如何在VC6.0中使用winhttp.h

手头一个项目，需要在VC6.0中，直接使用winhttp.h。但是，在工程中加入代码后，编译出错：

fatal error C1083: Cannot open include file: 'winhttp.h': No such file or directory。

在网上找到资料，解决了此问题。现把解决过程贴出：

一、下载并安装SDK

最后一个支持VC6的SDK:Platform SDK February 2003：

http://www.microsoft.com/msdownload/platformsdk/sdkupdate/psdk-full.htm

上面的页面已经打不开了，不过下面的文件仍然能下载。链接如下：

http://download.microsoft.com/download/platformsdk/sdk/update/win98mexp/en-us/3790.0/FULL/PSDK-FULL.1.cab
http://download.microsoft.com/download/platformsdk/sdk/update/win98mexp/en-us/3790.0/FULL/PSDK-FULL.2.cab
http://download.microsoft.com/download/platformsdk/sdk/update/win98mexp/en-us/3790.0/FULL/PSDK-FULL.3.cab
http://download.microsoft.com/download/platformsdk/sdk/update/win98mexp/en-us/3790.0/FULL/PSDK-FULL.4.cab
http://download.microsoft.com/download/platformsdk/sdk/update/win98mexp/en-us/3790.0/FULL/PSDK-FULL.5.cab
http://download.microsoft.com/download/platformsdk/sdk/update/win98mexp/en-us/3790.0/FULL/PSDK-FULL.6.cab
http://download.microsoft.com/download/platformsdk/sdk/update/win98mexp/en-us/3790.0/FULL/PSDK-FULL.7.cab
http://download.microsoft.com/download/platformsdk/sdk/update/win98mexp/en-us/3790.0/FULL/PSDK-FULL.8.cab
http://download.microsoft.com/download/platformsdk/sdk/update/win98mexp/en-us/3790.0/FULL/PSDK-FULL.9.cab
http://download.microsoft.com/download/platformsdk/sdk/update/win98mexp/en-us/3790.0/FULL/PSDK-FULL.10.cab
http://download.microsoft.com/download/platformsdk/sdk/update/win98mexp/en-us/3790.0/FULL/PSDK-FULL.11.cab
http://download.microsoft.com/download/platformsdk/sdk/update/win98mexp/en-us/3790.0/FULL/PSDK-FULL.12.cab
http://download.microsoft.com/download/platformsdk/sdk/update/win98mexp/en-us/3790.0/FULL/PSDK-FULL.13.cab
http://download.microsoft.com/download/platformsdk/sdk/update/win98mexp/en-us/3790.0/FULL/PSDK-FULL.bat
http://download.microsoft.com/download/platformsdk/sdk/update/win98mexp/en-us/3790.0/FULL/Extract.exe

处理过程：

1. 下载后全部放在一个文件夹中。如d:\temp

2. 进入命令行方式，转到d:\temp

3. 输入PSDK-FULL d:\sdk，注意后面要给出解压到的文件夹（如 d:\sdk）。然后用窗口方式进入d:\sdk中，找到Setup就可以安装了。

二、设置SDK项目路径

如下图所示，添加Include目录，Lib目录。

当然，我们可以不用下载完整的SDK，而是直接使用SDK提供的winhttp.h和winhttp.lib。

将SDK中的winhttp.h和winhttp.lib加入工程中，我们发现还是会产生编译错误：

error C2146: syntax error : missing ';' before identifier 'dwResult'
error C2501: 'DWORD_PTR' : missing storage-class or type specifiers
error C2501: 'dwResult' : missing storage-class or type specifiers
error C2061: syntax error : identifier 'DWORD_PTR'
error C2061: syntax error : identifier 'DWORD_PTR'
error C2061: syntax error : identifier 'DWORD_PTR'

这是因为类型DWORD_PTR不识别。没关系，我们在winhttp.h中，把DWORD_PTR重定义为DWORD就可以了。为方便以后使用，我上传了一个可用的winhttp包（不知道怎么在博客中上传文件，只好放在CSDN的下载资源里）。下载链接为：

http://download.csdn.net/detail/zwz1984/5094712