Image 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..
#include #include 使用命名空间 Gdiplus;int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE, LPSTR cmdLine, int nShow){//Gdiplus 变量GdiplusStartupInput mGdiplusStartupInput;ULONG_PTR mGdiplusToken;GdiplusStartup(&mGdiplusToken, &mGdiplusStartupInput, NULL);位图 bitmap(L"left.bmp");GdiplusShutdown(mGdiplusToken);返回0;}
运行此示例时,我在此函数中的 GdiplusBitmap.h 中遇到访问冲突
内联图像::~图像(){DllExports::GdipDisposeImage(nativeImage);}
通过删除对 Bitmap bitmap(L"left.bmp");
的调用,一切正常.. 我试图在 msdn 上找到一个简单的例子(例如靠近 位图构造函数,但没有找到任何东西.)>
我错过了什么?
您创建的 Bitmap
实例在调用关闭 GDI+ 后超出范围.所以当 Bitmap
被破坏时,它不能调用给定的 GdipDisposeImage
方法.
如果您在关闭 GDI+ 之前确保删除了 bitmap
,错误应该会消失.
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;
}
When running this example I get an access violation in GdiplusBitmap.h in this function
inline
Image::~Image()
{
DllExports::GdipDisposeImage(nativeImage);
}
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.)
What am I missing?
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.
The error should go away if you make sure that bitmap
is deleted before you shutdown GDI+.
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