Map of API name and value pair..?

Question

I want to create a map of apiname and value pair..please help... i want record value...like if apiname of opportunity field is name..then i want record value..ie opportunity name...

for eg

Map<String, Schema.SObjectField> fieldMap = leadSchema.getDescribe().fields.getMap();
Opportunity opp=[Select id,name,accountId from Opportunity];
 Map<String,string> valueMap=new Map<String,String>();

    for(opportunity o:opp)
           {
                for(String fieldName: fieldMap.keySet())
                {
                    **valueMap.put(fieldName,o);**
                }

           }

Answer 1

OK, having re-read the question...

You can use get with the fieldname on the sObject, e.g.

Opportunity opp=[Select id,name,accountId from Opportunity limit 1];
System.debug(opp.get('name'));

So in your example I think you want

valueMap.put(fieldName, o.get(fieldName));

Answer 2

You can do something like this

Map<String, Schema.SObjectField> fieldMap = leadSchema.getDescribe().fields.getMap();
Opportunity opp = [Select id,name,accountId from Opportunity];
Map<String,String> valueMap = new Map<String,String>();

for ( Opportunity o : opp ) {
    for ( String fieldName : fieldMap.keySet() ) {
        valueMap.put(fieldName, o.get(fieldName));
    }
}

Answer 3

I see that you have already accepted an answer, but I think there is a flaw in your example code, if you have more than one opportunity in the opp list your will end up with only key/value pairs in the valueMap of the last opportunity in the list.

For example if you have 2 opportunities {opp1(Name="Greg"), opp2(Name="Tom")} in the list, your Map will look like {Name=>"Tom"}

Another point is that Apex SObjects already have Map methods for accessing the values on the object. I refer to the SObject Methods Documentation. There are get and put methods that would accomplish everything your key value Map does. Both other answers are using these methods to populate the valueMap