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试图用 SDK 编译一个示例 http 类，并得到一些奇怪的链接错误……我确信它与缺少选项或目录有关……
如您所见，我不是 c++ 专家，但正在寻求任何帮助。
我包括了我的示例类。我也确实安装了 Windows SDK。如果您需要有关我的设置或任何其他信息，请询问。我希望有人将我指向一个有效的 WinHttp SDK 示例项目。
//START OF utils.cpp
#pragma once
#include "stdafx.h"
class http
{
public:
http();
~http();
std::string getText();
};
//END OF utils.cpp
//START OF utils.cpp
#include "stdafx.h"
#include "utils.h"
http::http()
{
}
http::~http()
{
}
std::string http::getText()
{
DWORD dwSize = 0;
DWORD dwDownloaded = 0;
LPSTR pszOutBuffer;
BOOL bResults = FALSE;
HINTERNET hSession = NULL,
hConnect = NULL,
hRequest = NULL;
// Use WinHttpOpen to obtain a session handle.
hSession = WinHttpOpen( L"WinHTTP Example/1.0",
WINHTTP_ACCESS_TYPE_DEFAULT_PROXY,
WINHTTP_NO_PROXY_NAME,
WINHTTP_NO_PROXY_BYPASS, 0 );
// Specify an HTTP server.
if( hSession )
hConnect = WinHttpConnect( hSession, L"www.microsoft.com",
INTERNET_DEFAULT_HTTPS_PORT, 0 );
// Create an HTTP request handle.
if( hConnect )
hRequest = WinHttpOpenRequest( hConnect, L"GET", NULL,
NULL, WINHTTP_NO_REFERER,
WINHTTP_DEFAULT_ACCEPT_TYPES,
WINHTTP_FLAG_SECURE );
// Send a request.
if( hRequest )
bResults = WinHttpSendRequest( hRequest,
WINHTTP_NO_ADDITIONAL_HEADERS, 0,
WINHTTP_NO_REQUEST_DATA, 0,
0, 0 );
// End the request.
if( bResults )
bResults = WinHttpReceiveResponse( hRequest, NULL );
// Keep checking for data until there is nothing left.
if( bResults )
{
do
{
// Check for available data.
dwSize = 0;
if( !WinHttpQueryDataAvailable( hRequest, &dwSize ) )
printf( "Error %u in WinHttpQueryDataAvailable.\n",
GetLastError( ) );
// Allocate space for the buffer.
pszOutBuffer = new char[dwSize+1];
if( !pszOutBuffer )
{
printf( "Out of memory\n" );
dwSize=0;
}
else
{
// Read the data.
ZeroMemory( pszOutBuffer, dwSize+1 );
if( !WinHttpReadData( hRequest, (LPVOID)pszOutBuffer,
dwSize, &dwDownloaded ) )
printf( "Error %u in WinHttpReadData.\n", GetLastError( ) );
else
printf( "%s", pszOutBuffer );
// Free the memory allocated to the buffer.
delete [] pszOutBuffer;
}
} while( dwSize > 0 );
}
// Report any errors.
if( !bResults )
printf( "Error %d has occurred.\n", GetLastError( ) );
// Close any open handles.
if( hRequest ) WinHttpCloseHandle( hRequest );
if( hConnect ) WinHttpCloseHandle( hConnect );
if( hSession ) WinHttpCloseHandle( hSession );
return "";
}
//END OF utils.cpp
1>------ Build started: Project: winagent, Configuration: Debug Win32 ------
1>Compiling...
1>utils.cpp
1>Linking...
1> Creating library C:\winagent\Debug\winagent.lib and object C:\winagent\Debug\winagent.exp
1>utils.obj : error LNK2019: unresolved external symbol __imp__WinHttpCloseHandle@4 referenced in function "public: class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __thiscall http::getText(void)" (?getText@http@@QAE?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@XZ)
1>utils.obj : error LNK2019: unresolved external symbol __imp__WinHttpReadData@16 referenced in function "public: class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __thiscall http::getText(void)" (?getText@http@@QAE?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@XZ)
1>utils.obj : error LNK2019: unresolved external symbol __imp__WinHttpQueryDataAvailable@8 referenced in function "public: class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __thiscall http::getText(void)" (?getText@http@@QAE?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@XZ)
1>utils.obj : error LNK2019: unresolved external symbol __imp__WinHttpReceiveResponse@8 referenced in function "public: class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __thiscall http::getText(void)" (?getText@http@@QAE?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@XZ)
1>utils.obj : error LNK2019: unresolved external symbol __imp__WinHttpSendRequest@28 referenced in function "public: class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __thiscall http::getText(void)" (?getText@http@@QAE?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@XZ)
1>utils.obj : error LNK2019: unresolved external symbol __imp__WinHttpOpenRequest@28 referenced in function "public: class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __thiscall http::getText(void)" (?getText@http@@QAE?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@XZ)
1>utils.obj : error LNK2019: unresolved external symbol __imp__WinHttpConnect@16 referenced in function "public: class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __thiscall http::getText(void)" (?getText@http@@QAE?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@XZ)
1>utils.obj : error LNK2019: unresolved external symbol __imp__WinHttpOpen@20 referenced in function "public: class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __thiscall http::getText(void)" (?getText@http@@QAE?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@XZ)
1>C:\winagent\Debug\winagent.exe : fatal error LNK1120: 8 unresolved externals
1>Build log was saved at "file://c:\winagent\Debug\BuildLog.htm"
1>winagent - 9 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
原文由 Kladskull 发布，翻译遵循 CC BY-SA 4.0 许可协议
如果您查看有关 WinHttp* 函数的 MSDN 参考资料，您会发现您需要与库 Winhttp.lib 链接。
打开项目设置，选择链接器选项，然后选择“输入”并将 WinHttp.lib 添加到“附加依赖项”列表中。
或者你可以把
（如前所述）在您的源代码中。