ImageGear for C and C++ on Windows v20.3 - Updated
Tutorial: Create Your First Project
User Guide > Getting Started > Tutorial: Create Your First Project

In this tutorial, you will create a C/C++ Windows console application and use ImageGear to load an image, resize it, and convert it to a new raster format.

The following tutorial refers specifically to 64-bit installations. For 32-bit installations, throughout these instructions, substitute x64 with x86.

Using Visual Studio (2015 or later):

  1. Create a new "Win32 Console Application" project with name "IG_Tutorial_Console".
  2. Create a new solution platform for platform x64.
  3. Set the solution configuration to either "Debug|x64" or "Release|x64" and apply the following changes:
    1. Set Configuration Properties\General\Output Directory to the absolute path to the ImageGear binaries directory.
      e.g. [INSTALLDIR]\ImageGear for C and C++ vXX\Build\Bin\x64\
    2. Modify project setting Configuration Properties\C/C++\General\Additional Include Directories to include the absolute path to ImageGear header files directory.
      e.g. [INSTALLDIR]\ImageGear for C and C++ vXX\Build\Include
    3. Modify project setting Configuration Properties\Linker\General\Additional Library Directories to include the absolute path to ImageGear libraries directory.
      e.g. [INSTALLDIR]\ImageGear for C and C++ vXX\Build\Lib\x64
    4. Modify project setting Configuration Properties\Linker\Input\Additional Library Dependencies to link with the ImageGear CORE component import library, igCOREXXd.lib.
  4. At this point, your project is ready for some sample code. We will highlight key snippets in the following steps. But first, open the source file, IG_Tutorial_Console.cpp, which Visual Studio created automatically, and replace with the following:
    C
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    // IG_Tutorial_Console.c : Defines the entry point for the console application.
//
// Copyright Accusoft Corporation, Tampa Florida. All Rights Reserved.

#include "stdafx.h"
#include <string.h>

#include "gear.h"

int _tmain(int argc, _TCHAR* argv[])
{
   AT_ERRCOUNT errCount = 0;
   HIGEAR image = 0;
   AT_LMODE saveFormat = IG_SAVE_UNKNOWN;
   AT_CHAR inputPath[260];
   AT_CHAR formatCode[15];
   LPSTR outputPath = "out";

   memset(inputPath, 0, sizeof(inputPath)*(sizeof(inputPath[0])));
   memset(formatCode, 0, sizeof(formatCode)*(sizeof(formatCode[0])));
   
   fprintf(stdout, "Enter the complete path to the image to be converted: ");
   fscanf_s(stdin, "%259[^\n]%*c", inputPath);

   fprintf(stdout, "Enter the format for the new image. Choose from \"BMP\","
           "\"GIF\", \"JPG\", \"PNG\" or \"TIFF\": ");
   fscanf_s(stdin, "%14[^\n]%*c", formatCode);

   // Match the format code entered to an ImageGear save format handled with this sample.
   saveFormat = IG_SAVE_UNKNOWN;
   if (0 == _stricmp(formatCode, "BMP"))
   {
       saveFormat = IG_SAVE_BMP_UNCOMP;
       outputPath = "out.bmp";
   }
   else if (0 == _stricmp(formatCode, "GIF"))
   {
       saveFormat = IG_SAVE_GIF;
       outputPath = "out.gif";
   }
   else if (0 == _stricmp(formatCode, "JPG"))
   {
       saveFormat = IG_SAVE_JPG;
       outputPath = "out.jpg";
   }
   else if (0 == _stricmp(formatCode, "PNG"))
   {
       saveFormat = IG_SAVE_PNG;
       outputPath = "out.png";
   }
   else if (0 == _stricmp(formatCode, "TIFF"))
   {
       saveFormat = IG_SAVE_TIF_DEFLATE;
       outputPath = "out.tif";
   }
   else
   {
       fprintf(stdout, "Format is not support in this application.");
       return 1;
   }

   // Open the image.
   IG_load_file(inputPath, &image);

   // Resize the image to the width and height specified.
   // Parameter nInterpMethod indicates the type of interpolation employed.
   // It may be changed for other values, such as IG_INTERPOLATION_BICUBIC
   // or IG_INTERPOLATION_NEAREST_NEIGHBOR.
   IG_IP_resize_ex(image, 150, 150, IG_INTERPOLATION_BILINEAR, 0, 0);

   // Save the imageto the format selected.
   errCount = IG_save_file(image, outputPath, saveFormat);

   // Release the imageobject.
   IG_image_delete(image);

   if (errCount == 0)
   {
       fprintf(stdout, "Saved %s", outputPath);
       return 0;
   }
   else
   {
       fprintf(stdout, "Failed to save %s", outputPath);
       return 1;
   }
}
    C++
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    // IG_Tutorial_Console.cpp : Defines the entry point for the console application.
//
// Copyright Accusoft Corporation, Tampa Florida. All Rights Reserved.

