string class help needed

[CHYGO]

i ues string class in a Win32 Console Application(build by VC++ 6),here is the code and errors, how can i fix it?

#include "stdafx.h"

//add
#include <windows.h>
#include <stdio.h>
#include <tchar.h>
#include "Psapi.h"
#include <iostream.h>
#include <string>
using namespace std;

void PrintProcessNameAndID( DWORD processID )
{
string szProcessName;

// Get a handle to the process.

HANDLE hProcess = OpenProcess( PROCESS\_QUERY\_INFORMATION |
                               PROCESS\_VM\_READ,
                               FALSE, processID );

// Get the process name.

if (NULL != hProcess )
{
    HMODULE hMod;
    DWORD cbNeeded;

    if ( EnumProcessModules( hProcess, &hMod, sizeof(hMod), 
         &cbNeeded) )
    {
		int len = lstrlen(szProcessName);
        GetModuleBaseName( hProcess, hMod, szProcessName, 
                           len);
		//theProName = szProcessName;
    }

if(lstrcmp(szProcessName, "smss.exe"))
	\_tprintf( TEXT("%s  (PID: %u)\\n"), szProcessName, processID );
}

CloseHandle( hProcess );

}

int main(int argc, char* argv[])
{
...
return 0;
}

errors: ... : error C2664: 'lstrlenA' : cannot convert parameter 1 from 'class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >' to 'const char *' No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called ... : error C2664: 'GetModuleBaseNameA' : cannot convert parameter 3 from 'class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >' to 'char *' No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called ... : error C2664: 'lstrcmpA' : cannot convert parameter 1 from 'class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >' to 'const char *' No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called

i 've tried ,then i have no regret

[Naveen]

Trying using szProcessName.c_str() instead of only "szProcessName" in the functions 'lstrlenA' , 'GetModuleBaseNameA' and 'lstrcmpA'.

nave [OpenedFileFinder] [My Blog]

[CHYGO]

Thank u,Naveen.I did as u told me ,but comes a new error: ...:error C2664: 'GetModuleBaseNameA' : cannot convert parameter 3 from 'const char *' to 'char *' how to do?

i 've tried ,then i have no regret

[CHYGO]

oh yea.. haha i must be looking like a fool now... i fix it thanks for yr help :)

i 've tried ,then i have no regret

[Naveen]

hmm.. I modified you code a little.Just changed the szProcessName to TCHAR.

void PrintProcessNameAndID( DWORD processID )
{
TCHAR szProcessName[MAX_PATH];
// Get a handle to the process.
HANDLE hProcess = OpenProcess( PROCESS_QUERY_INFORMATION |
PROCESS_VM_READ,
FALSE, processID );
// Get the process name.
if (NULL != hProcess )
{
HMODULE hMod;
DWORD cbNeeded;

    if ( EnumProcessModules( hProcess, &hMod, sizeof(hMod), 
         &cbNeeded) )
    {
        GetModuleBaseName( hProcess, hMod, szProcessName, 
                                                   MAX\_PATH);
    }
    if(lstrcmp(szProcessName, "smss.exe"))
	\_tprintf( TEXT("%s  (PID: %u)\\n"), szProcessName, processID );
}

CloseHandle( hProcess );

}

nave [OpenedFileFinder] [My Blog]

[CHYGO]

thanks for ue help nave, but yr code still have a little problem:)

if(lstrcmp(szProcessName, "smss.exe"))
_tprintf( TEXT("%s (PID: %u)\n"), szProcessName, processID );

that is: function lstrcmp(lpstring1, lpstring2),when lpstring1 equals lpstring2,the return value is zero.so if i need only see "smss.exe" on the screen,i should change it like this

if(!lstrcmp(szProcessName, "smss.exe"))
_tprintf( TEXT("%s (PID: %u)\n"), szProcessName, processID );

i 've tried ,then i have no regret

[David Crow]

CHYGO wrote:

if(!lstrcmp(szProcessName, "smss.exe"))

lstrcmp() is not a boolean function so you should refrain from treating it as such:

if (lstrcmp(szProcessName.c_str(), "smss.exe") == 0)
...

Also, since szProcessName is a string variable, why not just use:

if (szProcessName != "smss.exe")
...

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