The OpenGL-HQ patch is for SDL, not for DOSBox. Try -up1 instead of -u.
patch -up1 < openglhq-dosbox-for-sdl-202121117_msvc_gcc.patch

錯誤 1 error C2121: '#' : 無效的字元 : 可能是巨集展開的結果 e:\dosbox_ykhwong\src\dos\dos_network2.h 114 1 dosbox
錯誤 2 error C3861: 'L': 找不到識別項 e:\dosbox_ykhwong\src\dos\dos_network2.h 114 1 dosbox

As per discussion on PM messages, I finally end up with these
I am in doubt something has broken, but just unsure
don't get me wrong, I mean do you know how to resolve it?

1) Not effective pound sign
2) L not recognizable.

Just remove the line 114. It is only for debugging.

Still got problems

1namespace Util {
2std::string compress(const std::string& input) { //throw (SaveState::Error)
3	if (input.empty())
4		return input;
5
6	const uLong bufferSize = ::compressBound(input.size());

After Solving all link time errors, this message appears.
I had to add save_state.cpp to complete the compilation procedure.

錯誤 1 error C2039: 'compressBound' : 不是 '`global namespace'' 的成員 e:\dosbox_ykhwong\src\save_state.cpp 66 1 dosbox
錯誤 2 error C3861: 'compressBound': 找不到識別項 e:\dosbox_ykhwong\src\save_state.cpp 66 1 dosbox

1) compressBound is not a member of global namespace
2) can't find compressBound inside save_state.cpp

compressBound is part of zlib AFAIK. You didn't have the zlib installed yet?

zlib125dll
zlib-1.2.7.tar

I thought I didn't properly installed it. Which one is correct?
Thanks
Jack

Newer is better but you need the headers, too. Not just the dll

So the problem should be something else?
Thanks
Jack

You give no information of what you did in regards to zlib so how should we tell?

Dominus wrote:

You give no information of what you did in regards to zlib so how should we tell?

I unpacked it and put it into the dosbox directory, then include the directory in the project path like ..\zlib then in the library path like ..\zlib\dll32
Am I on the right track?
Thanks
Jack