#include "stdafx.h"
#include <iostream>
#include <string>
using namespace std;

#include "gear.h"

int main()
{
   cout << "Enter the complete path to the image to be converted: ";
   string inputPath;
   getline(cin, inputPath);

   cout << "Enter the format for the new image. "
           "Choose from \"BMP\", \"GIF\", \"JPG\", \"PNG\" or \"TIFF\": ";
   string formatCode;
   getline(cin, formatCode);

   string outputPath("out");

   // Match the format code entered to an ImageGear save format handled with this sample.
   enumIGSaveFormats saveFormat = IG_SAVE_UNKNOWN;
   if (0 == formatCode.compare("BMP"))
   {
       saveFormat = IG_SAVE_BMP_UNCOMP;
       outputPath = "out.bmp";
   }
   else if (0 == formatCode.compare("GIF"))
   {
       saveFormat = IG_SAVE_GIF;
       outputPath = "out.gif";
   }
   else if (0 == formatCode.compare("JPG"))
   {
       saveFormat = IG_SAVE_JPG;
       outputPath = "out.jpg";
   }
   else if (0 == formatCode.compare("PNG"))
   {
       saveFormat = IG_SAVE_PNG;
       outputPath = "out.png";
   }
   else if (0 == formatCode.compare("TIFF"))
   {
       saveFormat = IG_SAVE_TIF_DEFLATE;
       outputPath = "out.tif";
   }
   else
   {
       cout << "Format is not supported in this application.";
       return EXIT_FAILURE;
   }

   // Open the image.
   HIGEAR image = 0;
   IG_load_file((LPSTR)inputPath.c_str(), &image);

   // Resize the image to the width and height specified.
   // Parameter nInterpMethod indicates the type of interpolation employed.
   // It may be changed for other values, such as IG_INTERPOLATION_BICUBIC
   // or IG_INTERPOLATION_NEAREST_NEIGHBOR.
   IG_IP_resize_ex(image, 150, 150, IG_INTERPOLATION_BILINEAR, 0, 0);

   // Save the image to the format selected.
   AT_ERRCOUNT errCount = IG_save_file(image, (LPSTR)outputPath.c_str(), saveFormat);

   // Release the image object.
   IG_image_delete(image);

   if (errCount == 0)
   {
       cout << "Saved " << outputPath;
       return EXIT_SUCCESS;
   }
   else
   {
       cout << "Failed to save " << outputPath;
       return EXIT_FAILURE;
   }
}
  5. If you are using a Deployment license (also known as "Runtime" license), then add the license initialization code. This is not necessary if you are using an Evaluation license or Development license (also known as a "Toolkit" license).
    C
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       //
   // To unlock ImageGear for deployment you must call the
   // IG_lic_solution_name_set() and IG_lic_solution_key_set() and possibly
   // IG_lic_OEM_license_key_set() functions.
   // See Licensing section in ImageGear User Manual for more details.
   //
    C++
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       //
   // To unlock ImageGear for deployment you must call the
   // IG_lic_solution_name_set() and IG_lic_solution_key_set() and possibly
   // IG_lic_OEM_license_key_set() functions.
   // See Licensing section in ImageGear User Manual for more details.
   //
  6. We load the image using:
    C
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       // Open the image.
   IG_load_file(inputPath, &image);
    C++
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       // Open the image.
   HIGEAR image= 0;
   IG_load_file((LPSTR)inputPath.c_str(), &image);
  7. We resize the image to 150x150 pixels by defining the width, the height, and the interpolation approach as follows:
    C
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       // Resize the image to the width and height specified.
   // Parameter nInterpMethod indicates the type of interpolation employed.
   // It may be changed for other values, such as IG_INTERPOLATION_BICUBIC
   // or IG_INTERPOLATION_NEAREST_NEIGHBOR.
   IG_IP_resize_ex(image, 150, 150, IG_INTERPOLATION_BILINEAR, 0, 0);
    C++
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       // Resize the image to the width and height specified.
   // Parameter nInterpMethod indicates the type of interpolation employed.
   // It may be changed for other values, such as IG_INTERPOLATION_BICUBIC
   // or IG_INTERPOLATION_NEAREST_NEIGHBOR.
   IG_IP_resize_ex(image, 150, 150, IG_INTERPOLATION_BILINEAR, 0, 0);
  8. We save the image based on the saveFormat specified:

    The majority of ImageGear functions return either an error code, enumIGErrorCodes, or an error count, AT_ERRCOUNT. For brevity, we ignore ImageGear return values in this sample except for saving. This will allow us to indicate that saving was successful with an appropriate message and exit code.

    C
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       // Save the image to the format selected.
   errCount = IG_save_file(image, outputPath, saveFormat);
    C++
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       // Save the image to the format selected.
   AT_ERRCOUNT errCount = IG_save_file(image, (LPSTR)savePath.c_str(), saveFormat);
  9. Finally, release any ImageGear resources before exiting:
    C
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       // Release the image object.
   IG_image_delete(image);
    C++
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       // Release the image object.
   IG_image_delete(image);
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