一、获取下载结果（成功或失败）方法
使用curl命令下载文件，通过--progress-bar获取进度，通过读取打印结果判断下载完成情况。
正常下载完成，curl打印信息如下：
#=#=#
##O#-#
##O=# #
#=#=-# #
0.0%
0.1%
0.1%
0.1%
0.2%
0.2%
0.3%
0.3%
0.4%
0.4%
0.4%
0.5%
0.6%
0.6%
0.7%
0.8%
0.9%
0.9%
0.9%
1.0%
##################################################################### 96.1%
##################################################################### 96.8%
##################################################################### 97.0%
##################################################################### 97.2%
###################################################################### 97.3%
###################################################################### 97.7%
###################################################################### 97.9%
###################################################################### 98.1%
###################################################################### 98.2%
###################################################################### 98.4%
###################################################################### 98.6%
####################################################################### 98.8%
####################################################################### 98.9%
####################################################################### 99.1%
####################################################################### 99.3%
####################################################################### 99.6%
####################################################################### 99.7%
####################################################################### 100.0%
######################################################################## 100.0%下载过程中异常，curl打印信息如下：
#=#=#
##O#-#
##O=# #
#=#=-# #
-#O#- # #
-=#=# # #
-=O#-# # #
-=O=# # # #
0.0%
0.1%
0.1%
0.1%
0.1%
0.2%
0.2%
0.3%
0.3%
0.3%
0.3%
0.3%
0.3%curl: (18) Recv failure: Connection was reset下载文件（成功或失败）代码
#include "stdafx.h"
#include <ShlObj.h>
#include <string>
int main()
{
bool bDownloadSuccess = false;
SHELLEXECUTEINFO sei;
ZeroMemory(&sei, sizeof(SHELLEXECUTEINFO));
sei.cbSize = sizeof(SHELLEXECUTEINFO);
sei.nShow = SW_HIDE;
sei.fMask = SEE_MASK_NOCLOSEPROCESS;
sei.hInstApp = NULL;
sei.lpVerb = NULL;
sei.lpVerb = _T("open");
sei.lpFile = _T("cmd");
sei.lpParameters = _T("/c curl.exe -o d:\\downloadfile.zip http://repository.maemo.org/pool/maemo3.2/free/binary/apt_0.6.42.3osso19_armel.deb --progress-bar > d:\\3.log 2>&1");//程序的参数
sei.lpDirectory = _T("C:\\Users\\Administrator\\Downloads\\curl-8.0.1_7-win32\\curl-8.0.1_7-win64-mingw\\bin");
if (ShellExecuteEx(&sei))//执行成功
{
if (sei.hProcess)//指定 SEE_MASK_NOCLOSEPROCESS 并其成功执行，则 hProcess 将会返回执行成功的进程句柄
{
WaitForSingleObject(sei.hProcess, INFINITE);//等待执行完毕
if (sei.hProcess != NULL)
{
CloseHandle(sei.hProcess);
sei.hProcess = NULL;
}
//读取log文件
FILE * fLogFile = NULL;
errno_t errnoFile = fopen_s(&fLogFile, "d:\\3.log", "r");
if (0 == errnoFile && fLogFile != NULL)
{
fseek(fLogFile, 0, SEEK_END);
unsigned long uTotalSize = ftell(fLogFile);
fseek(fLogFile, -8, SEEK_END);
char szProgerss[1024] = { 0 };
fread(szProgerss, 1, 8, fLogFile);
if (strstr(szProgerss, "100.0%") != NULL)
{
bDownloadSuccess = true;
printf("download success.\n");
}
else
{
memset(szProgerss, 0, sizeof(szProgerss));
if (uTotalSize >= 512)
{
fseek(fLogFile, -512, SEEK_END);
fread(szProgerss, 1, 512, fLogFile);
}
else
{
fseek(fLogFile, 0, SEEK_SET);
fread(szProgerss, 1, uTotalSize, fLogFile);
}
std::string strFailBecause = "";
std::string strResult = szProgerss;
std::size_t posBegin = strResult.rfind("curl:");
if (posBegin != std::string::npos)
{
std::size_t posEnd = strResult.find("\n", posBegin + strlen("curl:"));
if (posEnd != std::string::npos)
{
strFailBecause = strResult.substr(posBegin, posEnd - posBegin);
}
else
{
strFailBecause = strResult.substr(posBegin);
}
}
