CPPWebBrowser的PostData
作者 佚名技术
来源 程序设计
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发布时间 2012-06-29
| ck. 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); |
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