Question

我有以下架构：
-1 c＃wcf web service
-1 c＃console应用程序
-1 c ++类库
-c。的Microsoft样本密钥存储提供商我想要做的是在该示例密钥存储提供程序中调用Web服务。我在c＃console应用程序中使用了一个带有方法的类来使用该Web服务并且工作得很好。我使用那个c ++类库作为c＃console应用程序的包装器好的，现在我在提供程序项目中创建了一个.h文件和.c文件，我尝试加载库类创建的dll，然后在提供程序的OpenKey函数中使用它。这个文件看起来像：
.h

#pragma once      
//Declare ITEM struct again (the same definition from dll sources)    
typedef struct {    
unsigned char* data;
unsigned int len;
} ITEM;


//Declare function pointers
typedef ITEM(*_fptr_callWS)   (char*, ITEM, char*); //pointer to a function 
with the following signature:  ITEM function_name (char* ,ITEM ,char* )
typedef void(*_fptr_freeITEM) (ITEM); //pointer to a function with the 
following signature: void function_name (ITEM )

                                      /*The ITEM returned is freed using 
freeItem(ITEM) function*/
ITEM callWS(char* myAlias, ITEM hash, char* myPassword);

/*This function deletes an item which was returned from callWS(...) 
function*/
void freeITEM(ITEM item);

.C

#include"dllWrapper.h"
#include <Windows.h>
#include <stdio.h>

ITEM callWS(char* myAlias, ITEM hash, char* myPassword)
{
ITEM signature;
signature.data = NULL;
signature.len = 0;

//Load DLL
HINSTANCE dllHandle = LoadLibraryA("serviceConsumerWrapper.dll");
if (!dllHandle)
{
    printf("Error loading serviceConsumerWrapper.dll\n");
    return signature;
}

//Get callWS function pointer from loaded DLL
_fptr_callWS fptrCallWS = (_fptr_callWS)GetProcAddress(dllHandle, "callWS");
if (!fptrCallWS)
{
    printf("Error loading callWS function pointer\n");
    return signature;
}

//call function callWS using function pointer
return fptrCallWS(myAlias, hash, myPassword);

}


void freeITEM(ITEM item)
{
//Load DLL
HINSTANCE dllHandle = LoadLibraryA("serviceConsumerWrapper.dll");
if (!dllHandle)
{
    printf("Error loading serviceConsumerWrapper.dll\n");
    return;
 }

//Get callWS function pointer from loaded DLL
_fptr_freeITEM fptrFreeItem = (_fptr_freeITEM)GetProcAddress(dllHandle, 
"freeITEM");
if (!fptrFreeItem)
{
    printf("Error loading freeITEM function pointer\n");
    return;
}

//call function freeITEM using function pointer
fptrFreeItem(item);

}

好的，现在我尝试在我的提供商中使用这些功能。我包括＆＃34; wrapper.h＆＃34;我尝试使用这些功能。我认出了它们，但我仍然遇到链接器错误。

Error   LNK1120 2 unresolved externals  provider    
E:\Licenta_2016_Urian\New_site\Debug\SampleKSP.dll  1   
Error   LNK2019 unresolved external symbol _callWS referenced in function 
_SampleKSPOpenKey@20    provider    C:\Program Files (x86)\Windows 
Kits\8.0\Cryptographic Provider Development 
Kit\Samples\KeyStorageProviderSample\CPP\Provider\SampleKSP.obj 1   
Error   LNK2019 unresolved external symbol _freeITEM referenced in function 
_SampleKSPOpenKey@20    provider    C:\Program Files (x86)\Windows 
Kits\8.0\Cryptographic Provider Development 
Kit\Samples\KeyStorageProviderSample\CPP\Provider\SampleKSP.obj 1

顺便说一下，我在该类库创建的dll上使用了dumpbin，它似乎正确地导出了函数。

如何从非托管c应用程序调用c＃Web服务

0 个答案: