Support Board

#include <windows.h>
#include <iostream>

typedef float(*HelloWorldFunction)(float);

int main() {
// Load the DLL
HMODULE hDLL = LoadLibraryExW(L"C:\\SierraChart\\vlk\\DLLvlkfunctions.dll", NULL, LOAD_WITH_ALTERED_SEARCH_PATH);


if (hDLL == NULL) {
std::cout << "Failed to load DLL. Error code: " << GetLastError() << std::endl;
return 1;
}

// Get the hello_world function address
HelloWorldFunction helloWorld = reinterpret_cast<HelloWorldFunction>(GetProcAddress(hDLL, "hello_world"));
if (helloWorld == NULL) {
std::cout << "Failed to get function address. Error code: " << GetLastError() << std::endl;
FreeLibrary(hDLL);
return 1;
}

// Call the hello_world function
float result = helloWorld(5.0f);
std::cout << "Result: " << result << std::endl;

// Free the DLL module
FreeLibrary(hDLL);
return 0;
}

typedef float(*HelloWorldFunction)(float);

...
struct pDllWrapper
...
HMODULE hDLL = LoadLibraryExW(L"C:\\SierraChart\\vlk\\DLLvlkfunctions.dll", NULL, LOAD_WITH_ALTERED_SEARCH_PATH);

if (hDLL == NULL)
{
SCString LogMessage;
LogMessage.Format("pDW Failed to load DLL. Error code: %lu", GetLastError());
sendDebugOnce(sc, LogMessage, r_lastDebugString_);
throw std::runtime_error("pDW Failed to load DLL");
}

// Get the hello_world function address
helloWorld = reinterpret_cast<HelloWorldFunction>(GetProcAddress(hDLL, "hello_world"));
if (helloWorld == NULL)
{
SCString LogMessage;
LogMessage.Format("pDW Failed to get function address. Error code: %lu", GetLastError());
sendDebugOnce(sc, LogMessage, r_lastDebugString_);
FreeLibrary(hDLL);
throw std::runtime_error("pDW Failed to get function address");
}

float callHelloWorld(float num) {
// Call the hello_world function
return helloWorld(num);
}

bool runHelloWorld(SCStudyInterfaceRef& sc, SCInputRef& Input_showmessag, float num, float& result) {

try {
result = callHelloWorld(num);
if (Input_showmessag.GetYesNo()) { // Check if debug messages should be shown
SCString LogMessage;
LogMessage.Format("pDW Result: %f", result);
sendDebugOnce(sc, LogMessage, r_lastDebugString_);
}
return true; // Indicate success
} catch (std::runtime_error& e) {
SCString LogMessage;
LogMessage.Format("pDW Exception: %s", e.what());
sendDebugOnce(sc, LogMessage, r_lastDebugString_);
return false; // Indicate failure
}

}
...

inside scsf_dllCallTest...
if (sc.Index == 0)
{
// pointer initialization

pDW = reinterpret_cast<pDllWrapper*>(sc.GetPersistentPointer(pDllWrapper_pkey));

// assign persistent pointer to pDllWrapper struct
if (pDW == nullptr)
sc.SetPersistentPointer(pDllWrapper_pkey, new pDllWrapper(sc, r_lastDebugString));

}

// Use the pDW
float result;
if (!pDW->runHelloWorld(sc, Input_show_debug, 5.0f, result)) {
// Handle error case
SCString LogMessage;
LogMessage.Format("!!!ERROR =%d.", sc.Index);
sendDebugOnce(sc, LogMessage, r_lastDebugString);
} else {
// Use result
if (Input_show_debug.GetYesNo() ){
SCString LogMessage;
LogMessage.Format("Sending message 1x =%d. pdw input: %f, result:%f ", sc.Index, 5.0f, result);
sendDebugOnce(sc, LogMessage, r_lastDebugString);
}
}