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gSoap实现ONVIF中xsd__anyType到具体结构类型的转换

陶睿
2023-12-01

上一篇文章已经粗略计划要讨论gsoap关于序列化/解析编程。

本文则阐述一下关于gsoap生成代码的一些重要特征方法及使用。如题,下我们从ONVIF生成的C码中,挑选简单的一个类型来试验一下与xsd__anyType之间的转换。这个试验如此重要,主要是因为,在之前我真的拿生成代码的相关结构的的一些__any字段没有办法。虽依据ONVIF文档,以及实际交互观测的XML结构中可知明明是已知的标准结构,却无奈生成被解析成any字段,主要是可能这部分字段可由厂商决定填充哪些扩展意义的结构。

简单试验

本次试验选_trt__GetProfile结构作转换例程,主要理由是这个结构实在简单,只含有一个字段;书写初始化简单。

struct _trt__GetProfile

#soapStub.h

 

#ifndef SOAP_TYPE__trt__GetProfile
#define SOAP_TYPE__trt__GetProfile (1365)
/* trt:GetProfile */
struct _trt__GetProfile
{
	char *ProfileToken;	/* required element of type tt:ReferenceToken */
};
#endif

 

头部概览与FD操作

#include "inc.h"
typedef struct soap *soap_pointer;
#include "soap.nsmap"

// anyType
int anyType_ready(void)
{
	return open("anyType.xml", O_RDWR|O_CREAT, S_IWUSR|S_IRUSR);
}
int FD_set(int* FD, int fd)
{
	int ret = *FD; *FD = fd;
	return ret;
}

注:inc.h是自组织的部分所需头依赖;

后面包含了soap.nsmap文件,你懂的,里面解开可以可以依次了解清楚包含与依赖关系;

soap.nsmap < soapH.h < soapStub.h < stdsoap2.h

主流程 main()

static xsd__anyType* _trt__GetProfile2anyType(soap_pointer soap_, struct _trt__GetProfile* p_, xsd__anyType* _any);
static struct _trt__GetProfile*
_trt__GetProfile_from_anyType(soap_pointer soap_, struct _trt__GetProfile* _p, xsd__anyType* _any);

int main(int argc, char const *argv[])
{
	/* code */
	struct soap soap;
	soap_pointer soap_ = &soap;
	soap_init(soap_);
	struct _trt__GetProfile Data = {"Profile0"};
	xsd__anyType Dom; soap_default_xsd__anyType(soap_, &Dom);
	if (_trt__GetProfile2anyType(soap_, &Data, &Dom))
	{
		soap_default__trt__GetProfile(soap_, &Data);
		if (_trt__GetProfile_from_anyType(soap_, &Data, &Dom))
			printf("Data >%s", Data.ProfileToken);
	}
	soap_end(soap_);soap_done(soap_);
	return 0;
}

 

具体转换实现

xsd__anyType* _trt__GetProfile2anyType( soap_pointer soap_, struct _trt__GetProfile* p_, xsd__anyType* _any )
{
	int fd = anyType_ready();
	bool b = (fd == -1);
	if (b) return NULL;
	do {
		int* FD = &(soap_->sendfd);
		fd = FD_set(FD, fd);
		b  = (soap_write__trt__GetProfile(soap_, p_) != SOAP_OK);
		fd = FD_set(FD, fd);
		b = b ||(lseek(fd, 0, SEEK_SET) == -1);
		if (b) break;
		FD = &(soap_->recvfd);
		fd = FD_set(FD, fd);
		b  = (soap_read_xsd__anyType(soap_, _any) != SOAP_OK);
		fd = FD_set(FD, fd);
	} while(false);
	close(fd);
	if (b) return NULL;
	return _any;
}
struct _trt__GetProfile* _trt__GetProfile_from_anyType(soap_pointer soap_,
struct _trt__GetProfile* _p, xsd__anyType* _any)
{
	int fd = anyType_ready();
	bool b = (fd == -1);
	if (b) return NULL;
	do {
		int* FD = &(soap_->sendfd);
		fd = FD_set(FD, fd);
		b  = (soap_write_xsd__anyType(soap_, _any) != SOAP_OK);
		fd = FD_set(FD, fd);
		b = b ||(lseek(fd, 0, SEEK_SET) == -1);
		if (b) break;
		FD = &(soap_->recvfd);
		fd = FD_set(FD, fd);
		b  = (soap_read__trt__GetProfile(soap_, _p) != SOAP_OK);
		fd = FD_set(FD, fd);
	} while(false);
	close(fd);
	if (b) return NULL;
	return _p;
}

