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POFormatting a buffer with StringCbPrintf
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  1. POFormatting a buffer with StringCbPrintf
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    copied!<p>I am facing difficulty in how to format a buffer using StringCbPrintf, here what it should be an HTTP request:</p> <pre><code>char getExternalIpRequest[1200]; ZeroMemory(getExternalIpRequest, 1200); StringCbPrintf(getExternalIpRequest, 1200, "&lt;?xml version=\"1.0\"?&gt;" "&lt;SOAP-ENV:Envelope xmlns:SOAP-ENV=\"http://schemas.xmlsoap.org/soap/envelope/\" SOAP-ENV:encodingStyle=\"http://schemas.xmlsoap.org/soap/encoding/\"&gt;" "&lt;SOAP-ENV:Body&gt;" "&lt;m:AddPortMapping xmlns:m=\"urn:schemas-upnp-org:service:WANIPConnection:1\"&gt;" "&lt;NewRemoteHost xmlns:dt=\"urn:schemas-microsoft-com:datatypes\" dt:dt=\"string\"&gt;" "" "&lt;/NewRemoteHost&gt;" "&lt;NewExternalPort xmlns:dt=\"urn:schemas-microsoft-com:datatypes\" dt:dt=\"ui2\"&gt;" "%s" "&lt;/NewExternalPort&gt;" "&lt;NewProtocol xmlns:dt=\"urn:schemas-microsoft-com:datatypes\" dt:dt=\"string\"&gt;" "%s" "&lt;/NewProtocol&gt;" "&lt;NewInternalPort xmlns:dt=\"urn:schemas-microsoft-com:datatypes\" dt:dt=\"ui2\"&gt;" "%s" "&lt;/NewInternalPort&gt;" "&lt;NewInternalClient xmlns:dt=\"urn:schemas-microsoft-com:datatypes\" dt:dt=\"string\"&gt;" "%s" "&lt;/NewInternalClient&gt;" "&lt;NewEnabled xmlns:dt=\"urn:schemas-microsoft-com:datatypes\" dt:dt=\"boolean\"&gt;" "1" "&lt;/NewEnabled&gt;" "&lt;NewPortMappingDescription xmlns:dt=\"urn:schemas-microsoft-com:datatypes\" dt:dt=\"string\"&gt;" "%s" "&lt;/NewPortMappingDescription&gt;" "&lt;NewLeaseDuration xmlns:dt=\"urn:schemas-microsoft-com:datatypes\" dt:dt=\"ui4\"&gt;" "0" "&lt;/NewLeaseDuration&gt;" "&lt;/m:AddPortMapping&gt;" "&lt;/SOAP-ENV:Body&gt;" "&lt;/SOAP-ENV:Envelope&gt;\r\n\r\n", externalPort, protocol, internalPort, internalp, entryDescription); // externalPort, protocol, internalPort, internalp, entryDescription are **char*** type. char getExternalIpRequestHeader[1500]; ZeroMemory(getExternalIpRequestHeader, 1500); StringCbPrintf(getExternalIpRequestHeader, 1500, "POST /UD/?3 HTTP/1.1\r\n" "Content-Type: text/xml; charset=\"utf-8\"\r\n" "SOAPAction: \"urn:schemas-upnp-org:service:WANIPConnection:1#GetExternalIPAddress\"\r\n" "User-Agent: Mozilla/4.0 (compatible; UPnP/1.0; Windows 9x)\r\n" "Host: %s\r\n" "Content-Length: %s\r\n" "Connection: Keep-Alive\r\n" "Cache-Control: no-cache\r\n" "Pragma: no-cache\r\n\r\n", upnpDeviceIp, strlen(getExternalIpRequest)); </code></pre> <p>But when I echo it in console I receive access violation message.</p> <p><strong>UPDATE</strong> I noticed if I comment one of StringCbPrintf(getExternalIpRequest) or StringCbPrintf(getExternalIpRequestHeader) there will e no crash.</p>
 

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