wininet_downloader_cpp

wininet.lib cpp 下载

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
#include <windows.h>
#include <wininet.h>
#include <string>
#include <iostream>
using namespace std;

#pragma comment(lib, "wininet.lib")

#define DOWNHELPER_AGENTNAME "downloader"
#define LEN_OF_BUFFER_FOR_QUERYINFO 128
#define DOWNLOAD_BUF_SIZE (10*1024)
#define MAX_DOWNLOAD_REQUEST_TIME 10
#define MAX_DOWNLOAD_BYTESIZE (10000*1024*1024)


BOOL _TryHttpSendRequest(LPVOID hRequest, int nMaxTryTimes);


BOOL DownloadUrl(std::string strUrl, std::string strFileName)
{
BOOL bRet = FALSE;
if (strUrl == "" || strFileName == "")
return FALSE;


HINTERNET hInet = NULL;
HINTERNET hConnect = NULL;
HINTERNET hRequestHead = NULL;
HINTERNET hRequestGet = NULL;
HANDLE hFileWrite = NULL;
char* pBuf = NULL;
DWORD dwRequestTryTimes = MAX_DOWNLOAD_REQUEST_TIME;
DWORD dwDownBytes = 0;
DWORD dwDownFileTotalBytes = 0;
DWORD dwWriteBytes = 0;
char bufQueryInfo[LEN_OF_BUFFER_FOR_QUERYINFO] = {0};
DWORD dwBufQueryInfoSize = sizeof(bufQueryInfo);
DWORD dwStatusCode = 0;
DWORD dwContentLen = 0;
DWORD dwSizeDW = sizeof(DWORD);


CHAR pszHostName[INTERNET_MAX_HOST_NAME_LENGTH] = {0};
CHAR pszUserName[INTERNET_MAX_USER_NAME_LENGTH] = {0};
CHAR pszPassword[INTERNET_MAX_PASSWORD_LENGTH] = {0};
CHAR pszURLPath[INTERNET_MAX_URL_LENGTH] = {0};
CHAR szURL[INTERNET_MAX_URL_LENGTH] = {0};
URL_COMPONENTSA urlComponents = {0};
urlComponents.dwStructSize = sizeof(URL_COMPONENTSA);
urlComponents.lpszHostName = pszHostName;
urlComponents.dwHostNameLength = INTERNET_MAX_HOST_NAME_LENGTH;
urlComponents.lpszUserName = pszUserName;
urlComponents.dwUserNameLength = INTERNET_MAX_USER_NAME_LENGTH;
urlComponents.lpszPassword = pszPassword;
urlComponents.dwPasswordLength = INTERNET_MAX_PASSWORD_LENGTH;
urlComponents.lpszUrlPath = pszURLPath;
urlComponents.dwUrlPathLength = INTERNET_MAX_URL_LENGTH;

bRet = InternetCrackUrlA(strUrl.c_str(), 0, NULL, &urlComponents);
bRet = (bRet && urlComponents.nScheme == INTERNET_SERVICE_HTTP);
if (!bRet)
{
goto _END_OF_DOWNLOADURL;
}


hInet = InternetOpenA(DOWNHELPER_AGENTNAME, INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, NULL);
if (!hInet)
{
bRet = FALSE;
goto _END_OF_DOWNLOADURL;
}


hConnect = InternetConnectA(hInet, pszHostName, urlComponents.nPort, pszUserName, pszPassword, INTERNET_SERVICE_HTTP, 0, NULL);
if (!hConnect)
{
bRet = FALSE;
goto _END_OF_DOWNLOADURL;
}


if (urlComponents.dwUrlPathLength != 0)
strcpy(szURL, urlComponents.lpszUrlPath);
else
strcpy(szURL, "/");

hRequestHead = HttpOpenRequestA(hConnect, "HEAD", szURL, "HTTP/1.1", "", NULL, INTERNET_FLAG_RELOAD, 0);
bRet = _TryHttpSendRequest(hRequestHead, dwRequestTryTimes);
if (!bRet)
{
goto _END_OF_DOWNLOADURL;
}


