使用 GDI+ API 绘制图像 [英] Using the GDI+ API to draw an image

问题描述

我使用 GDI+ API 只是为了在屏幕上显示图像 (bmp).这是执行任务的函数的代码:

I'm using the GDI+ API just to display an image (bmp) on the screen. Here is the code of the function doing the task:

void drawImg_ArmorInfo_PupupWnd(HDC hdc) {

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

    Image* image = new Image(L"C:/Users/Darek/F2 stuff/art/intrface/armor_info_1.bmp");
    int a1 = image->GetWidth();
    int a2 = image->GetHeight();

    Graphics graphics(hdc);
    graphics.DrawImage(image, 0, 0);

    delete image;
    GdiplusShutdown(gdiplusToken);
}

问题是我在调用 GdiplusShutdown 函数后得到一个异常:访问冲突写入位置 0xXXXXXXXX.当我注释掉

The problem is that I'm getting an exception: Access violation writing location 0xXXXXXXXX after calling the GdiplusShutdown function. What's interesting when I comment out the

Graphics graphics(hdc);
graphics.DrawImage(image, 0, 0);

部分程序运行没有任何问题，但是，当然，没有绘制图像.当我注释掉对 GdiplusShutdown 函数的调用时 - 没有问题了.

part the program runs without any problems but, of course, the image isn't drawn. When I comment out the call to GdiplusShutdown function - no problems again.

代码有什么问题，问题的原因是什么?

What's wrong with the code and what can be the reason of the problem here?

推荐答案

graphics 在 GdiplusShutdown 之后超出范围，因此无法正确销毁.

graphics falls out of the scope after the GdiplusShutdown so it cannot destruct correctly.

试试这个:

Graphics * graphics = new Graphics(hdc);
graphics->DrawImage(image, 0, 0);
delete graphics;

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