need some help understanding this code win32

**airesore** · 10-17-2011

Basicly I want to get the user to input a directory and file name in another program, then the program saves it.

I plan to modify this code to suit my needs, however i need someone to help me understand this code better.

I can't seem to find where string is when the user enter something in and clicks the button. Would be nice if someone could tell me from line 4 to 33.

Code:

#include <windows.h>
#define ID_EDIT 1
#define ID_BUTTON 2
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
  static HWND hwndEdit;
  static HWND hwndButton;
  static int len;
  static TCHAR text[30];

  switch(msg)
  {
    case WM_CREATE:
 hwndEdit = CreateWindow(TEXT("Edit"), NULL, WS_CHILD | WS_VISIBLE | WS_BORDER,
    50, 50, 150, 20, hwnd, (HMENU) ID_EDIT,
    NULL, NULL);
 hwndButton = CreateWindow(
  TEXT("button"), TEXT("Set Title"),       
  WS_VISIBLE | WS_CHILD,  
  50, 100, 80, 25,        
  hwnd, (HMENU) ID_BUTTON, NULL, NULL);      
 break;
 case WM_COMMAND: 
           if (HIWORD(wParam) == BN_CLICKED) {
               len = GetWindowTextLength(hwndEdit) + 1;
               GetWindowText(hwndEdit, text, len);
               SetWindowText(hwnd, text);
           }
 break;
 case WM_DESTROY:
  PostQuitMessage(0);
 break;
  }
  return DefWindowProc(hwnd, msg, wParam, lParam);
}
int WINAPI WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance,
   LPSTR lpCmdLine, int nCmdShow )
{
  MSG  msg ;    
  WNDCLASS wc = {0};
  wc.lpszClassName = TEXT( "Edit Control" );
  wc.hInstance     = hInstance ;
  wc.hbrBackground = GetSysColorBrush(COLOR_3DFACE);
  wc.lpfnWndProc   = WndProc ;
  wc.hCursor       = LoadCursor(0,IDC_ARROW);
  
  RegisterClass(&wc);
  CreateWindow( wc.lpszClassName, TEXT("Edit control"),
                WS_OVERLAPPEDWINDOW | WS_VISIBLE,
                220, 220, 280, 200, 0, 0, hInstance, 0);  
  while( GetMessage(&msg, NULL, 0, 0)) {
    TranslateMessage(&msg);
    DispatchMessage(&msg);
  }
  return (int) msg.wParam;
}

**adeyblue** · 10-17-2011

Originally Posted by airesore

Would be nice if someone could tell me from line 4 to 33.

Somebody did. Look at the text both above and below this code on the tutorial you got it from.

**airesore** · 10-17-2011

ok i read it and was able to save the char array as a string. Now I want this function in my other program. How do i combine this

Code:

case WM_CREATE:
 hwndEdit = CreateWindow(TEXT("Edit"), NULL, WS_CHILD | WS_VISIBLE | WS_BORDER,
    50, 50, 150, 20, hwnd, (HMENU) ID_EDIT,
    NULL, NULL);
 hwndButton = CreateWindow(
  TEXT("button"), TEXT("ok"),       
  WS_VISIBLE | WS_CHILD,  
  50, 100, 80, 25,        
  hwnd, (HMENU) ID_BUTTON, NULL, NULL);      
 break;
 case WM_COMMAND: 
           if (HIWORD(wParam) == BN_CLICKED) {
               len = GetWindowTextLength(hwndEdit) + 1;
               GetWindowText(hwndEdit, text, len);
               string myString =text;
              
               
            //  char *myCharArray = (char*)myString.c_str();
            //  SetWindowText(hwnd, myCharArray);
           }
 break;

with this

Code:

#include <windows.h>
#include <stdlib.h>
#include <string>
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

int WINAPI WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance,
     LPSTR lpCmdLine, int nCmdShow )
{
  MSG  msg ;    
  WNDCLASS wc = {0};
  wc.lpszClassName = TEXT( "Buttons" );
  wc.hInstance     = hInstance ;
  wc.hbrBackground = GetSysColorBrush(COLOR_3DFACE);
  wc.lpfnWndProc   = WndProc ;
  wc.hCursor       = LoadCursor(0, IDC_ARROW);
  
  RegisterClass(&wc);
  CreateWindow( wc.lpszClassName, TEXT("XMLtoCSV"),
                WS_OVERLAPPEDWINDOW | WS_VISIBLE,
                150, 150, 230, 150, 0, 0, hInstance, 0);  
  while( GetMessage(&msg, NULL, 0, 0)) {
    TranslateMessage(&msg);
    DispatchMessage(&msg);
  }
  return (int) msg.wParam;
}
LRESULT CALLBACK WndProc( HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam )
{
    
  switch(msg)  
  {
 case WM_CREATE:
 {
        CreateWindow(TEXT("button"), TEXT("XML to CSV"),    
               WS_VISIBLE | WS_CHILD ,
               20, 30, 80, 25,        
               hwnd, (HMENU) 1, NULL, NULL);    
       
        CreateWindow(TEXT("button"), TEXT("Split CSV"),    
               WS_VISIBLE | WS_CHILD ,
               20, 70, 80, 25,        
               hwnd, (HMENU) 2, NULL, NULL); 

     CreateWindow(TEXT("button"), TEXT("Quit"),    
               WS_VISIBLE | WS_CHILD ,
               120, 50, 80, 25,        
               hwnd, (HMENU) 3, NULL, NULL);    
     break;
 }
      case WM_COMMAND:
      {
    if (LOWORD(wParam) == 2) {
       system("CSVS.bat");
    }
        if (LOWORD(wParam) == 1) {        
        //codes goes here--------------------------
    }
    if (LOWORD(wParam) == 3) {
              PostQuitMessage(0);
    }
    break;
       }
      case WM_DESTROY:
      {
         PostQuitMessage(0);
         break;
      }
  }
  return DefWindowProc(hwnd, msg, wParam, lParam);
}

I want it to make it so that it has a text box when the person click button one.

**Elysia** · 10-18-2011

Win32 programming goes to the Windows programming board, not the C++ board.

**laserlight** · 10-18-2011

Originally Posted by Elysia

Win32 programming goes to the Windows programming board, not the C++ board.

Yeah. Moved.

**~~CommonTater~~** · 10-18-2011

Well... if I were you, I'd stop trying to "borrow" code... scoop and poop programming almost never gives a satisfactory result...

Instead of wasting time harvesting bad code from the net... spend the same time and effort to Educate Yourself. Here's a good place to get started...

theForger's Win32 API Tutorial

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