Use format strings that contain %1, %2 etc. instead of %d, %s etc. - Linux, C++
- by rursw1
Hello,
As a follow-up of this question (Message compiler replacement in Linux gcc), I have the following problem:
When using MC.exe on Windows for compiling and generating messages, within the C++ code I call FormatMessage, which retrieves the message and uses the va_list *Arguments parameter to send the varied message arguments.
For example:
messages.mc file:
MessageId=1
Severity=Error
SymbolicName=MULTIPLE_MESSAGE_OCCURED
Language=English
message %1 occured %2 times.
.
C++ code:
void GetMsg(unsigned int errCode, wstring& message,unsigned int paramNumber, ...)
{
HLOCAL msg;
DWORD ret;
LANGID lang = GetUserDefaultLangID();
try
{
va_list argList;
va_start( argList, paramNumber );
const TCHAR* dll = L"MyDll.dll";
_hModule = GetModuleHandle(dll);
ret =::FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_HMODULE|FORMAT_MESSAGE_IGNORE_INSERTS,
_hModule,
errCode,
lang,
(LPTSTR) &msg,
0,
&argList );
if ( 0 != ret )
{
unsigned int count = 0 ;
message = msg;
if (paramNumber>0)
{
wstring::const_iterator iter;
for (iter = message.begin();iter!=message.end();iter++)
{
wchar_t xx = *iter;
if (xx ==L'%')
count++;
}
}
if ((count == paramNumber) && (count >0))
{
::LocalFree( msg );
ret =::FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_HMODULE,
_hModule,
errCode,
GetUserDefaultLangID(),
(LPTSTR) &msg,
0,
&argList );
}
else if (count != paramNumber)
{
wstringstream tmp;
wstring messNumber;
tmp << (errCode & 0xFFFF);
tmp >> messNumber;
message = message +L"("+ messNumber + L"). Bad Format String. ";
}
}
::LocalFree( msg );
}
catch (...)
{
message << L"last error: " << GetLastError();
}
va_end( argList );
}
Caller code:
wstring message;
GetMsg(MULTIPLE_MESSAGE_OCCURED, message,2, "Error message", 5);
Now, I wrote a simple script to generate a .msg file from the .mc file, and then I use gencat to generate a catalog from it.
But is there a way to use the formatted strings as they contain %1, %2, etc. and NOT the general (%d, %s...) format?
Please note, that the solution has to be generic enough for each possible message with each posible types\ arguments order...
Is it possible at all?
Thank you.
