用RegQueryValueEx，我得到了该值，只是在每个字母前都充满了奇怪的“\000”。为了向您展示我的意思，这里有一些图像：
Value I want(It is a device name of a wireless adapter)
我想要的值（它是无线适配器的设备名称）
Value I got:
我得到的价值：
here is the code:
这是代码：
HKEY hlistkey = NULL;
HKEY hkey = NULL;
int dwIndex=0;
string devName = returndevName(); //return current selected device name using iphlpapi.h
WCHAR KeyNameBuf[512];
DWORD keyNameSizBuf = 512;
char buffer[512];
RegOpenKeyEx(HKEY_LOCAL_MACHINE, TEXT("SYSTEM\CurrentControlSet\Control\Class\{4D36E972-E325-11CE-BFC1-08002bE10318}") ,0,KEY_READ, &hlistkey );
if(!hlistkey)
{
cout << "failed" << endl;
}
while(RegEnumKeyEx(hlistkey,dwIndex++,KeyNameBuf,&keyNameSizBuf,0,NULL,NULL,NULL) == ERROR_SUCCESS )
{
RegOpenKeyEx(hlistkey, KeyNameBuf, 0, KEY_READ | KEY_SET_VALUE, &hkey);
if(hkey)
{
keyNameSizBuf = 512;
if(RegQueryValueEx(hkey,TEXT("NetCfgInstanceId"), 0,NULL,(LPBYTE)buffer,&keyNameSizBuf ) == ERROR_SUCCESS )
{
if(strcmp(buffer,devName.c_str() ) ==0)
{
//set value here
}
}
RegCloseKey(hkey);
}
}
}
comparing bufferand devNamewould not be the same because of the extra null characters .If I cast buffer to a string I simply got a "{" which is the first value.I need to get the value of the devenamein the registry before I can change the "NetworkAddress" in the registry.
比较buffer并且devName由于额外的空字符而不会相同。如果我将缓冲区转换为字符串，我只会得到一个“{”，这是第一个值。devename我需要先获取注册表中的值，然后才能更改注册表中的“网络地址”。
回答by Loghorn
Since you are using WCHAR, I assume you are compiling with Unicode support. If this is true, then also the bufferneeds to be WCHAR.
由于您使用的是WCHAR，我假设您正在使用 Unicode 支持进行编译。如果这是真的，那么也buffer需要是WCHAR。