 

参考相关

本次试验启发于gsoap指南

gSOAP 2.8.11 User Guide

7.5.3 Serializing C/C++ Data to XML

You can assign an output stream to soap.os or a le descriptor to soap.sendfd. For example

soap.sendfd = open(file, O_RDWR|O_CREAT, S_IWUSR|S_IRUSR);
soap_serialize_PointerTons_Person(&soap, &p);
soap_begin_send(&soap);
soap_put_PointerTons_Person(&soap, &p, "ns:element-name", "ns:type-name");
soap_end_send(&soap);

The above can be abbreviated to

soap.sendfd = open(file, O_RDWR|O_CREAT, S_IWUSR|S_IRUSR);
soap_write_PointerTons_Person(&soap, &p);

gSoap生成代码的重要使用特征

 

生成清单

  • soapStub.h
  • soapClient.c
  • soapH.h
  • soapC.c
  • soap.nsmap

这是客户端的生成简单,soapClient.c 是soapStub.h的实现, soapC.c是soapH.h的实现,soap.nsmap是定义全局编译所需的xmlns集合namespaces[];

我们主要通过调用soapStub.h声明的方法来完成Service的访问,其中封装了交互过程;所有结构都定义在soapStub.h中有声明;

当然soapH.h则对应每一个结构都生成了相应的序列化/解析的方法,以及一些读写宏。

soapStub.h

所有交互命令的调用及结构声明;

soapH.h

#ifndef SOAP_TYPE_xsd__duration
#define SOAP_TYPE_xsd__duration (190)
#endif
SOAP_FMAC1 void SOAP_FMAC2 soap_default_xsd__duration(struct soap*, LONG64 *);

SOAP_FMAC3S const char* SOAP_FMAC4S soap_xsd__duration2s(struct soap*, LONG64);
SOAP_FMAC1 int SOAP_FMAC2 soap_out_xsd__duration(struct soap*, const char*, int, const LONG64 *, const char*);

SOAP_FMAC3S int SOAP_FMAC4S soap_s2xsd__duration(struct soap*, const char*, LONG64 *);
SOAP_FMAC1 LONG64 * SOAP_FMAC2 soap_in_xsd__duration(struct soap*, const char*, LONG64 *, const char*);

SOAP_FMAC3 int SOAP_FMAC4 soap_put_xsd__duration(struct soap*, const LONG64 *, const char*, const char*);

#ifndef soap_write_xsd__duration
#define soap_write_xsd__duration(soap, data) ( soap_serialize_xsd__duration(soap, data), soap_begin_send(soap) || soap_put_xsd__duration(soap, data, "xsd:duration", NULL) || soap_end_send(soap), soap->error )
#endif

SOAP_FMAC3 LONG64 * SOAP_FMAC4 soap_get_xsd__duration(struct soap*, LONG64 *, const char*, const char*);

#ifndef soap_read_xsd__duration
#define soap_read_xsd__duration(soap, data) ( soap_begin_recv(soap) || !soap_get_xsd__duration(soap, data, NULL, NULL) || soap_end_recv(soap), soap->error )
#endif


我们能见到大量类似这样规则的定义,每个方法的前置宏声明是有区别意义的。

SOAP_FMAC3S 这是序列化成字符串的方法修饰;这类方法主要是一类简单的基本类型到字符串的序列化转换, 比如ONVIF中有定义许多的枚举;

具体这么多修饰宏的意义可以参照stdsoap2.h中描述,在VC环境下使用助手的outline功夫查看文件代码结构是相当直观的。

另外我们还看见每一种类型都定义了soap_read/write_***的函式宏,本文试验主要就是通过这类读写来实现不同实现结构的转换的。

标准化

总之,为了工作简洁高效,日后可读可维护,我们尽量使用标准化的调用方式,而不走偏方,这才是本文针对各编程界提倡的建议。

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