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Help with FindFirstFile

Hi group

I have just got the FindFirstFile function working in my small tutorial app,
the problem is that I can only seem to get it working when I hard code the
search string. I have defined a string str1 but I get a conversion error
when passing it to the function. Also when I attempt to print a string I
get a memory error: "Memory could not be read".

I have included the code below for you all to see, it is just a subset of
the code I am using.

I would be *very* grateful of any pointers you could provide me with to
fixing this problem.

Kind regards

Rich Strang

#define _WIN32_WINNT 0x0400
#include <windows.h>
#include <stdio.h>
#include <string>
using namespace std;

int main(int argc, char *argv[])
{
WIN32_FIND_DATA FindFileData;
HANDLE hFind;

string str1 = "main.cpp";

//printf ("Target file is %s.\n", str1);
hFind = FindFirstFile(s tr1, &FindFileDat a);
if (hFind == INVALID_HANDLE_ VALUE)
{
printf ("Invalid File Handle. GetLastError reports %d\n", GetLastError
());
return (0);
}
else
{
printf ("The first file found is %s\n", FindFileData.cF ileName);
FindClose(hFind );
return (1);
}
}
Jul 22 '05 #1
2 16136

"Rich Strang" <ri*******@hotm ail.com> wrote in message news:uy******** *************@n ews-text.cableinet. net...

string str1 = "main.cpp";
hFind = FindFirstFile(s tr1, &FindFileDat a);


FindFirstFile takes a const char* (or perhaps a const wchar_t*) not a string.
hFind = FindFirstFile(s tr1.c_str(), &FindFileDat a);
Jul 22 '05 #2

"Rich Strang" <ri*******@hotm ail.com> wrote in message
news:uy******** *************@n ews-text.cableinet. net...
Hi group

I have just got the FindFirstFile function working in my small tutorial app, the problem is that I can only seem to get it working when I hard code the
search string. I have defined a string str1 but I get a conversion error
when passing it to the function. Also when I attempt to print a string I
get a memory error: "Memory could not be read".

I have included the code below for you all to see, it is just a subset of
the code I am using.

I would be *very* grateful of any pointers you could provide me with to
fixing this problem.

Kind regards

Rich Strang

#define _WIN32_WINNT 0x0400
#include <windows.h>
#include <stdio.h>
#include <string>
using namespace std;

int main(int argc, char *argv[])
{
WIN32_FIND_DATA FindFileData;
HANDLE hFind;

string str1 = "main.cpp";

//printf ("Target file is %s.\n", str1);
hFind = FindFirstFile(s tr1, &FindFileDat a);
Try this:
printf ("Target file is %s.\n", str1.c_str());
hFind = FindFirstFile(s tr1.c_str(), &FindFileDat a);
if (hFind == INVALID_HANDLE_ VALUE)
{
printf ("Invalid File Handle. GetLastError reports %d\n", GetLastError
());
return (0);
}
else
{
printf ("The first file found is %s\n", FindFileData.cF ileName);
FindClose(hFind );
return (1);
}
}


Max.
Jul 22 '05 #3

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