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A Powerful Easy-To-Read Logging System

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1o0oBhP 1o0oBhP is offline Offline Dec 19th, 2004, 1:05 pm |
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Log files are useful things. They are used in programs to display the values or variables or other useful information such as what the program is doing. This is useful is the program crashes at some point or is not behaving as it should. By writing values and events to a log you can check back and see what happened! Most logs are text files, which take a while to search though and arent very easy to debug. HTML files however support different colours for different events (ie green text if it worked, red if its an error....) and images (so you can dump screenshots ect). The following code forms the basis to create a log file in HTML which has icons and font colours to show what type of event happened and also is tabulated so it is easy to read.
To make it work you need 3 bmps to use as icons (i recommend 16x16). I have files for download, check in the main forums. Run it and look at the resulting HTML file. Enjoy!
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Code Snippet
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  1. #include <fstream>
  2. #include <string>
  3.  
  4. #define APP_NAME    "Program name"
  5. #define COMPANY_NAME "CompanyX"
  6.  
  7. #define NORMAL_COLOUR    "#0000FF" // Blue
  8. #define WARNING_COLOUR   "#FF8000" // orange
  9. #define ERROR_COLOUR     "#FF0000" // red  
  10.  
  11. using namespace std;
  12. string logfile = "log.html";
  13. bool logisopen = 0;
  14.  
  15. void OpenLog(void)
  16. {
  17.     if(!logisopen)
  18.     {
  19.         string str = "<html>\n<head>\n<title>";
  20.         str += APP_NAME;
  21.         str += " Logging system &copy";
  22.         str += COMPANY_NAME;
  23.         str += "</title>\n</head>\n<body>\n<table>\n<caption><b>";
  24.         str += "LOG ENTRIES</b></caption>";
  25.  
  26.         fstream file;
  27.         file.open(logfile.c_str(), ios::out | ios::trunc);
  28.         file.seekp(0, ios::beg);
  29.         file.write(str.c_str(), str.length());
  30.         file.close();
  31.  
  32.         logisopen = 1;
  33.     }    
  34. }
  35.  
  36. void AddNormalEntryToLog(char* text)
  37. {
  38.     if(logisopen)
  39.     {
  40.         string str = "<tr><td><img src=\"log_ok.bmp\"></td><td>";
  41.         str += "<font color=\"";
  42.         str += NORMAL_COLOUR;
  43.         str += "\"><b>";
  44.         str += text;
  45.         str += "</b></font></td></tr>";
  46.  
  47.         fstream file;
  48.         file.open(logfile.c_str(), ios::app | ios::out);
  49.         file.write(str.c_str(), str.length());
  50.         file.close();
  51.     }    
  52. }
  53. void AddWarningEntryToLog(char* text)
  54. {
  55.     if(logisopen)
  56.     {
  57.         string str = "<tr><td><img src=\"log_warning.bmp\"></td><td>";
  58.         str += "<font color=\"";
  59.         str += WARNING_COLOUR;
  60.         str += "\"><b>";
  61.         str += text;
  62.         str += "</b></font></td></tr>";
  63.  
  64.         fstream file;
  65.         file.open(logfile.c_str(), ios::app | ios::out);
  66.         file.write(str.c_str(), str.length());
  67.         file.close();
  68.     } 
  69. }
  70. void AddErrorEntryToLog(char* text)
  71. {
  72.     if(logisopen)
  73.     {
  74.         string str = "<tr><td><img src=\"log_error.bmp\"></td><td>";
  75.         str += "<font color=\"";
  76.         str += ERROR_COLOUR;
  77.         str += "\"><b>";
  78.         str += text;
  79.         str += "</b></font></td></tr>";
  80.  
  81.         fstream file;
  82.         file.open(logfile.c_str(), ios::app | ios::out);
  83.         file.write(str.c_str(), str.length());
  84.         file.close();
  85.     } 
  86. }
  87.  
  88. void CloseLog(void)
  89. {
  90.     if(logisopen)
  91.     {
  92.         string str = "</table>\n</body>\n</html>";
  93.  
  94.         fstream file;
  95.         file.open(logfile.c_str(), ios::out | ios::app); 
  96.         file.write(str.c_str(), str.length());
  97.         file.close();
  98.     }
  99.  
  100.     logisopen = 0;
  101. }
  102.  
  103. int WINAPI WinMain (HINSTANCE hThisInstance,
  104.                     HINSTANCE hPrevInstance,
  105.                     LPSTR lpszArgument,
  106.                     int nFunsterStil)
  107.  
  108. {
  109.  
  110.     char this_path[MAX_PATH];
  111. 	char log_txt[MAX_PATH];
  112.     HINSTANCE hInstance = GetModuleHandle(NULL);
  113. 	GetModuleFileName(hInstance, this_path, MAX_PATH);
  114.     strcat(log_txt, "Program started. EXE = ");
  115.     strcat(log_txt, this_path);
  116.  
  117.     OpenLog();
  118.     AddNormalEntryToLog(log_txt);
  119.     AddNormalEntryToLog("Registered Window Class");
  120.     AddWarningEntryToLog("WARNING: Could not load data!");
  121.     AddWarningEntryToLog("WARNING: Virtual Memory Low");
  122.     AddErrorEntryToLog("ERROR: Could not initialise DirectX");
  123.  
  124.     CloseLog();
  125.     return 0;
  126. }
Code Snippet Comments
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1o0oBhP 1o0oBhP is offline Offline | Dec 19th, 2004
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Sorry! couldnt work out how to upload fiiles so ull have to draw some icons yourself!
 
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vegaseat vegaseat is online now Online | Dec 19th, 2004
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This idea is good. FunsterStil sounds Dutch to me!
 
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1o0oBhP 1o0oBhP is offline Offline | Dec 20th, 2004
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Its what the DevC++ Windows Template Gave me!!! i dont actually know yet what the significance of that parameter is and its only used to show the window...
 
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1o0oBhP 1o0oBhP is offline Offline | Dec 20th, 2004
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PS: This is a windows app! the three bmps you need to make should be called log_ok.bmp, log_warning.bmp and log_error.bmp. You could make these filenames #define'd constants so that someone else may change them....
 
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vegaseat vegaseat is online now Online | Dec 21st, 2004
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After three bottles of Dutch beer I figured it out, FunsterStil means Windows Style.
 
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1o0oBhP 1o0oBhP is offline Offline | Dec 21st, 2004
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Ah ha!! you mean whether its max/min/default! it makes sense now i should have seen it after programming a text editor and using the windows size message.....
 
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Teddy Teddy is offline Offline | Jan 19th, 2005
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The logs are always good. I would not implement icons, they take a lot of resources.
 
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1o0oBhP 1o0oBhP is offline Offline | Mar 23rd, 2005
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They only take up minute disk space and minimal ram on the html docs! You can always NOT provide a file, then nothing is drawn...
 
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Rodan Rodan is offline Offline | Jun 17th, 2005
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I get the following error code when I try to complie this source code??? I did a straight copy and past into Dev-C++.

"103 C:\Programs I Made\Logging File through HTML.cpp `WINAPI' does not name a type"

Any ideas?
 
 

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