Golang calling Windows DLL function with more than 18 arguments

[George Vanev]

I have an external 64 bit .DLL and I have to pass 22 arguments to one of the functions. Go (go1.16.4 windows/amd64) allows up to 18 arguments. Is there any workaround?

I've tried to make Syscall22 in dll_windows.go, link it with syscall_Syscall22 in src/runtime/syscall_windows.go and rebuilt: go install -a runtime. But it give me errors when trying to call the function

[Ian Lance Taylor]

On Thu, Jun 3, 2021 at 8:42 AM George Vanev <george...@gmail.com> wrote:
>
> I have an external 64 bit .DLL and I have to pass 22 arguments to one of the functions. Go (go1.16.4 windows/amd64) allows up to 18 arguments. Is there any workaround?
> I've tried to make Syscall22 in dll_windows.go, link it with syscall_Syscall22 in src/runtime/syscall_windows.go and rebuilt: go install -a runtime. But it give me errors when trying to call the function

There is currently no support for more than 18 arguments.

What is the function you are trying to call?

Ian

[George Vanev]

The function is from a Chinese  SDK and I don't have the source code:
int HDAPI Hd_Rt_SendRealTimeText(int nSendType, void *pStrParams, int nRealTimeAreaIndex, int nMaxPageCount, int nColor, int nGray, int nX, int nY, int nWidth, int nHeight,
void *pText, int nTextColor, int nBackGroupColor, int nStyle, void *pFontName, int nFontHeight, int nShowEffect, int nShowSpeed,int nStayTime, int nLiveTime,
int bSaveToFlash, void *pDeviceGUID);

[Ian Lance Taylor]

On Thu, Jun 3, 2021 at 9:20 AM George Vanev <george...@gmail.com> wrote:
>
> The function is from a Chinese SDK and I don't have the source code:
> int HDAPI Hd_Rt_SendRealTimeText(int nSendType, void *pStrParams, int nRealTimeAreaIndex, int nMaxPageCount, int nColor, int nGray, int nX, int nY, int nWidth, int nHeight,
> void *pText, int nTextColor, int nBackGroupColor, int nStyle, void *pFontName, int nFontHeight, int nShowEffect, int nShowSpeed,int nStayTime, int nLiveTime,
> int bSaveToFlash, void *pDeviceGUID);

OK, well, that is fairly dreadful.

As far as I know the only workaround is to use cgo.

Please open an issue to ask for Syscall21 and Syscall24. Thanks.

Ian

> On Thursday, June 3, 2021 at 7:10:05 PM UTC+3 Ian Lance Taylor wrote:
>>
>> On Thu, Jun 3, 2021 at 8:42 AM George Vanev <george...@gmail.com> wrote:
>> >
>> > I have an external 64 bit .DLL and I have to pass 22 arguments to one of the functions. Go (go1.16.4 windows/amd64) allows up to 18 arguments. Is there any workaround?
>> > I've tried to make Syscall22 in dll_windows.go, link it with syscall_Syscall22 in src/runtime/syscall_windows.go and rebuilt: go install -a runtime. But it give me errors when trying to call the function
>>
>> There is currently no support for more than 18 arguments.
>>
>> What is the function you are trying to call?
>>
>> Ian
>

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