CODEWITHSUNDEEP
c++mfcvisual-studio-debugging
podo9264
podo9264

Reputation: 11

I am using TRACE in MFC, but it is not working(no output). why?

TRACE("This is a TRACE statement\n");
OutputDebugString("dd");
for(int x=0; x<pDoc->r_length; x++)
{
    TRACE("The value of x is %d\n", x);
    for(int y=0; y<pDoc->c_length; y++)
    {
        TRACE("x = %d and y = %d\n", x, y);
        data=pDoc->m_OpenImg[x][y]+100;//circle image +100

        //choose method for Saturation.
        if(data>255)
        {
            pDoc->m_ResultImg[x][y]=255;//save the output value
        }
        else
        {
            pDoc->m_ResultImg[x][y]=data;//save the output value.
        }
    }
}

I'm studying MFC in this semester. I want to see debug output with TRACE. (I found TRACE in MSDN) This is part of my MFC code. I put TRACE into for loop. Other than the issue TRACE and OutputDebugString is not working correctly, the other part of the code works fine. I want to see debug output. Help me please.

Upvotes: 0

Views: 3307

Answers (1)

Mark Ransom
Mark Ransom

Reputation: 308364

When you use TRACE or OutputDebugString, the output does not go to the normal command window. Instead it goes to a special debug output stream. If you run the program from within Visual Studio, you can see this stream in the Output pane. If you are running it independently (in a command window, or by double-clicking on the icon) you need a special utility that can monitor the stream. One such utility is DebugView.

Note that TRACE only works in Debug builds, while OutputDebugString works in any build type.

Upvotes: 1

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