FormatMessage

Bonjour,
J'essaie d'appeler FormatMessage sous visual studio C++ 2008 en Windows forms donc en C++ "managé".
Mon code est celui-c mais ne compile pas: voir Error dans les commentaires du code
============================================================
#include "StdAfx.h"
#include <windows.h>
#include <tchar.h>
#include <strsafe.h>
#include "Constants.h"
#include "manageDateFile.h"
#using <mscorlib.dll>
#using <System.dll>
using namespace System::Diagnostics ;
using namespace System::Text;
using namespace System::Collections;
using namespace System::Runtime::InteropServices;

[DllImport("kernel32.dll", CharSet=System::Runtime::InteropServices::CharSet::Auto)]
int FormatMessage(int dwFlags,
  IntPtr *lpSource,
  int dwMessageId,
  StringBuilder lpBuffer,
  int dwLanguageId,
  int nSize,
  IntPtr *Arguments);


// Constructor
manageDateFile::manageDateFile(bool _fDebug){
fDebug = _fDebug;
}

// Show the mesage for last Error error
void manageDateFile::showLE(String^ lpszFunction, DWORD dw)
{
// Retrieve the system error messa ge for the last-error code

int messageSize  = 255;
    String^ lpMsgBuf = "";
    int dwFlags = FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS;

    IntPtr ptrlpSource  = IntPtr::Zero;
    IntPtr prtArguments = IntPtr::Zero;

    int retVal = FormatMessage(
dwFlags,
&ptrlpSource,
dw,
0,
&lpMsgBuf,
messageSize,
&prtArguments);  //<-----Error 1 error C2665: 'FormatMessage' : none of the 2 overloads could convert all the argument types v:\dev\cpp\ChgDate\ChgDate\manageDateFile.cpp 48 ChgDate


/*

    // Display the error message
// Manage
String^ dispMsg;
StringCchPrintf((LPTSTR)lpDisplayBuf,
        LocalSize(lpDisplayBuf) / sizeof(TCHAR),
        TEXT("%s failed with error %d: %s"),
        lpszFunction, dw, lpMsgBuf);
    Debug::WriteLine((LPCTSTR)lpDisplayBuf);

    LocalFree(lpMsgBuf);
*/
}

============================================================

Avez vous un exemple qui fonctionne?
Merci par avance.

Salut,

Peut être le StringBuilder/String^ ?

Aide sur le pinvoke de FormatMessage. Ils proposent une alternative d'ailleurs.

Bonjour,
J'ai finalement trouvé une solution
La voici:
#include "StdAfx.h"
#include <windows.h>
#include <tchar.h>
#include <strsafe.h>
#include "Constants.h"
#include "manageDateFile.h"
#using <mscorlib.dll>
#using <System.dll>
using namespace System::Diagnostics ;
using namespace System::Text;
using namespace System::Collections;
using namespace System;
using namespace System::Runtime::InteropServices;

// Fonctionne
[DllImport("kernel32.dll", CharSet=System::Runtime::InteropServices::CharSet::Auto)]
int LocalFree(System::IntPtr
);
                        [DllImport("user32.dll", CharSet=System::Runtime::InteropServices::CharSet::Auto)]
int MessageBox(IntPtr, StringBuilder^ text, String^ caption, unsigned int type);

[DllImport("kernel32.dll", CharSet=System::Runtime::InteropServices::CharSet::Auto)]
int FormatMessage(
                    int        dwFlags,
                    System::IntPtr* lpSource,
                    int        dwMessageId,
                    int        dwLanguageId,
                    System::IntPtr* lpMsgBuf,
                    int        nSize,
                    System::IntPtr);

// Constructor
manageDateFile::manageDateFile(bool _fDebug){
    fDebug = _fDebug;
}
// Show the mesage for last Error error
void manageDateFile::showLE(String^ myMessage, DWORD dw)
{
    // Retrieve the system error message for the last-error code
    IntPtr lpMsgBuf      = IntPtr::Zero;
    IntPtr ptrlpSource   = IntPtr::Zero;
    StringBuilder^ text  = gcnew StringBuilder;
  
    int retVal = FormatMessage(
        FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
        &ptrlpSource,
        dw,                // Message ID
        MAKELANGID(LANG_NEUTRAL,SUBLANG_NEUTRAL),                    // LANG
        &lpMsgBuf,
        255,
        IntPtr::Zero); // &prtArguments);
    String^ textMsg =System::Runtime::InteropServices::Marshal::PtrToStringAuto(lpMsgBuf);
    text->AppendFormat("sys message = {0}, Code = {1}, in {2]", textMsg, dw, myMessage);
        MessageBox(IntPtr::Zero, text, "SYSTEM ERROR",  1);
        // Free the pointer
    LocalFree(lpMsgBuf);
}