HttpOpenRequest总是不成功，请高手指点
InternetOpen和InternetConnect都能正确提供句柄
HttpOpenRequest总是返回0

Function ulong HttpOpenRequest (ulong hConnect,ref string lpszVerb,ref string lpszObjectName,ref string lpszVersion,ref string lpszReferrer,ref string lplpszAcceptTypes[], ulong dwFlags,ref ulong dwContext) Library "WININET.DLL" Alias for "HttpOpenRequestA"


string lpszVerb
string lpszObjectName
string lpszVersion
string lpszReferrer
string lplpszAcceptTypes[]
ulong dwContext
lpszVerb="GET"
lpszObjectName="upfile/200621714544982086.jpg"
lpszVersion="HTTP/1.1"
SetNull(lpszReferrer)
lplpszAcceptTypes[]={""}
dwContext=2

iis5=HttpOpenRequest(iis3,lpszVerb,lpszObjectName,lpszVersion,lpszReferrer,lplpszAcceptTypes[],INTERNET_FLAG_RELOAD,dwContext)
敬请高手指点

[解决办法]
pb版本？
如果高于9，声明的后面需要改成

"HttpOpenRequestA;ansi"