linker error while calling a c function from VC++ application

[hai wang]

Hello Jonathan,
I made a mistake, in fact, the libxml is housed in the LIB rather than
DLL.
Cheers!
Hai wang
"hai wang" <hwang@accuris.ie> wrote:
>
>Hello Jonathan,
> The libxml is housed in the DLL, I tried to call several other functions
>in the library, no one works, so I guess my library setting has some problems,
>but where?
>
>Thank you very much!
>Hai wang
>"Jonathan Morrison" <jonathanm@mindspring.com> wrote:
>>Hai,
>>The linker error you are getting means that the linker is looking for a
>>function written in C named xmlParseFile. The reason that the error message
>>says _xmlParseFile is because the compiler mangles the name of C functions
>>this way. Where is the libxml library housed (a DLL or LIB).
>>
>>-Jonathan
>>"hai wang" <hwang@accuris.ie> wrote in message
>>news:3a1436ca$1@news.devx.com...
>>>
>>> Hello everybody,
>>> Now I am working with a xml c libray called libxml, I have compiled
>>> the library by using VC++ 6, and then I wrote my own application which
>is
>>> calling the xml c library functions, I can compile the application without
>>> any error, but I couldn't create an executable file because a linker
error
>>> "error LNK2001: unresolved external symbol _xmlParseFile", I guess the
>>problem
>>> may result from VC++ settings which make VC++ co-work with c source code,
>>> but I don't know how to fix the problem, if any of you has the experience
>>> or solution, could you please reply me, I really appreciate it.
>>>
>>> Thank you very much!
>>>
>>> Hai Wang
>>>
>>>
>>> The source codes are given which caused the problem:
>>>
>>> char* filename = "Wang"; // substitute it with the file name
>>>
>>> FILE* f =fopen(filename, "w");
>>> f=fopen(filename, "w");
>>> int res, size = 1024;
>>> char chars[1024];
>>> res = fread(chars,1, 1024, f);
>>>
>>> SYSTEMTIME sysTime;
>>> COleDateTime timeNow = COleDateTime::GetCurrentTime();
>>>
>>>
>>> WORD W_starttime, W_endtime = 0;
>>>
>>> if(!timeNow.GetAsSystemTime(sysTime))
>>> {
>>> // cout << "time format conversion is failed " << endl;
>>> exit(1);
>>> }
>>>
>>> W_starttime = sysTime.wMilliseconds;
>>>
>>> xmlDocPtr xml_xmlDocPtr;
>>>
>>>
>>> for(int iterator1 = 0; iterator1 < 1000; iterator1++)
>>> {
>>> xml_xmlDocPtr = xmlParseMemory(chars, res); // attention! the
>>function
>>> call caused this problem
>>> }
>>
>>
>

[Jonathan Morrison]

Hai,
Then all you need to do is be sure and add the lib file to the project. In
VC++ you Project->Add To Project->Files from the Project menu. Then you
should be good to go!

Thanks,
Jonathan

"hai wang" <hwang@accuris.ie> wrote:
>
>Hello Jonathan,
> I made a mistake, in fact, the libxml is housed in the LIB rather than
>DLL.
>Cheers!
>Hai wang
>"hai wang" <hwang@accuris.ie> wrote:
>>
>>Hello Jonathan,
>> The libxml is housed in the DLL, I tried to call several other functions
>>in the library, no one works, so I guess my library setting has some problems,
>>but where?
>>
>>Thank you very much!
>>Hai wang
>>"Jonathan Morrison" <jonathanm@mindspring.com> wrote:
>>>Hai,
>>>The linker error you are getting means that the linker is looking for
a
>>>function written in C named xmlParseFile. The reason that the error message
>>>says _xmlParseFile is because the compiler mangles the name of C functions
>>>this way. Where is the libxml library housed (a DLL or LIB).
>>>
>>>-Jonathan
>>>"hai wang" <hwang@accuris.ie> wrote in message
>>>news:3a1436ca$1@news.devx.com...
>>>>
>>>> Hello everybody,
>>>> Now I am working with a xml c libray called libxml, I have compiled
>>>> the library by using VC++ 6, and then I wrote my own application which
>>is
>>>> calling the xml c library functions, I can compile the application without
>>>> any error, but I couldn't create an executable file because a linker
>error
>>>> "error LNK2001: unresolved external symbol _xmlParseFile", I guess the
>>>problem
>>>> may result from VC++ settings which make VC++ co-work with c source
code,
>>>> but I don't know how to fix the problem, if any of you has the experience
>>>> or solution, could you please reply me, I really appreciate it.
>>>>
>>>> Thank you very much!
>>>>
>>>> Hai Wang
>>>>
>>>>
>>>> The source codes are given which caused the problem:
>>>>
>>>> char* filename = "Wang"; // substitute it with the file name
>>>>
>>>> FILE* f =fopen(filename, "w");
>>>> f=fopen(filename, "w");
>>>> int res, size = 1024;
>>>> char chars[1024];
>>>> res = fread(chars,1, 1024, f);
>>>>
>>>> SYSTEMTIME sysTime;
>>>> COleDateTime timeNow = COleDateTime::GetCurrentTime();
>>>>
>>>>
>>>> WORD W_starttime, W_endtime = 0;
>>>>
>>>> if(!timeNow.GetAsSystemTime(sysTime))
>>>> {
>>>> // cout << "time format conversion is failed " << endl;
>>>> exit(1);
>>>> }
>>>>
>>>> W_starttime = sysTime.wMilliseconds;
>>>>
>>>> xmlDocPtr xml_xmlDocPtr;
>>>>
>>>>
>>>> for(int iterator1 = 0; iterator1 < 1000; iterator1++)
>>>> {
>>>> xml_xmlDocPtr = xmlParseMemory(chars, res); // attention! the
>>>function
>>>> call caused this problem
>>>> }
>>>
>>>
>>
>