[Solved] C++ weird error strstr [closed]

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Your GetTextureGroupName() function is of a std::string type. The std::strstr() function does not accept a std::string as a parameter. Use the string c_str() member function instead:

if (std::strstr(pMaterial->GetTextureGroupName().c_str(), "World textures")){
    pMaterial->ColorModulate(0.5, 0.5, 0.5);
}

Rather than falling back to C style strings you should explore the std::string facilities as pointed out in the comments. The modified example uses the std::string::find member function:

if (pMaterial->GetTextureGroupName().find("World textures")!= std::string::npos){
    pMaterial->ColorModulate(0.5, 0.5, 0.5);
}

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solved C++ weird error strstr [closed]