如何在UPNP InvokeAction之后获得响应 [英] HOW Get Response after UPNP InvokeAction

问题描述

您好。  

我正在开发一个upnp客户端（控制点）。 

如下所示，我有一个问题，我无法得到回复关于upnp invokeactioin的价值。

 

 

 VARIANT vaDesElement; 
 VariantInit（& vaDesElement）; 
 
 BSTR bstrActionName = NULL; 
 bstrActionName = SysAllocString（L " GetMaxNum" ）; 
 
 pAppService-> AddRef（）; 
 hr = pAppService-> InvokeAction（bstrActionName，varActionArgs，& pvarOutActionArgs，& pvarRetVal）; 
 
  / * pvarOutActionArgs的值; 
 vt 0x200c unsigned short 
 + parray 0x0194b510 {cDims = 0x0001 fFeatures = 0x0800 cbElements = 0x00000010 ...} tagSAFEARRAY * 
 cDims 0x0001 unsigned short 
 fFeatures 0x0800 unsigned short 
 cbElements 0x00000010 unsigned long int 
 cLocks 0x00000000 unsigned long int 
 pvData 0x0194b530 {void *} void * 
  -  rgsabound 0x0194b520 {tagSAFEARRAYBOUND [1]} tagSAFEARRAYBOUND [1] 
 cElements 0x00000001 unsigned long int 
 lLbound 0x00000000 long int 
 * /  
 

解决方案

< p style ="margin：0in; font-family：Calibri; font-size：11pt"> Hello，

 

我无法在我的网站上重现您的问题，但是您获得了S_OK之后调用SafeArrayGetElement？您需要检查一些返回值，例如DISP_E_BADINDEX，在本文档中为
SafeArrayGetElement 。也许我们可以从返回值中获取错误消息。

 

最好的问候，

杰西

Hi.  

I'm developing a upnp client(control point). 

As follows, I have a problem that i cant get response value about upnp invokeactioin.

 

 

VARIANT vaDesElement;
VariantInit(&vaDesElement);

BSTR bstrActionName = NULL;
bstrActionName = SysAllocString(L"GetMaxNum");

pAppService->AddRef();
hr = pAppService->InvokeAction(bstrActionName, varActionArgs, &pvarOutActionArgs, &pvarRetVal);

/* values of pvarOutActionArgs;
		vt	0x200c	unsigned short
+		parray	0x0194b510 {cDims=0x0001 fFeatures=0x0800 cbElements=0x00000010 ...}	tagSAFEARRAY*
		cDims	0x0001	unsigned short
		fFeatures	0x0800	unsigned short
		cbElements	0x00000010	unsigned long int
		cLocks	0x00000000	unsigned long int
		pvData	0x0194b530 {void*}	void*
-		rgsabound	0x0194b520 {tagSAFEARRAYBOUND[1]}	tagSAFEARRAYBOUND[1]
			cElements	0x00000001	unsigned long int
			lLbound		0x00000000	long int
*/

解决方案

Hello,

 

I can not reproduce your issue on my site, but did you get S_OK after call SafeArrayGetElement? There are some return values you need to check like DISP_E_BADINDEX, in this document SafeArrayGetElement. Maybe we can get the error message from the return value.

 

Best regards,

Jesse

这篇关于如何在UPNP InvokeAction之后获得响应的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！