printf("download fail. %s\n", strFailBecause.c_str());
}
fclose(fLogFile);
}
DeleteFile(_T("d:\\3.log"));
}
}
system("pause");
return 0;
}二、获取下载进度方法
使用curl命令下载文件，通过--progress-bar获取进度，通过定时读取（共享文件读）打印结果判断下载进度情况。
获取下载进度代码
#include "stdafx.h"
#include <ShlObj.h>
#include <string>
void FileProgress(const char *pFilePath, bool bWaitFileProcessExit, bool & bIsSuccess, float & fProgess, std::string & strBecause)
{
bIsSuccess = false;
strBecause = "";
FILE * fLogFile = NULL;
fLogFile = _fsopen(pFilePath, "r", _SH_DENYNO);//共享读
if (fLogFile != NULL)
{
fseek(fLogFile, 0, SEEK_END);
unsigned long uTotalSize = ftell(fLogFile);
fseek(fLogFile, -8, SEEK_END);
char szProgerss[1024] = { 0 };
fread(szProgerss, 1, 8, fLogFile);
if (strstr(szProgerss, "100.0%") != NULL)
{
fProgess = 100.0;
bIsSuccess = true;
printf("download success. progress:100.0\n");
}
else
{
if (bWaitFileProcessExit)
{
memset(szProgerss, 0, sizeof(szProgerss));
if (uTotalSize >= 256)
{
fseek(fLogFile, -256, SEEK_END);
fread(szProgerss, 1, 256, fLogFile);
}
else
{
fseek(fLogFile, 0, SEEK_SET);
fread(szProgerss, 1, uTotalSize, fLogFile);
}
std::string strFailBecause = "";
std::string strResult = szProgerss;
std::size_t posBegin = strResult.rfind("curl:");
if (posBegin != std::string::npos)
{
std::size_t posEnd = strResult.find("\n", posBegin + strlen("curl:"));
if (posEnd != std::string::npos)
{
strFailBecause = strResult.substr(posBegin, posEnd - posBegin);
}
else
{
strFailBecause = strResult.substr(posBegin);
}
}
strBecause = strFailBecause;
printf("download fail. %s\n", strFailBecause.c_str());
}
else
{
memset(szProgerss, 0, sizeof(szProgerss));
if (uTotalSize >= 256)
{
fseek(fLogFile, -256, SEEK_END);
fread(szProgerss, 1, 256, fLogFile);
}
else
{
fseek(fLogFile, 0, SEEK_SET);
fread(szProgerss, 1, uTotalSize, fLogFile);
}
std::string strProgress = "";
std::string strResult = szProgerss;
std::size_t posEnd = strResult.rfind("%");
if (posEnd != std::string::npos)
{
std::size_t posBegin = strResult.rfind(" ", posEnd + 1);
if (posBegin != std::string::npos)
{
strProgress = strResult.substr(posBegin+1, posEnd - posBegin - 1);
}
}
fProgess = atof(strProgress.c_str());
printf("download progress:%.1f\n", fProgess);
}
}
fclose(fLogFile);
fLogFile = NULL;
}
else
{
fProgess = 0;
}
}
int main()
{
bool bDownloadSuccess = false;
SHELLEXECUTEINFO sei;
ZeroMemory(&sei, sizeof(SHELLEXECUTEINFO));
sei.cbSize = sizeof(SHELLEXECUTEINFO);
sei.nShow = SW_HIDE;
sei.fMask = SEE_MASK_NOCLOSEPROCESS;
sei.hInstApp = NULL;
sei.lpVerb = NULL;
sei.lpVerb = _T("open");
sei.lpFile = _T("cmd");
sei.lpParameters = _T("/c curl.exe -o d:\\downloadfile.zip http://repository.maemo.org/pool/maemo3.2/free/binary/apt_0.6.42.3osso19_armel.deb --progress-bar > d:\\4.log 2>&1");//程序的参数
sei.lpDirectory = _T("C:\\Users\\Administrator\\Downloads\\curl-8.0.1_7-win32\\curl-8.0.1_7-win64-mingw\\bin");
if (ShellExecuteEx(&sei))//执行成功
{
if (sei.hProcess)//指定 SEE_MASK_NOCLOSEPROCESS 并其成功执行，则 hProcess 将会返回执行成功的进程句柄
{
bool bIsDownloadSuccess = false;
float fDownloadProgress = 0;
std::string strDownloadFailBecause = "";
DWORD dwRet = 0;
while (true)
{
dwRet = WaitForSingleObject(sei.hProcess, 500);
if (dwRet == WAIT_OBJECT_0)
{
//读取log文件
FileProgress("d:\\4.log", true, bIsDownloadSuccess, fDownloadProgress, strDownloadFailBecause);
break;
}
else if (dwRet == WAIT_TIMEOUT)
{
//读取log文件
FileProgress("d:\\4.log", false, bIsDownloadSuccess, fDownloadProgress, strDownloadFailBecause);
continue;
}
else
{
//读取log文件
FileProgress("d:\\4.log", false, bIsDownloadSuccess, fDownloadProgress, strDownloadFailBecause);
continue;
}
}
if (sei.hProcess != NULL)
{
CloseHandle(sei.hProcess);
sei.hProcess = NULL;
}
printf("download status:%d progress:%.1f failBeacuse:%s\n", bIsDownloadSuccess == true ? 1 : 0, fDownloadProgress, strDownloadFailBecause.c_str());
DeleteFile(_T("d:\\4.log"));
}
}
system("pause");
return 0;
}