im looking for a solution, that a DLL is not running on Excel 2016 32bit. I’ve tried so much in the recent weeks, that i have no idea left. I only get it running on Excel 64bit, I have two different DLL’s for that. I use Visual Studio 2022, but have also tried it to compile in VB 2017. I’m getting Runtime Error 453 “Cant find entry point in dll”. If i use the declatarion with the path “Private Declare Function crypt32 Lib “Pathcrypt32.dll” Alias “_crypt32@4″ (ByVal inputs As String) As String”, i get Runtime error 53 “Cant find file”.
Starting with the C++ Code:
C++ 64bit DLL:
#include "pch.h"
#include <Windows.h>
#include <OleAuto.h>
extern "C" __declspec(dllexport) BSTR crypt64(BSTR input) {
wchar_t output[2];
wchar_t inputChar = input[0];
if (inputChar >= L'A' && inputChar <= L'Z') {
inputChar = (inputChar - L'A' + 1) % 26 + L'A';
}
else if (inputChar >= L'a' && inputChar <= L'z') {
inputChar = (inputChar - L'a' + 1) % 26 + L'a';
}
switch (inputChar) {
case L'a': output[0] = L't'; break;
default: output[0] = inputChar; break;
}
output[1] = L'';
return SysAllocString(output);
}
extern "C" __declspec(dllexport) void FreeBSTR(BSTR bstr) {
SysFreeString(bstr);
}
C++ 32bit DLL:
#include "pch.h"
#include <Windows.h>
#include <OleAuto.h>
extern "C" __declspec(dllexport) BSTR __stdcall crypt32(BSTR input) {
wchar_t output[2];
wchar_t inputChar = input[0];
if (inputChar >= L'A' && inputChar <= L'Z') {
inputChar = (inputChar - L'A' + 1) % 26 + L'A';
}
else if (inputChar >= L'a' && inputChar <= L'z') {
inputChar = (inputChar - L'a' + 1) % 26 + L'a';
}
switch (inputChar) {
case L'a': output[0] = L't'; break;
default: output[0] = inputChar; break;
}
output[1] = L'';
return SysAllocString(output);
}
extern "C" __declspec(dllexport) void FreeBSTR(BSTR bstr) {
SysFreeString(bstr);
}
Its not the whole C++ Code, just testwise to make it work.
VBA Code:
Option Explicit
#If Win64 Then
Private Declare PtrSafe Function LoadLibrary Lib "kernel32" Alias "LoadLibraryA" (ByVal lpLibFileName As String) As Long
Private Declare PtrSafe Function crypt64 Lib "crypt64.dll" (ByVal inputs As String) As String
#Else
Private Declare Function LoadLibrary Lib "kernel32" Alias "LoadLibraryA" (ByVal lpLibFileName As String) As Long
Private Declare Function crypt32 Lib "crypt32.dll" Alias "_crypt32@4" (ByVal inputs As String) As String
#End If
Sub dllcheck(inputs As String)
Dim dllPath As String, hModule As Long
#If Win64 Then
dllPath = ThisWorkbook.Path & "Codecrypt64.dll"
#Else
dllPath = ThisWorkbook.Path & "Codecrypt32.dll"
#End If
hModule = LoadLibrary(dllPath)
If hModule = 0 Then
MsgBox "Error"
Exit Sub
Else
MsgBox "Connected to DLL"
End If
End Sub
Sub testconnect()
Dim result As String
#If Win64 Then
dllcheck ""
result = crypt64("5")
MsgBox result
#Else
dllcheck ""
result = crypt32("5")
MsgBox result
#End If
End Sub
Here is my Dumpbin:
ordinal hint RVA name
1 0 00011055 FreeBSTR
2 1 00011334 _crypt32@4
Thanks for reviewing.
