[求助]如何在ＶＣ中调用DLL

muzi

这有一个例子，能帮我写出来吗？（不用MFC）
dll路径：C:\web.dll
有一个函数：int _stdcall connect(HTTP_CONNECTION **connection, const char *host, short port, const char *username, const char *password)
其中HTTP_CONNECTION 是一个结构体，定义如下
struct http_connection {
SOCKET socketd;
int status;
char *host;
struct sockaddr_in address;
int persistent;
HTTP_AUTH_INFO *auth_info;
};
（其它定义略）
问题：我怎么调用这个函数？比如在head.h 中如何声明，head.cpp中如何使用？
静态如何？
动态如何？
谢谢！
声明：
#define DllImport _declspec(dllimport)

typedef struct http_connection      HTTP_CONNECTION;
typedef struct http_auth_parameter  HTTP_AUTH_PARAMETER;
typedef struct http_auth_info       HTTP_AUTH_INFO;

struct http_connection {
SOCKET socketd;
int status;
char *host;
struct sockaddr_in address;
int persistent;
HTTP_AUTH_INFO *auth_info;
};

struct http_auth_parameter {
char *name;
char *value;
HTTP_AUTH_PARAMETER *next_parameter;
HTTP_AUTH_PARAMETER *prev_parameter;
};

struct http_auth_info {
char *method;
int count;
HTTP_AUTH_PARAMETER *first_parameter;
HTTP_AUTH_PARAMETER *last_parameter;
};

extern "C" int _stdcall dav_init(void);

extern "C" int _stdcall dav_connect(HTTP_CONNECTION **connection, const char *host, short port, const char *username, const char *password);
调用：
HTTP_CONNECTION *connection = NULL;
connection = (HTTP_CONNECTION *) malloc(sizeof(HTTP_CONNECTION));
typedef int(proc1)(HTTP_CONNECTION **connection, const char *host, short port, const char *username, const char *password);

proc1* pFunc1;
HINSTANCE hInstance;
hInstance=:oadLibrary("C:\\ploting\\webdav.dll");
if(hInstance==NULL)
{
        acutPrintf("\n can not fine dll file.");
}
        pFunc1=(proc1*)::GetProcAddress(hInstance,"dav_connect");
int test=(*pFunc1)(&connection,(char *)"192.168.0.22",8080,(char *)"maf",(char *)"maf");
acutPrintf("\n test is %d",test);
编译错误：
Run-Time Check Failure #0 - The value of ESP was not properly saved across a function call.  This is usually a result of calling a function declared with one calling convention with a function pointer declared with a different calling convention.

是为什么？