Question

VC读取一幅JPG图像

Answer 1

用GDI＋
添加Gdiplus.lib到工程中

头文件中添加
#ifndef ULONG_PTR
#define ULONG_PTR unsigned long* //定义类型

#include "Gdiplus.h" //包含gdi头文件
using namespace Gdiplus; //命名空间

添加类成员变量

GdiplusStartupInput m_gdiPlusInPut;
ULONG_PTR m_gdiPlusToken;

构造函数中初始化GDI+

GdiplusStartup( &m_gdiPlusToken, &m_gdiPlusInPut, NULL );

析构函数中 //销毁GDI+

GdiplusShutdown(gdiplusToken);

OnPaint()中：

//CDialog::OnPaint();
CPaintDC dc( this );

//建立图形对象
Graphics mGraphics( dc.GetSafeHdc() );

//装入图像文件

Image img( L"./res/test.jpg", TRUE );

//在指定区域pdestPoints显示图像 （根据背景大小按比例缩放）

CRect rcClient;
GetClientRect( &rcClient );

BOOL bWidth = rcClient.Width() / img.GetWidth() > rcClient.Height() / img.GetHeight();
if ( bWidth )
{
mGraphics.DrawImage( &img, 0, 0, rcClient.Width(), rcClient.Width() * img.GetHeight() / img.GetWidth() );
}
else
{
mGraphics.DrawImage(&img, 0, 0, rcClient.Height() * img.GetWidth() / img.GetHeight(), rcClient.Height() );
}

//原始大小
mGraphics.DrawImage(&img, 0, 0, img.GetWidth(), img.GetHeight() );

Answer 2

{
typedef int (WINAPI ICEPUB_DISPIMG)(HWND hWnd,char *strImgFilename,int x,int y);
ICEPUB_DISPIMG *icePub_dispImg = 0;
HINSTANCE hDLLDrv = LoadLibrary("icePubDll.dll");
if(hDLLDrv)
{
icePub_dispImg = (ICEPUB_DISPIMG *)GetProcAddress(hDLLDrv, "icePub_dispImg");
}

if(icePub_dispImg != NULL)
icePub_dispImg(m_hWnd,"b.png",10,10);
// icePub_dispImg(m_ctrlText.m_hWnd,"b.jpg",0,0);
if(hDLLDrv)
FreeLibrary(hDLLDrv);
}

Answer 3

这个用各种库比较简单啊

Answer 4

最简单的就是用图片控件