Reading an embedded Visual Studio C ++ text file resource
Here are the steps I took to add a text file as a resource: 1. Right click on the project, add a new item 2. Select the text file, click Add. 3. Go to project properties, configuration properties-> Linker-> Input-> Embed Managed Resource File 4. Then I added the text file "items.txt in this text box
Then in my .rc file I put the following code:
#include "resource.h"
IDR_DATA1 TEXTFILE "Items.txt"
In my resource.h file, I'll put:
#define TEXTFILE 256
#define IDR_DATA1 255
In my form1.cpp method:
std::string result;
char* data = NULL;
HINSTANCE hInst = GetModuleHandle(NULL);
HRSRC hRes = FindResource(hInst, MAKEINTRESOURCE(IDR_DATA1), MAKEINTRESOURCE(TEXTFILE));
if (NULL != hRes)
{
HGLOBAL hData = LoadResource(hInst, hRes);
if (hData)
{
DWORD dataSize = SizeofResource(hInst, hRes);
data = (char*)LockResource(hData);
}
else
{
MessageBox::Show("hData is null");
return "";
}
char* pkcSearchResult = strstr(data, "2000000");
if (pkcSearchResult != NULL)
MessageBox::Show(gcnew String(pkcSearchResult));
}
else
MessageBox::Show("hRes is null");
return result;
I keep getting hRes null no matter what, for some reason FindResource doesn't find Items.txt, although I added it as a resource using the steps above, does anyone know why FindResource () is not working? Btw it compiles without error and the above code is in a method that should return a string of text containing "2000000" (which I change for testing purposes)
source to share
It seems that the change in provisions MAKEINTRESOURCE(IDR_DATA1)
and MAKEINTRESOURCE(TEXTFILE)
in the above functions FindResource
will work.
The way it works in the following wide char is bypasses steps 1-4 as described above and follows from @In Silico:
- Make sure the text file is ANSI or Unicode depending on the requirement ( UTF-8 , etc. requires additional conversion)
- Copy the text file to your project directory
-
As said, add the following instructions to the rc and resource.h project respectively:
#include "resource.h" IDR_DATA1 TEXTFILE "Items.txt"
For "Items.txt" in some subdirectory of $ (ProjectDir), escaping backslashes also works the full path, but cannot be portable.
#define TEXTFILE 256 #define IDR_DATA1 255
And define two functions:
void LoadFileInResource(int name, int type, DWORD& size, const wchar_t *& data) // *& is passing the pointer by reference and not by val.
{
HMODULE handle = ::GetModuleHandleW(NULL);
HRSRC rc = ::FindResourceW(handle, MAKEINTRESOURCEW(name), MAKEINTRESOURCEW(type));
HGLOBAL rcData = ::LoadResource(handle, rc);
size = ::SizeofResource(handle, rc);
data = static_cast<const wchar_t*>(::LockResource(rcData));
//LockResource does not actually lock memory; it is just used to obtain a pointer to the memory containing the resource data.
}
wchar_t GetResource()
{
DWORD size = 0;
const wchar_t* data = NULL;
LoadFileInResource(IDR_MYTEXTFILE, TEXTFILE, size, data);
/* Access bytes in data - here a simple example involving text output*/
// The text stored in the resource might not be NULL terminated.
wchar_t* buffer = new wchar_t[size + 1];
::memcpy(buffer, data, size);
buffer[size] = 0; // NULL terminator
delete[] buffer;
return *data;
}
data
should provide a large scale implementation of the above pkcSearch request.
source to share