如何在 C 中创建用于使用 C++ 代码的包装器?

我正在尝试为C++第三方库做一个 C 包装器，因为我需要在 C 项目中使用它。 我见过C++类包装器的示例，但我没有理解该过程，也无法包装C++结构。

我想包装的结构：

struct confGlobal{
long int device;
string name;
int number;
string uid;
string message;
bool mode;
confiGlobal():device{LONG_MAX}, number{INT_MAX}{}
};
struct product{
string id;
string name;
};
struct category{
unsigned char id;
string name;
string description;
category():id{UCHAR_MAX}{}
};
struct subCategory{
unsigned char id;
string name;
string description;
unsigned char idRoot;
subCategory():id{UCHAR_MAX}, idRoot{UCHAR_MAX}{}
};
struct confPartner{
vector<struct product> tableProduct;
vector<struct category> tableCategory;
vector<struct subCategory> tableSubCategory;
};

对于对此方法的调用：

class my_API {
public:
static my_API* Instance(struct confGlobal cGlobal,
struct confPartner cPartner);
... another methods ...
private:
virtual ~my_API();
struct confGlobal cGlobal;
struct confPertner cPartner;
};

我需要填写这个结构并从 C 调用my_API::Instance()，但我的尝试没有成功。

包装器.h

#ifdef __cplusplus
extern "C" {
#endif
struct confGlobal_wpr; // An opaque type that we'll use as a handle
typedef struct confGlobal_wpr confGlobal_wpr;
confGlobal_wpr *confGlobal_create(unsigned int device,
char *name,
int number,
char *uid,
char *message,
unsigned char mode);
struct product_wpr{
char id[4];
char name[30];
};
typedef struct product_wpr product_wpr;
struct category_wpr{
unsigned char id;
char name[3];
char description[30];
};
typedef struct category_wpr category_wpr;
struct subcategory_wpr{
unsigned char id;
char name[3];
char description[30];
unsigned char idRoot;
};
typedef struct subCategory_wpr subCategory_wpr;
struct confPartner_wpr; // An opaque type that we'll use as a handle
typedef struct confPartner_wpr confPartner_wpr;
confPartner_wpr *confPartner_create(Product_wpr tableProducts[],
unsigned char numProducts,
Category_wpr tableCategories[],
unsigned char numCategories,
SubCategory_wpr tableSubCategories[],
unsigned char numSubCategories);
struct my_api_wpr;
typedef struct my_api_wpr my_api_wpr;
my_api_wpr *my_api_create(struct confGlobal_wpr cGlobal,
struct confPartner_wpr cPartner);
#ifdef __cplusplus
}
#endif

包装纸.cpp

confGlobal_wpr *confGlobal_create(unsigned int device,
char *name,
int number,
char *uid,
char *message,
unsigned char mode)
{
confGlobal_wpr *cg;
struct confGlobal confiGlobal;
confiGlobal.name = name;
confiGlobal.device = device;
confiGlobal.number = number;
confiGlobal.uid = uid;
confiGlobal.message = message;
if (mode == 0)
confiGlobal.mode = false;
else
confiGlobal.mode = true;
return cg;
}
void confGlobal_destroy(confGlobal_wpr *cg)
{
if (cg == NULL)
return;
delete static_cast<confGlobal_wpr *>(cg->instance); // ERROR: invalid static_cast from type ‘confGlobal’ to type ‘confGlobal_wpr*’
free(cg);
}
confPartner_wpr *confPartner_create(product_wpr tableProducts_wpr[],
unsigned char numProducts,
category_wpr tableCategories_wpr[],
unsigned char numCategories,
subCategory_wpr tableSubCategories_wpr[], 
unsigned char numSubCategories)
{
unsigned char i=0;
confPartner_wpr *cc;
struct confPartner cPartner;
vector< struct product> tableProduct;
vector< struct category> tableCategory;
vector< struct subCategory> tableSubCategory;
for (i=0; i<numProducts; i++)
{
struct product p;
p.id = tableProducts_wpr[i].id;
p.name = tableProducts_wpr[i].name;
tableProduct.push_back(p);
}
cPartner.tableProduct = tableProducts;
for (i=0; i<numCategories; i++)
{       
struct category c;
c.id = tableCategories_wpr[i].id;
c.nombre = tableCategories_wpr[i].name;
c.descripcion = tableCategories_wpr[i].description;
tableCategory.push_back(c);
}
cPartner.tableCategory = tableCategory;
for (i=0; i<numSubCategories; i++)
{
struct subZona sc;
sc.id = tableSubCategories_wpr[i].id;
sc.name = tableSubCategories_wpr[i].name;
sc.description = tableSubCategories_wpr[i].description;
sc.idRoot = tableSubCategories_wpr[i].idRoot;
tableSubCategory.push_back(sc);     
}
cPartner.tableSubCategory = tableSubCategory;
return cc;
}
my_api_wpr *my_api_create(struct confGlobal_wpr confiGlobal_wpr,
struct confPartner_wpr confiPartner_wpr)
{
my_api_wpr *my_api;
my_API *obj;
my_api = (typeof(my_api))malloc(sizeof(*my_api));
obj    = my_API::Instance(confiGlobal_wpr, confiConsorcio_wpr);
/* With this compile and linked OK
confGlobal cg;
confPartner cc;
obj    = my_API::Instance(cg, cc);
*/
my_api->obj = obj;
return my_api;
}
void my_api_destroy(ct_api_wpr *my_api)
{
if (my_api == NULL)
return;
delete static_cast<my_API *>(my_api->ptr_api); // ERROR: ‘virtual my_API::~my_API()’ is private within this context
free(my_api);
}

编译和链接时的输出错误：

g++ -shared -o libwrapper.so *.cpp wrapper.h -l:libthird-party.a -L. -ldl -lrt -Wl,-rpath /usr/local/lib -lc

In function ‘my_api_wpr* my_api_create(confGlobal_wpr, confPartner_wpr)’:
error: no matching function for call to ‘my_API::Instance(confGlobal_wpr&, confPartner_wpr&)’
obj    = my_API::Instance(confiGlobal_wpr, confiConsorcio_wpr);
^
my_API.h:30:20: note: candidate: static my_API* my_API::Instance(confGlobal, confPartner)
static my_API* Instance(struct confGlobal cGlobal, struct confiPartner cPartner);
^~~~~~~~
my_API.h:30:20: note:   no known conversion for argument 1 from ‘confGlobal_wpr’ to ‘confGlobal’