恐怕你将不能够直接从CAPL脚本做到这一点。
我通常创建一个CAPL-DLL并将其包含在我的CANoe项目中,当我需要访问某些操作系统级功能时。尽管我主要使用它来访问外部设备(例如USB)或使用本地主机上的套接字与另一个程序进行交互,但其原理是相同的。
您可以通过示例在CANoe的文档中找到更多信息,但CANoe示例中提供的CAPL-DLL源代码有点难以理解。
我试图去掉下面的代码示例中的一些“不必要的”部分;这个例子将创建一个CAPL-DLL,它“公开”multiplyBy10
函数,基本上允许你从你的CAPL脚本中调用multiplyBy10
:
#define USECDLL_FEATURE
#define _BUILDNODELAYERDLL
#pragma warning(disable : 4786)
#include "cdll.h"
#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <map>
char moduleName[_MAX_FNAME];
HINSTANCE moduleHandle;
unsigned int
CAPLEXPORT far CAPLPASCAL multiplyBy10 (unsigned char value)
{
unsigned int result = value * 10;
freopen("CONOUT$", "w", stdout);
std::cout << "multiplyBy10() - value: " << int(value) << ", result: " << result << std::endl;
return (result);
}
CAPL_DLL_INFO4 table[] =
{
{CDLL_VERSION_NAME, (CAPL_FARCALL)CDLL_VERSION, "", "", CAPL_DLL_CDECL, 0xABD, CDLL_EXPORT},
{"multiplyBy10", (CAPL_FARCALL)multiplyBy10, "CAPL_DLL", "This is a demo function", 'L', 1, "D", "", { "value"}},
{0, 0}
};
CAPLEXPORT CAPL_DLL_INFO4 far * caplDllTable4 = table;
bool
WINAPI DllMain(HINSTANCE handle, DWORD reason, void*)
{
static FILE * stream;
switch (reason)
{
case DLL_PROCESS_ATTACH:
{
moduleHandle = handle;
char path_buffer[_MAX_PATH];
DWORD result = GetModuleFileName(moduleHandle, path_buffer, _MAX_PATH);
char drive[_MAX_DRIVE];
char dir[_MAX_DIR];
char fname[_MAX_FNAME];
char ext[_MAX_EXT];
_splitpath_s(path_buffer, drive, dir, fname, ext);
strcpy_s(moduleName, fname);
AllocConsole();
freopen_s(&stream, "conout$", "w", stdout);
std::cout << "DLL_PROCESS_ATTACH" << std::endl;
return 1;
}
case DLL_PROCESS_DETACH:
{
std::cout << "DLL_PROCESS_DETACH" << std::endl;
FreeConsole();
fclose(stream);
return 1;
}
}
return 1;
}