图片析构函数中的访问冲突 [英] Access violation in Image destructor

问题描述

我可能会说一个非常简单的程序。

A very simple program I might say..

#include <windows.h>
#include <gdiplus.h>

using namespace Gdiplus;

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE, LPSTR cmdLine, int nShow){
    // Gdiplus variables
    GdiplusStartupInput mGdiplusStartupInput;
    ULONG_PTR           mGdiplusToken;
    GdiplusStartup(&mGdiplusToken, &mGdiplusStartupInput, NULL);

    Bitmap bitmap(L"left.bmp");


    GdiplusShutdown(mGdiplusToken);
    return 0;
}

在运行此示例时，此函数在GdiplusBitmap.h中出现访问冲突

When running this example I get an access violation in GdiplusBitmap.h in this function

inline 
Image::~Image()
{
    DllExports::GdipDisposeImage(nativeImage);
}

通过删除对 Bitmap bitmap（L left.bmp）; 一切正常。.我试图在msdn上找到一个简单的示例（例如位图构造函数，但未找到任何内容。）

By removing the call to Bitmap bitmap(L"left.bmp"); everything works fine.. I tried to find a simple example on msdn (for instance somewhere near the Bitmap constructor, but didn't find anything.)

我缺少什么？

推荐答案

您创建的位图实例正在下降在调用关闭GDI +之后超出范围。因此，当位图被破坏时，它无法调用给定的 GdipDisposeImage 方法。

The Bitmap instance you created is falling out of scope AFTER the call to shutdown GDI+. So when the Bitmap gets destructed, it cannot call the given GdipDisposeImage method.

如果在关闭GDI +之前确保已删除位图，则错误应消失。

The error should go away if you make sure that bitmap is deleted before you shutdown GDI+.

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