难道真的没人会么？我出100分，多谢了！！！

Question

SQLHANDLE hEnv;
SQLRETURN sr = SQLAllocHandle(SQL_HANDLE_ENV,
                        SQL_NULL_HANDLE,
                       &hEnv);sr = SQLDataSources(hEnv,
           SQL_FETCH_FIRST_USER,
           servername,
            50,
           &serlength,
           description,
            100,
           &deslength);

Answer 1

下面的page有SQLDataSources的用法
http://download.lycos.com.cn/program/article/vc/vc419.html

Answer 2

摘自MSDNHENV hEnv;
char szDSN[30];
SWORD cbDSN;
UCHAR szDescription[300];
SWORD cbDescription;
RETCODE retcode;if (SQLAllocEnv(&hEnv)!=SQL_SUCCESS) return FALSE;
while (retcode=SQLDataSources(hEnv, SQL_FETCH_NEXT,(UCHAR FAR *) &szDSN, MAX_DSN_LENGTH, &cbDSN,(UCHAR FAR *) &szDescription,
MAX_DSN_DESC_LENGTH,&cbDescription) != SQL_NO_DATA_FOUND&&retcode!=SQL_ERROR){增加(szDSN);}
SQLFreeEnv(hEnv);
if (retcode==SQL_ERROR) return FALSE;

Answer 3

#define MAX_DSN_LENGTH 30
#define MAX_DSN_DESC_LENGTH 300