CPPWebBrowser的PostData |
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axsoft
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CPPWebBrowser的PostData 作者:雨中漫步 http://www.chinabcb.com WideString URL = "http://www.mmmnn.com/maker/pass.asp";;
ParamString = "username=test&password=12345";
TVariant *PostData = new TVariant(ParamString);
CPPWebBrowser->Navigate(URL,0,0,PostData,0); 這樣是不行的,網頁收不到參數。
http://www.mmmnn.com/maker/pass.asp?username=test&password=12345
這樣是可以訪問的。 請問該如何設置PostData的值? 給你一個直接Post的函數
如:
WebPostData(CppWebBrowser1,"http://211.91.2.221/pass.asp";
,"test=333333&PassWord=343200"); 我試過,可以用 void __fastcall TForm1::WebPostData(TCppWebBrowser *CppWebBrowser, String sURL, String sPostData)
{
BSTR bstrHeaders = NULL;
TVariant vFlags = {0}, vTargetFrameName={0}, vPostData={0}, vHeaders={0};
LPSAFEARRAY psa;
LPCTSTR cszPostData = sPostData.c_str();
UINT cElems = lstrlen(cszPostData);
LPSTR pPostData;
LPVARIANT pvPostData; bstrHeaders = SysAllocString(L"Content-Type: application/x-www-form-urlencodedrn");
if (!bstrHeaders){
Application->MessageBox("Could not allocate bstrHeaders", "Warning", MB_OK | MB_ICONWARNING);
return;
} V_VT(&vHeaders) = VT_BSTR;
V_BSTR(&vHeaders) = bstrHeaders; pvPostData = vPostData; if(pvPostData){
VariantInit(pvPostData); psa = SafeArrayCreateVector(VT_UI1, 0, cElems);
if(!psa){
return;
} SafeArrayAccessData(psa, (LPVOID*)&pPostData);
memcpy(pPostData, cszPostData, cElems);
SafeArrayUnaccessData(psa); V_VT(pvPostData) = VT_ARRAY | VT_UI1;
V_ARRAY(pvPostData) = psa;
} CppWebBrowser->Navigate((TVariant)sURL, &vFlags, &vTargetFrameName, &vPostData, &vHeaders);
} How to post data using TCppWebBrowser in C++Builder (轉www.borland.com) Abstract:This article demonstrates techniques for using the CppWebBrowser component to browse and post data using Navigate and Navigate2 methods. By Adam Vieweger. I had been tearing my hair out for more than two weeks. I wanted to use the TCppWebBrowser component (distributed with Borland C++Builder starting with BCB 5 Enterprise Edition) to create an app that would browse the Web and allow users to post data to Web pages. I was having a tough time of it because the documentation on TCppWebBrowser is fairly sparse and there aren't many articles out there to guide me. So I rolled up my sleeves and started working. I hope my discoveries prove useful to you. Browsing with CppWebBrowser turned out to be fairly simple. There are two methods that provide browsing capabilities: Navigate and Navigate2: CppWebBrowser1->Navigate("http://www.inprise.com";)
Navigate2 is extension of Navigate, but practically it does not matter for us -- in this article we can use both of them interchangeably. Should you want to find more information about WebBrowser component properties, methods, and events, please refer to online MSDN library: http://msdn.microsoft.com/library/default.asp?url=/workshop/browser/webbrowser/reference/Objects/WebBrowser.asp HARDER PROBLEMS
Posting data proved to be a tougher nut to crack. Microsoft's component requires data to be passed in a SAFEARRAY structure. The problem is that all Navigate2 parameters are TVariant type. I needed to convert between SAFEARRAY and TVariant. That's where the Borland Community site came in handy. I found a great tutorial on how to use SAFEARRAYs with C++Builder. For further details please refer to SAFEARRAYs made easier. The following code demonstrates the results of my research. Navigate requires that the TVariant should be of type VB_ARRAY and that it should point to a SAFEARRAY. The SAFEARRAY should be of element type VT_UI1 (an unsigned int), dimension one, and it should have an element count equal to the number of bytes of data to be posted. Confused? Take a look at the code and everything should be much clearer: // *Method 1*
TVariant vtEmpty;
TVariant vtPostDataArray;
char *str = "action=LogMeIn&username=MyName&password=MyPass"; SAFEARRAY FAR *psa = NULL;
SAFEARRAYBOUND sabound[48];
sabound[0].cElements = strlen(str);
sabound[0].lLbound = 0;
psa = SafeArrayCreate(VT_UI1, 1, sabound);
for(unsigned int n = 0; n < strlen(str); n++){
SafeArrayPutElement(psa, (long*)0, (void*)str[n]);
} vtEmpty.vt = VT_EMPTY;
vtPostDataArray.vt = VT_ARRAY;
vtPostDataArray.SetSAFEARRAY(psa);
// or vtPostDataArray=psa; TVariant vAddress = {"http://my.server/test/postresults.asp";};
CppWebBrowser1->Navigate2(&vAddress, &vtEmpty, &vtEmpty, &vtPostDataArray, &vtEmpty);
SafeArrayDestroy(psa); // *Method 2*
TVariant vtEmpty;
char *str = "acti 網路志工聯盟----Visita網站http://www.vista.org.tw
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avex
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xfile
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引言: 這篇文章好像尾巴斷了, 不完整, 可否請原作者補齊.... 謝謝~~ |
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