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

[hai wang]

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,
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
> }

[hai wang]

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
>> }
>
>