dwContentLen = 0;
dwSizeDW = sizeof(DWORD);
bRet = HttpQueryInfo(hRequestHead, HTTP_QUERY_FLAG_NUMBER | HTTP_QUERY_CONTENT_LENGTH, &dwContentLen, &dwSizeDW, NULL);
if (bRet)
{

if (dwContentLen > MAX_DOWNLOAD_BYTESIZE)
{
bRet = FALSE;
goto _END_OF_DOWNLOADURL;
}
}


hRequestGet = HttpOpenRequestA(hConnect, "GET", szURL, "HTTP/1.1", "", NULL, INTERNET_FLAG_RELOAD, 0);
bRet = _TryHttpSendRequest(hRequestGet, dwRequestTryTimes);
if (!bRet)
{
goto _END_OF_DOWNLOADURL;
}


hFileWrite = CreateFileA(strFileName.c_str(), GENERIC_WRITE, FILE_SHARE_READ, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
if (INVALID_HANDLE_VALUE == hFileWrite)
{
bRet = FALSE;
goto _END_OF_DOWNLOADURL;
}


pBuf = new char[DOWNLOAD_BUF_SIZE];
if (!pBuf)
{
bRet = FALSE;
goto _END_OF_DOWNLOADURL;
}


dwDownFileTotalBytes = 0;
while (1)
{
dwDownBytes = 0;
memset(pBuf, 0, DOWNLOAD_BUF_SIZE*sizeof(char));
bRet = InternetReadFile(hRequestGet, pBuf, DOWNLOAD_BUF_SIZE, &dwDownBytes);
if (bRet)
{
if (dwDownBytes > 0)
{
dwDownFileTotalBytes += dwDownBytes;
bRet = WriteFile(hFileWrite, pBuf, dwDownBytes, &dwWriteBytes, NULL);
if (!bRet)
{
goto _END_OF_DOWNLOADURL;
}
}
else if (0 == dwDownBytes)
{
bRet = TRUE;
break;
}
}
}


_END_OF_DOWNLOADURL:
if (INVALID_HANDLE_VALUE != hFileWrite)
CloseHandle(hFileWrite);
if (pBuf)
delete [] pBuf;
if (hRequestGet)
InternetCloseHandle(hRequestGet);
if (hRequestHead)
InternetCloseHandle(hRequestHead);
if (hConnect)
InternetCloseHandle(hConnect);
if (hInet)
InternetCloseHandle(hInet);

return bRet;
}


BOOL _TryHttpSendRequest(LPVOID hRequest, int nMaxTryTimes)
{
BOOL bRet = FALSE;
DWORD dwStatusCode = 0;
DWORD dwSizeDW = sizeof(DWORD);
while (hRequest && (nMaxTryTimes-- > 0))
{

bRet = HttpSendRequestA(hRequest, NULL, 0, NULL, 0);
if (!bRet)
{
continue;
}
else
{

dwStatusCode = 0;
dwSizeDW = sizeof(DWORD);
bRet = HttpQueryInfo(hRequest, HTTP_QUERY_FLAG_NUMBER | HTTP_QUERY_STATUS_CODE, &dwStatusCode, &dwSizeDW, NULL);
if (bRet)
{

if (HTTP_STATUS_OK == dwStatusCode)
{
break;
}
else
{
bRet = FALSE;
continue;
}
}
}
}

return bRet;
}


int main(int argc, char* argv[])
{
cout<< "pls input downloadurl:";

char str[80];
cin.get(str,80);

BOOL bR = DownloadUrl(str, "temp.png");
cout << "Downloading..."<<endl;
if (bR)
cout << "ok" << endl;
else
cout << "no" << endl;
return 0;
}
士不可以不弘毅,任重而道远。仁以为己任,不亦重乎?死而后已,不亦远乎?

本文标题:wininet_downloader_cpp

文章作者:yaron

发布时间:2019年02月28日 - 17:49:30

最后更新:2019年02月28日 - 21:17:19

原文链接:https://yaalonsong.github.io/2019/02/28/wininet_downloader_cpp.html

许可协议: 署名-非商业性使用-禁止演绎 4.0 国际 转载请保留原文链接及作者。