Tried it without the __stdcall convention, tried to write a Header already, but couldnt get it started. I also used VBA Code that was directly linked to the path (Private Declare Function crypt32 Lib “Pathcrypt32.dll” Alias “_crypt32@4” (ByVal inputs As String) As String)
I don’t know why you need 2 functions or 2 files. Here’s a simplified version.
crypt.cpp (for current content, crypt.c would probably be a better name):
#include <Windows.h>
#include <OleAuto.h>
#define CRYPT_EXPORT_API __declspec(dllexport)
#if defined(__cplusplus)
extern "C" {
#endif
CRYPT_EXPORT_API BSTR crypt(const BSTR input);
CRYPT_EXPORT_API void freeBSTR(BSTR bstr);
#if defined(__cplusplus)
}
#endif
BSTR crypt(const BSTR input)
{
wchar_t output[2];
wchar_t i0 = input[0];
if ((i0 >= L'A') && (i0 <= L'Z')) {
i0 = (i0 - L'A' + 1) % 26 + L'A';
} else if ((i0 >= L'a') && (i0 <= L'z')) {
i0 = (i0 - L'a' + 1) % 26 + L'a';
}
switch (i0) {
case L'a':
output[0] = L't';
break;
default:
output[0] = i0;
break;
}
output[1] = L'';
return SysAllocString(output);
}
void freeBSTR(BSTR bstr)
{
SysFreeString(bstr);
}
Output (split in 2 parts for clarity):
-
Build:
[cfati@CFATI-5510-0:e:WorkDevStackExchangeStackOverflowq079122180]> sopr.bat ### Set shorter prompt to better fit when pasted in StackOverflow (or other) pages ### [prompt]> [prompt]> dir /b crypt.cpp [prompt]> :: Configure VS22 for 032bit [prompt]> "c:Installpc064MicrosoftVisualStudioCommunity2022VCAuxiliaryBuildvcvarsall.bat" x86 > nul [prompt]> [prompt]> cl /nologo /MD /DDLL crypt.cpp /link /NOLOGO /DLL /OUT:libcrypt32.dll OleAut32.lib crypt.cpp Creating library libcrypt32.lib and object libcrypt32.exp [prompt]> [prompt]> dir /b crypt.cpp crypt.obj libcrypt32.dll libcrypt32.exp libcrypt32.lib [prompt]> [prompt]> :: Configure VS22 for 064bit [prompt]> "c:Installpc064MicrosoftVisualStudioCommunity2022VCAuxiliaryBuildvcvarsall.bat" x64 > nul [prompt]> [prompt]> cl /nologo /MD /DDLL crypt.cpp /link /NOLOGO /DLL /OUT:libcrypt64.dll OleAut32.lib crypt.cpp Creating library libcrypt64.lib and object libcrypt64.exp [prompt]> [prompt]> dir /b crypt.cpp crypt.obj libcrypt32.dll libcrypt32.exp libcrypt32.lib libcrypt64.dll libcrypt64.exp libcrypt64.lib -
Test (same Cmd window):
[prompt]> :: ---------- Check the 064bit .dll ---------- [prompt]> :: Exports [prompt]> dumpbin /nologo /exports .libcrypt64.dll Dump of file .libcrypt64.dll File Type: DLL Section contains the following exports for libcrypt64.dll 00000000 characteristics FFFFFFFF time date stamp 0.00 version 1 ordinal base 2 number of functions 2 number of names ordinal hint RVA name 1 0 00001000 crypt 2 1 00001100 freeBSTR Summary 1000 .data 1000 .pdata 1000 .rdata 1000 .reloc 1000 .text [prompt]> [prompt]> :: Architecture [prompt]> dumpbin /headers .libcrypt64.dll | findstr "machine" 8664 machine (x64) [prompt]> [prompt]> :: ---------- Check the 032bit .dll ---------- [prompt]> :: Exports [prompt]> dumpbin /nologo /exports .libcrypt32.dll Dump of file .libcrypt32.dll File Type: DLL Section contains the following exports for libcrypt32.dll 00000000 characteristics FFFFFFFF time date stamp 0.00 version 1 ordinal base 2 number of functions 2 number of names ordinal hint RVA name 1 0 00001000 crypt 2 1 000010D0 freeBSTR Summary 1000 .data 1000 .rdata 1000 .reloc 2000 .text [prompt]> [prompt]> :: Architecture [prompt]> dumpbin /headers .libcrypt32.dll | findstr "machine" 14C machine (x86) 32 bit word machine
Same function name, so the VBA code could be cleaned by that 064bit / 032bit ugliness (only thing that differs is the .dll name).
Check:
-
[SO]: stdcall name mangling using extern c and dllexport vs module definitions (msvc++)
-
[SO]: Discover missing module using command-line (“DLL load failed” error) (@CristiFati’s answer) (not related, but might be interesting)
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