Memory allocation problem !!!

Game point

Hello Sir,

char **argv
argv = (char**)malloc(3*sizeof(char*));
argv[1] = (char*)malloc((20)*sizeof(char));
argv[1] = "D:\\Input.jpg";

When I debug my application argv[1] - 0x00000000 CXX0030:Error Expression cannot be evaluated What i am mistaking above code ..please replay thanks

PrafullaShirke27

char **argv = NULL;
argv = (char**)malloc(3*sizeof(char*));
argv[1] = (char*)malloc((20)*sizeof(char));
argv[1] = "D:\\Input.jpg";
cout<

Its working guy.

Game point

thanks for your replay ..sir

char **argv = NULL;
argv = (char**)malloc(3*sizeof(char*));
argv[0] = argv1[0];
argv[1] = (char*)malloc((20)*sizeof(char));
argv[1] = "D:\\Input.jpg";
::MessageBox(0,(LPWSTR)argv[1],(LPWSTR)"test",0);

the output of message box string is showing unknown square box .. i dont know why sir ..please replay thanks

PrafullaShirke27

char **argv = NULL;
argv = (char**)malloc(3*sizeof(char*));
//argv[0] = argv1[0];
argv[1] = (char*)malloc((20)*sizeof(char));
argv[1] = "D:\\Input.jpg";
::MessageBox(0,(LPCTSTR)argv[1],(LPCTSTR)"test" ,0);

CPallini

PrafullaShirke27 wrote:

argv[1] = (char*)malloc((20)*sizeof(char)); argv[1] = "D:\\Input.jpg";

What's the purpose of the above sequence? [added] I reckon it was already in the OP post. [/added] :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong. -- Iain Clarke
[My articles]

PrafullaShirke27

What is OP post?

CPallini

raju_Code wrote:

char **argv = NULL; argv = (char**)malloc(3*sizeof(char*)); argv[0] = argv1[0]; argv[1] = (char*)malloc((20)*sizeof(char)); argv[1] = "D:\\Input.jpg"; ::MessageBox(0,(LPWSTR)argv[1],(LPWSTR)"test",0);

What a mess! Try:

TCHAR * argv[3];
// here you may need a conversion if argv1 is an ANSI string
argv[1] = _T("D:\\Input.jpg");
::MessageBox(0, argv[1],_T("test"),MB_OK);

:)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong. -- Iain Clarke
[My articles]

CPallini

Original Poster's message. :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong. -- Iain Clarke
[My articles]

David Crow

raju_Code wrote:

argv[1] = (char*)malloc((20)*sizeof(char)); argv[1] = "D:\\Input.jpg";

Why bother allocating memory if you are just going to reassign the pointer?

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