我有一个很大的问题。我正在尝试使用WinHttp下载带有C ++的文件，我正在使用Visual Studio 2010来做这件事。
我的问题是程序没有编译，因为生成了307个错误，都引用了winhttp.h。我提到我已经包含了该文件。可能是什么问题呢？谢谢！
有一些：
------ Build started: Project: a, Configuration: Debug Win32 ------
b. Cpp
a. Cpp
c: \program files (x86)\microsoft sdks\windows\v7.0a\include\winhttp. H(50): error C2146:
Syntax error: missing ';' before identifier 'HINTERNET'
c: \program files (x86)\microsoft sdks\windows\v7.0a\include\winhttp. H(50): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
c: \program files (x86)\microsoft sdks\windows\v7.0a\include\winhttp. H(50): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
c: \program files (x86)\microsoft sdks\windows\v7.0a\include\winhttp. H(51): error C2143: syntax error: missing ';' before '*'
c: \program files (x86)\microsoft sdks\windows\v7.0a\include\winhttp. H(51): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
c: \program files (x86)\microsoft sdks\windows\v7.0a\include\winhttp. H(51): error C2378: 'HINTERNET': redefinition; symbol cannot be overloaded with a typedef
c: \program files (x86)\microsoft sdks\windows\v7.0a\include\winhttp. H(50): see declaration of 'HINTERNET'
c: \program files (x86)\microsoft sdks\windows\v7.0a\include\winhttp. H(51): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
c: \program files (x86)\microsoft sdks\windows\v7.0a\include\winhttp. H(53): error C2146: syntax error: missing ';' before identifier 'INTERNET_PORT'
c: \program files (x86)\microsoft sdks\windows\v7.0a\include\winhttp. H(53): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
c: \program files (x86)\microsoft sdks\windows\v7.0a\include\winhttp. H(53): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
c: \program files (x86)\microsoft sdks\windows\v7.0a\include\winhttp. H(54): error C2143: syntax error: missing ';' before '*'
c: \program files (x86)\microsoft sdks\windows\v7.0a\include\winhttp. H(54): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
c: \program files (x86)\microsoft sdks\windows\v7.0a\include\winhttp. H(54): error C2378: 'INTERNET_PORT': redefinition; symbol cannot be overloaded with a typedef
c: \program files (x86)\microsoft sdks\windows\v7.0a\include\winhttp. H(53): see declaration of 'INTERNET_PORT'
c: \program files (x86)\microsoft sdks\windows\v7.0a\include\winhttp. H(54): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
c: \program files (x86)\microsoft sdks\windows\v7.0a\include\winhttp. H(95): error C2146: syntax error: missing ';' before identifier 'dwResult'
c: \program files (x86)\microsoft sdks\windows\v7.0a\include\winhttp. H(95): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
c: \program files (x86)\microsoft sdks\windows\v7.0a\include\winhttp. H(95): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
c: \program files (x86)\microsoft sdks\windows\v7.0a\include\winhttp. H(96): error C2146: syntax error: missing ';' before identifier 'dwError'
c: \program files (x86)\microsoft sdks\windows\v7.0a\include\winhttp. H(96): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
c: \program files (x86)\microsoft sdks\windows\v7.0a\include\winhttp. H(96): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
c: \program files (x86)\microsoft sdks\windows\v7.0a\include\winhttp. H(107): error C2146: syntax error: missing ';' before identifier 'dwMajorVersion'
c: \program files (x86)\microsoft sdks\windows\v7.0a\include\winhttp. H(107): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
c: \program files (x86)\microsoft sdks\windows\v7.0a\include\winhttp. H(107): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
c: \program files (x86)\microsoft sdks\windows\v7.0a\include\winhttp. H(108): error C2146: syntax error: missing ';' before identifier 'dwMinorVersion'
c: \program files (x86)\microsoft sdks\windows\v7.0a\include\winhttp. H(108): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
c: \program files (x86)\microsoft sdks\windows\v7.0a\include\winhttp. H(108): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
c: \program files (x86)\microsoft sdks\windows\v7.0a\include\winhttp. H(144): error C2146: syntax error: missing ';' before identifier 'dwStructSize'
c: \program files (x86)\microsoft sdks\windows\v7.0a\include\winhttp. H(144): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
c: \program files (x86)\microsoft sdks\windows\v7.0a\include\winhttp. H(144): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
c: \program files (x86)\microsoft sdks\windows\v7.0a\include\winhttp. H(145): error C2146: syntax error: missing ';' before identifier 'lpszScheme'
现在我有另一个问题。这是我的代码：
#include <windows.h>
#include <winhttp.h>
#include <stdio.h>
#include <iostream>
using namespace std;
#include <string.h>
int main()
{
DWORD dwSize = 0;
DWORD dwDownloaded = 0;
LPBYTE pszOutBuffer;
BOOL bResults = FALSE;
HINTERNET hSession = NULL, hConnect = NULL, hRequest = NULL;
// Use WinHttpOpen to obtain a session handle.
hSession = WinHttpOpen( L"Internet Explorer example",
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.my-new-gadget.com",
INTERNET_DEFAULT_HTTPS_PORT, 0 );
// Create an HTTP request handle.
if( hConnect )
hRequest = WinHttpOpenRequest( hConnect, L"GET", L"index.php",
NULL, WINHTTP_NO_REFERER,
NULL, NULL);
// 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 );
HANDLE hFile = CreateFile("D:\\index.php", GENERIC_READ|GENERIC_WRITE, FILE_SHARE_READ, NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
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 byte[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);
DWORD wmWritten;
bool fr = WriteFile(hFile, pszOutBuffer, dwSize, &wmWritten, NULL);
int n = GetLastError();
}
// Free the memory allocated to the buffer.
delete [] pszOutBuffer;
}
} while (dwSize>0);
}
CloseHandle(hFile);
// 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 0;
}
输出是：
------ Build started: Project: a, Configuration: Debug Win32 ------
a.cpp
c:\users\admin\documents\visual studio 2010\projects\a\a\a.cpp(73): warning C4800: 'BOOL' : forcing value to bool 'true' or 'false' (performance warning)
a.obj : error LNK2019: unresolved external symbol __imp__WinHttpCloseHandle@4 referenced in function _main
a.obj : error LNK2019: unresolved external symbol __imp__WinHttpReadData@16 referenced in function _main
a.obj : error LNK2019: unresolved external symbol __imp__WinHttpQueryDataAvailable@8 referenced in function _main
a.obj : error LNK2019: unresolved external symbol __imp__WinHttpReceiveResponse@8 referenced in function _main
a.obj : error LNK2019: unresolved external symbol __imp__WinHttpSendRequest@28 referenced in function _main
a.obj : error LNK2019: unresolved external symbol __imp__WinHttpOpenRequest@28 referenced in function _main
a.obj : error LNK2019: unresolved external symbol __imp__WinHttpConnect@16 referenced in function _main
a.obj : error LNK2019: unresolved external symbol __imp__WinHttpOpen@20 referenced in function _main
MSVCRTD.lib(crtexew.obj) : error LNK2019: unresolved external symbol _WinMain@16 referenced in function ___tmainCRTStartup
c:\users\admin\documents\visual studio 2010\Projects\a\Debug\a.exe : fatal error LNK1120: 9 unresolved externals
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
现在可能出现什么问题？我正在尝试2天制作一个程序来从给定的URL下载文件。这让我疯狂！请帮帮我！
答案 0 :(得分：9)
在#include <windows.h>之前添加#include <winhttp.h>。