如何将参数传递给dll？ [英] How to pass parameters to dll?

问题描述

我在DLL中具有此功能：

I have this function in DLL:

CPPLIBRARY_API int fnCPPLibrary(int a, int b)
{
    return a + b;
}

主要功能：

int main(){
    FARPROC myCppProc;
    HINSTANCE hDll;
    DWORD L;
    int result;

    hDll = LoadLibrary("CPPLibrary");

    if (hDll != NULL){
        myCppProc = GetProcAddress(hDll, "fnCPPLibrary");

        if (myCppProc != NULL){
            result = myCppProc();
        cout <<"Result from library: " <<result;
        int a;
        }
    }
}

在以下情况下，我可以轻松地调用fnCPPLibrary它没有参数，但是如何将参数从程序传递到该dll函数？是简单还是需要一些复杂的代码？

I can easly call fnCPPLibrary when it doesn't have arguments but how to pass params from program to that dll function? Is it simple or it requires some complicated code?

推荐答案

函数指针必须具有与所调用函数匹配的签名。

The function pointer must have a signature that matches the function you're calling.

不知道什么 CPPLIBRARY_API 是：

typedef int (*DLLFunc)(int, int);
DLLFunc myCppProc;
//...
myCppProc = (DLLFunc)GetProcAddress(hDll, "fnCPPLibrary");  // Cast to function pointer
myCppProc(1, 2);  // call function

我不知道CPPLIBRARY_API包含什么，这可能很重要（可能是调用惯例-您必须发布此信息）。但是通常，这就是您声明函数指针并使用 GetProcAddress 的方式。

I don't know what the qualifier CPPLIBRARY_API consists of, and it may be important (could be a calling convention -- you have to post this information). But in general, this is how you declare a function pointer and use GetProcAddress.

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