CODEWITHSUNDEEP
winapigdi+
Trey
Trey

Reputation: 554

GDI+ methods are missing

So I'm trying to use the method Bitmap::GetHistogram from GDI+ but apparently it doesn't exist. I already made sure to initialize everything with

    Gdiplus::GdiplusStartupInput gdiplusStartupInput;
    ULONG_PTR gdiplusToken;
    GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);

at the start of WinMain, here's the problematic snippet:

    UINT numEntries;
    Gdiplus::Bitmap myBitmap(pszFilePath);
    Gdiplus::Image myImage(pszFilePath);

    UINT iHeight = myImage.GetHeight(); // works
    UINT iWidth = myImage.GetWidth(); // works
    myBitmap.GetHistogramSize(HistogramFormatRGB, &numEntries); // not defined

These are all the header files included:

#include <Unknwn.h>
#include <windows.h>
#include <Gdiplus.h>
#include <stdio.h>
#include <iostream>
#include <commdlg.h>
#include <commctrl.h>
#include <winioctl.h>
#include <Objbase.h>
#include <shobjidl.h>
#include <objidl.h>
#include <strsafe.h>

The method simply isn't' there:

enter image description here

What might causing this and how do I fix it?

Upvotes: 0

Views: 215

Answers (1)

Drake Wu
Drake Wu

Reputation: 7170

I'm curious as to why this happened

Because the method needs the GDIPVER >= 0x0110 in gdiplusbitmap.h:

#if (GDIPVER >= 0x0110)
...
inline Status
Bitmap::GetHistogram(
    IN HistogramFormat format,
    IN UINT NumberOfEntries,
    _Out_writes_bytes_(sizeof(UINT)*256) UINT *channel0,
    _Out_writes_bytes_(sizeof(UINT)*256) UINT *channel1,
    _Out_writes_bytes_(sizeof(UINT)*256) UINT *channel2,
    _Out_writes_bytes_(sizeof(UINT)*256) UINT *channel3
)
{
    return DllExports::GdipBitmapGetHistogram(
        static_cast<GpBitmap *>(nativeImage),
        format,
        NumberOfEntries,
        channel0,
        channel1,
        channel2,
        channel3
        );
}

inline Status 
Bitmap::GetHistogramSize(
    IN HistogramFormat format,
    OUT UINT *NumberOfEntries
)
{
    return DllExports::GdipBitmapGetHistogramSize(
        format,
        NumberOfEntries
        );
}

#endif // (GDIPVER >= 0x0110)

All recent OS (>= Vista) have GDIPlus 1.1. But if you do not specify GDIPVER to 0x0110 to enable the function of version 1.1, the default version will be specified as 1.0 in gdiplus.h:

// Define the Current GDIPlus Version
#ifndef GDIPVER
#define GDIPVER 0x0100
#endif

Upvotes: 1

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