CODEWITHSUNDEEP
c++
Mr Bell
Mr Bell

Reputation: 9338

Convert integer to formatted LPCWSTR. C++

I have a direct3d project that uses D3DXCreateTextureFromFile() to load some images. This function takes a LPCWSTR for the path to file. I want to load a series of textures that are numbered consecutively (ie. MyImage0001.jpg, MyImage0002.jpg, etc) But c++'s crazy strings confuse me.

How do i:

for(int i=0; i < 3;i++)
{
//How do I convert i into a string path i can use with D3DXCreateTextureFromFile?
}

Edit:

I should mention I am using Visual Studio 2008's compiler

Upvotes: 4

Views: 9395

Answers (4)

Remy Lebeau
Remy Lebeau

Reputation: 596713

The Win32 API has multiple string formatting functions available, eg:

wsprintf():

WCHAR buffer[SomeMaxLengthHere];
for(int i=0; i < 3;i++)
{
    wsprintfW(buffer, L"%i", i);
    ...
}

StringCbPrintf():

WCHAR buffer[SomeMaxLengthHere];
for(int i=0; i < 3;i++)
{
    StringCbPrintfW(buffer, sizeof(buffer), L"%i", I);
    ...
}

StringCchPrintf():

WCHAR buffer[SomeMaxLengthHere];
for(int i=0; i < 3;i++)
{
    StringCchPrintfW(buffer, sizeof(buffer) / sizeof(WCHAR), L"%i", i);
    ...
}

Just to name a few.

Upvotes: 1

R Samuel Klatchko
R Samuel Klatchko

Reputation: 76541

One option is std::swprintf:

wchar_t buffer[256];
std::swprintf(buffer, sizeof(buffer) / sizeof(*buffer),
              L"MyImage%04d.jpg", i);

You could also use a std::wstringstream:

std::wstringstream ws;
ws << L"MyImage" << std::setw(4) << std::setfill(L'0') << i << L".jpg";
ws.str().c_str();  // get the underlying text array

Upvotes: 9

Preet Sangha
Preet Sangha

Reputation: 65516

wsprintf

/* wsprintf example */
#include <stdio.h>

int main ()
{
  wchar_t buffer [50];
  for(int i=0; i < 3;i++){
     wsprintf (buffer, L"File%d.jpg", i);
     // buffer now contains the file1.jpg, then file2.jpg etc
  }
  return 0;
}

Upvotes: 0

Brian R. Bondy
Brian R. Bondy

Reputation: 347336

The most 'C++' way would be to use wstringstream:

#include <sstream>

//...

std::wstringstream ss;
ss << 3;
LPCWSTR str = ss.str().c_str();

Upvotes: 3

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