细谈在非WIFI状态下显示GIF缩略图效果

对配置文件读取操作的测试
为了对编写的配置文件读取操作程序进行测试，定义了员工信息结构体和雇主信息结构体，分别用于存放从配置文件中读取到的员工信息和雇主信息。在main函数中将获取到的信息打印出来，以此来检查程序操作的正确性。

六、C程序实现
本程序命名为“GetConfig.c”，具体代码如下：

/**********************************************************************
* 版权所有 (C)2015, Zhou Zhaoxiong。
*
* 文件名称：GetConfig.c
* 文件标识：无
* 内容摘要：演示Linux下配置文件的读取方法
* 其它说明：无
* 当前版本：V1.0
* 作者：Zhou Zhaoxiong
* 完成日期：20150507
*
**********************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

// 数据类型重定义
typedef unsigned char UINT8;
typedef signed int INT32;
typedef unsigned int UINT32;

// 员工信息结构体定义
typedef struct
{
UINT8 szEmployeeName[128]; // 员工姓名
INT32 iEmployeeAge; // 员工年龄
} T_EmployeeInfo;

// 雇主信息结构体定义
typedef struct
{
UINT8 szEmployerName[128]; // 雇主姓名
INT32 iEmployerAge; // 雇主年龄
} T_EmployerInfo;

// 函数声明
void GetCompletePath(UINT8 *pszConfigFileName, UINT8 *pszWholePath);
void GetStringContentValue(FILE *fp, UINT8 *pszSectionName, UINT8 *pszKeyName, UINT8 *pszOutput, UINT32 iOutputLen);
void GetConfigFileStringValue(UINT8 *pszSectionName, UINT8 *pszKeyName, UINT8 *pDefaultVal, UINT8 *pszOutput, UINT32 iOutputLen, UINT8 *pszConfigFileName);
INT32 GetConfigFileIntValue(UINT8 *pszSectionName, UINT8 *pszKeyName, UINT32 iDefaultVal, UINT8 *pszConfigFileName);
INT32 main();

/**********************************************************************
* 功能描述：主函数
* 输入参数：无
* 输出参数：无
* 返回值：无
* 其它说明：无
* 修改日期版本号修改人修改内容
* ---------------------------------------------------------------
* 20150507 V1.0 Zhou Zhaoxiong 创建
***********************************************************************/
INT32 main()
{
T_EmployeeInfo tEmployeeInfo = {0};
T_EmployerInfo tEmployerInfo = {0};

// 获取并打印员工信息
// 获取员工姓名
GetConfigFileStringValue("EMPLOYEEINFO", "EmployeeName", "", tEmployeeInfo.szEmployeeName, sizeof(tEmployeeInfo.szEmployeeName), "Config.ini");

// 获取员工年龄
tEmployeeInfo.iEmployeeAge = GetConfigFileIntValue("EMPLOYEEINFO", "EmployeeAge", 20, "Config.ini");
if (tEmployeeInfo.iEmployeeAge == -1) // 判断获取到的年龄是否正确
{
printf("Get EmployeeAge failed!\n");
return -1;
}

// 打印读取到的员工姓名和年龄
printf("EmployeeName is %s, EmployeeAge is %d\n", tEmployeeInfo.szEmployeeName, tEmployeeInfo.iEmployeeAge);

// 获取并打印雇主信息
// 获取雇主姓名
GetConfigFileStringValue("EMPLOYERINFO", "EmployerName", "", tEmployerInfo.szEmployerName, sizeof(tEmployerInfo.szEmployerName), "Config.ini");

// 获取员工年龄
tEmployerInfo.iEmployerAge = GetConfigFileIntValue("EMPLOYERINFO", "EmployerAge", 30, "Config.ini");
if (tEmployerInfo.iEmployerAge == -1) // 判断获取到的年龄是否正确
{
printf("Get EmployerAge failed!\n");
return -1;
}

// 打印读取到的员工姓名和年龄
printf("EmployerName is %s, EmployerAge is %d\n", tEmployerInfo.szEmployerName, tEmployerInfo.iEmployerAge);

return 0;
}

/**********************************************************************
* 功能描述：获取配置文件完整路径(包含文件名)
* 输入参数： pszConfigFileName-配置文件名
pszWholePath-配置文件完整路径(包含文件名)
* 输出参数：无
* 返回值：无
* 其它说明：无
* 修改日期版本号修改人修改内容
* ------------------------------------------------------------------
* 20150507 V1.0 Zhou Zhaoxiong 创建
********************************************************************/
void GetCompletePath(UINT8 *pszConfigFileName, UINT8 *pszWholePath)
{
UINT8 *pszHomePath = NULL;
UINT8 szWholePath[256] = {0};

// 先对输入参数进行异常判断
if (pszConfigFileName == NULL || pszWholePath == NULL)
{
printf("GetCompletePath: input parameter(s) is NULL!\n");
return;
}

pszHomePath = (UINT8 *)getenv("HOME"); // 获取当前用户所在的路径
if (pszHomePath == NULL)
{
printf("GetCompletePath: Can't find home path!\n");
return;
}

// 拼装配置文件路径
snprintf(szWholePath, sizeof(szWholePath)-1, "%s/zhouzx/GetConfig/%s", pszHomePath, pszConfigFileName);

strncpy(pszWholePath, szWholePath, strlen(szWholePath));
}

/**********************************************************************
* 功能描述：获取具体的字符串值
* 输入参数： fp-配置文件指针
pszSectionName-段名, 如: GENERAL
pszKeyName-配置项名, 如: EmployeeName
iOutputLen-输出缓存长度
* 输出参数： pszOutput-输出缓存
* 返回值：无
* 其它说明：无
* 修改日期版本号修改人修改内容
* ------------------------------------------------------------------
* 20150507 V1.0 Zhou Zhaoxiong 创建
********************************************************************/
void GetStringContentValue(FILE *fp, UINT8 *pszSectionName, UINT8 *pszKeyName, UINT8 *pszOutput, UINT32 iOutputLen)
{
UINT8 szSectionName[100] = {0};
UINT8 szKeyName[100] = {0};
UINT8 szContentLine[256] = {0};
UINT8 szContentLineBak[256] = {0};
UINT32 iContentLineLen = 0;
UINT32 iPositionFlag = 0;

// 先对输入参数进行异常判断
if (fp == NULL || pszSectionName == NULL || pszKeyName == NULL || pszOutput == NULL)
{
printf("GetStringContentValue: input parameter(s) is NULL!\n");
return;
}

sprintf(szSectionName, "[%s]", pszSectionName);
strcpy(szKeyName, pszKeyName);

while (feof(fp) == 0)
{
memset(szContentLine, 0x00, sizeof(szContentLine));
fgets(szContentLine, sizeof(szContentLine), fp); // 获取段名

// 判断是否是注释行(以;开头的行就是注释行)或以其他特殊字符开头的行
if (szContentLine[0] == ';' || szContentLine[0] == '\r' || szContentLine[0] == '\n' || szContentLine[0] == '\0')

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