我为我的应用程序编写了一个类。在此类中,有静态函数指针,用于通过网络套接字进行通信。在启动时,我将此函数指针分配给类之外的函数,并且可以正常工作而没有任何问题。现在我从类中创建了DLL,但是当我将此指针分配给函数时,出现“无法解析的外部符号”错误。我如何将类内的静态函数指针分配给类外的函数而没有任何问题?
这是我的课程:
(header,“ MyClass.h”)
#define IMPORT_DLL
#ifdef IMPORT_DLL
#define DLL_IMPORT_EXPORT __declspec(dllimport)
#else
#define DLL_IMPORT_EXPORT __declspec(dllexport)
#endif
namespace nmspace
{
class MyClass
{
//Constructors
DLL_IMPORT_EXPORT MyClass();
DLL_IMPORT_EXPORT MyClass(size_t ID);
//Destructor
DLL_IMPORT_EXPORT ~MyClass();
....
//This static function pointer should be assigned to a function outside of class
//this pointer used frequently
static bool(*Class_Transmit)(uint8_t* TX_buffer, size_t TX_size, size_t Port);
}
}
((源,“ MyClass.cpp”)]
#include "MyClass.h"
bool(*MyClass::Class_Transmit)(uint8_t* TX_buffer, size_t TX_size, size_t Port) = nullptr;
//Constructor
void MyClass::MyClass()
{
size_t Sock_num = 0
uint8_t TX_buffer[20] = "Transmit done";
bool is_connected = false;
is_connected = Class_Transmit(TX_buffer, 20, Sock_num);
}
(main,“ main.cpp”)
#include "MyClass.h"
bool MyFunc(uint8_t* TX_buffer, size_t TX_size, size_t Port)
{
....
return true;
}
int main()
{
HINSTANCE hinstLib;
hinstLib = LoadLibrary(TEXT("myclass.dll"));
// If the handle is valid, try to get the function address.
if (hinstLib != NULL)
return false;
//Assign network socket function for "Class_Transmit" class for communication
MyClass::Class_Transmit = MyFunc;
return 0;
}
错误表明该函数必须位于nmspace
命名空间中。尝试以下操作:
namespace nmspace
{
bool MyFunc(uint8_t* TX_buffer, size_t TX_size, size_t Port)
{
return true;
}
}