注意：这最初发布到由生成的地址结构
gSoap 实用程序，但它一般适用于 任何 嵌套结构
用指针...
下面描述了一种 ANSI C 方法，用于初始化、分配、分配和释放嵌套结构构造中的成员和指针，其中嵌套部分中的字段数在运行时之前是未知的。
为了解释需要这种处理的结构的形状，数据模式由 已知 个 header 字段组成，每个字段每行有一个值。最后一个字段（行）用作 header 和 data 部分之间的分隔符 ********。数据部分包含 未知 数量的数据记录，但每条记录都包含已知（且恒定）数量的逗号分隔字段：
示例数据：
下面显示的两个文件都有完整的注释。他们将一起使用任何 ANSI C 编译器进行编译和构建：
InitComplexStructs.h：
//The struct names typical in gSoap generated code
//are longer and more complicated.
//for example, a typical client soap_call___ns...()
//function prototype may look like this:
//SOAP_FMAC5 int SOAP_FMAC6 soap_call___ns1__SendLEDF(struct soap *soap, const char *soap_endpoint, const char *soap_action, struct _ns3__ledf_send *ns3__xxmtsvclws, struct _ns3__ledf_recv *ns3__xxmtsvclwsResponse)
//where areguments 4 & 5 are respectively:
// arg 4: struct _ns3__ledf_send *ns3__xxmtsvclws
// arg 5: struct _ns3__ledf_recv *ns3__xxmtsvclwsResponse
//
//for this project we will assume arg 4 represents a complex (nested)
//set of data structures, and for illustration purposes, shorten the
//name to aaa:
// struct aaa contains members to accomodate a fixed number of strings
// as well as a pointer to struct bbb
struct aaa {
char *aaaStr1;
char *aaaStr2;
char *aaaStr3;
char *aaaStr4;
char *aaaStr5;
struct bbb *pBbb;
};
// struct bbb is used to set array order size
// (or the number of copies necessary of struct ccc)
// it contains the array size (index value) member "numRows"
// and a pointer to a struct, which will work like a pointer
// to array of struct ccc
struct bbb {
int numRows;
struct ccc *row;
};
// struct ccc contains members to accomodate a variable number of
// sets of strings, number of sets determined by the array row[]
// initialized to array size "numRows" in struct bbb
// (see initComplexStructs.c for how this is done)
struct ccc {
char *cccStr1;
char *cccStr2;
char *cccStr3;
char *cccStr4;
char *cccStr5;
};
InitComplexStructs.c
///////////////////////////////////////////////////////////
///// Using nested data structures ////////////////////////
///////////////////////////////////////////////////////////
//
// client-side gSoap generated code will often use nested
// data structures to accomodate complex data types
// used in the 4th and 5th arguments of the client
// soap_call__ns...() functions.
//
// This program illustrates how to work with these
// structures by a calling application in the
// following way :
//
// - Initialization of structs
// - Allocation of structs and members
// - Assignment of values to members
// - Freeing of allocated memory
//
///////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////
#include <ansi_c.h>
#include "InitComplexStructs.h"
struct aaa _aaa, *p_aaa;
struct bbb _bbb, *p_bbb;
struct ccc _row, *p_row;
void InitializeStructs(void);
void AllocateStructs(void);
void AssignStructs(void);
void FreeStructs(void);
char typicalStr[]={"aaaStr 1"};
size_t sizeStr = sizeof(typicalStr);
void main (void)
{
InitializeStructs();
AllocateStructs();
AssignStructs();
FreeStructs();
}
void InitializeStructs(void)
{
p_aaa = &_aaa;
p_bbb = &_bbb;
p_row = &_row;
}
void AllocateStructs(void)
{
int i;
//allocate members of p_aaa
p_aaa->aaaStr1 = calloc(sizeStr, 1);
p_aaa->aaaStr2 = calloc(sizeStr, 1);
p_aaa->aaaStr3 = calloc(sizeStr, 1);
p_aaa->aaaStr4 = calloc(sizeStr, 1);
p_aaa->aaaStr5 = calloc(sizeStr, 1);
p_aaa->pBbb = malloc( sizeof(*p_bbb));
//Allocate member of next nested struct - pBbb
//Note: The order of array is determined
//by the value assigned to "numRows"
//Note also: the value for numRows could be passed in by argument
//since the calling function has this information.
//Just requires prototype mod from void to int argument.
p_aaa->pBbb->numRows = 3;
p_aaa->pBbb->row = calloc(p_aaa->pBbb->numRows,sizeof(*p_row));
//Allocate the innermost struct ccc accessed through *row
for(i=0;i<p_aaa->pBbb->numRows;i++)
{
p_aaa->pBbb->row[i].cccStr1 = calloc(sizeStr, 1);
p_aaa->pBbb->row[i].cccStr2 = calloc(sizeStr, 1);
p_aaa->pBbb->row[i].cccStr3 = calloc(sizeStr, 1);
p_aaa->pBbb->row[i].cccStr4 = calloc(sizeStr, 1);
p_aaa->pBbb->row[i].cccStr5 = calloc(sizeStr, 1);
}
}
void AssignStructs(void)
{
int i;
strcpy(p_aaa->aaaStr1, "aaaStr 1");
strcpy(p_aaa->aaaStr1, "aaaStr 2");
strcpy(p_aaa->aaaStr1, "aaaStr 3");
strcpy(p_aaa->aaaStr1, "aaaStr 4");
strcpy(p_aaa->aaaStr1, "aaaStr 5");
for(i=0;i<p_aaa->pBbb->numRows;i++)
{
strcpy(p_aaa->pBbb->row[i].cccStr1, "bbbStr 1");
strcpy(p_aaa->pBbb->row[i].cccStr2, "bbbStr 2");
strcpy(p_aaa->pBbb->row[i].cccStr3, "bbbStr 3");
strcpy(p_aaa->pBbb->row[i].cccStr4, "bbbStr 4");
strcpy(p_aaa->pBbb->row[i].cccStr5, "bbbStr 5");
}
}
void FreeStructs(void)
{
int i;
for(i=0;i<p_aaa->pBbb->numRows;i++)
{
free(p_aaa->pBbb->row[i].cccStr1);
free(p_aaa->pBbb->row[i].cccStr2);
free(p_aaa->pBbb->row[i].cccStr3);
free(p_aaa->pBbb->row[i].cccStr4);
free(p_aaa->pBbb->row[i].cccStr5);
}
free(p_aaa->pBbb->row);
free(p_aaa->pBbb);
free(p_aaa->aaaStr1);
free(p_aaa->aaaStr2);
free(p_aaa->aaaStr3);
free(p_aaa->aaaStr4);
free(p_aaa->aaaStr5);
}