C++ code for URL-encoding but cannot use curl

Is there a simple way to do URL encode in C++?

I am using byte string encode and it give wrong result

SDKXML=<CSPInput><serviceID>CSOTR39099</serviceI开发者_JAVA百科D>&lt

<CSPInput> Instead of the correct format %3CCSPInput%3E

Will somthing like libcurl work for C++

Sample Request wrongly encoded:

GET /sdk/servlet/abc.servlet.SampleCredit?SDKXML=<CSPInput><serviceID>CSOTR39099</serviceID>&lt

<CSPInput> Instead of the correct format %3CCSPInput%3E

Could you please help and suggest where is the issue and propose the code to fix it.

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you can look at houdini

&lt seems to be html encode, not url encoding