Hi. I try compile "hello,world" program for BOINC project on my server. I use Windows 7 x64 Ultimate, Visual Studio 2011 Developer Preview.
Source code:
#include <stdio.h>
#include <conio.h>
#include <boinc_api.h>
#include <boinc_win.h>

int main()
{
boinc_init();
printf("Hello, World!\n");
boinc_finish(1);
return 0;
}
Output:
1>------ Build started: Project: Hello, World!, Configuration: Debug Win32 ------
1>Hello, World.obj : error LNK2019: unresolved external symbol _boinc_init referenced in function _main
1>Hello, World.obj : error LNK2019: unresolved external symbol _boinc_finish referenced in function _main
1>D:\TOP\Grid\Apps\Hello, World!\Debug\Hello, World!.exe : fatal error LNK1120: 2 unresolved externals
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

You must link the boinc api and boinc lib together with your object file.
yoyo

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