用win32api显示BMP图片的最简单方案？

[improgrammer]

搜索过了，好象都是用某类控件的。不知用WIN32的API如何做到？

[improgrammer]

感谢两位的帮助。
TO doon(东方)：
IPicture实际上就是第三方库？

再问东方：
IPicture定义于哪个tlb或dll或ocx文件中？我想#import <...>它(^-^)

[improgrammer]

to dog0883(笨狗一条) :
不写窗口过程能显示图片吗？

[6spring]

其他格式图片，GDI+好了~~~~ （这个不算第三方吧）

[snowbirdfly]

BitBlt
The BitBlt function performs a bit-block transfer of the color data corresponding to a rectangle of pixels from the specified source device context into a destination device context.

BOOL BitBlt(
HDC hdcDest, // handle to destination DC
int nXDest, // x-coord of destination upper-left corner
int nYDest, // y-coord of destination upper-left corner
int nWidth, // width of destination rectangle
int nHeight, // height of destination rectangle
HDC hdcSrc, // handle to source DC
int nXSrc, // x-coordinate of source upper-left corner
int nYSrc, // y-coordinate of source upper-left corner
DWORD dwRop // raster operation code
);
Charles Petzold的《windows程序设计》上面有介绍~~

[dog0883]

不写窗体过程是什么意思啊？没有消息处理函数，在WinMain里就贴出来图？

[improgrammer]

up

[dog0883]

楼主是这个意思？请看一下代码


/*-----------------------------------------------
BRICKS3.C -- CreatePatternBrush Demonstration
(c) Charles Petzold, 1998
-----------------------------------------------*/

#include <windows.h>

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName [] = TEXT ("Bricks3") ;
HBITMAP hBitmap ;
HBRUSH hBrush ;
HWND hwnd ;
MSG msg ;
WNDCLASS wndclass ;

hBitmap = LoadBitmap (hInstance, TEXT ("Bricks")) ;
hBrush = CreatePatternBrush (hBitmap) ;
DeleteObject (hBitmap) ;

wndclass.style = CS_HREDRAW | CS_VREDRAW ;
wndclass.lpfnWndProc = WndProc ;
wndclass.cbClsExtra = 0 ;
wndclass.cbWndExtra = 0 ;
wndclass.hInstance = hInstance ;
wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION) ;
wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
wndclass.hbrBackground = hBrush ;
wndclass.lpszMenuName = NULL ;
wndclass.lpszClassName = szAppName ;

if (!RegisterClass (&wndclass))
{
MessageBox (NULL, TEXT ("This program requires Windows NT!"),
szAppName, MB_ICONERROR) ;
return 0 ;
}

hwnd = CreateWindow (szAppName, TEXT ("CreatePatternBrush Demo"),
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT,
NULL, NULL, hInstance, NULL) ;

ShowWindow (hwnd, iCmdShow) ;
UpdateWindow (hwnd) ;

while (GetMessage (&msg, NULL, 0, 0))
{
TranslateMessage (&msg) ;
DispatchMessage (&msg) ;
}

DeleteObject (hBrush) ;
return msg.wParam ;
}

LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_DESTROY:
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}



BRICKS3.RC (excerpts)
//Microsoft Developer Studio generated resource script.
#include "resource.h"
#include "afxres.h"

/////////////////////////////////////////////////////////////////////////////
// Bitmap

BRICKS BITMAP DISCARDABLE "Bricks.bmp"

[dog0883]

/*---------------------------------------
BITBLT.C -- BitBlt Demonstration
(c) Charles Petzold, 1998
---------------------------------------*/

#include <windows.h>

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName [] = TEXT ("BitBlt") ;
HWND hwnd ;
MSG msg ;
WNDCLASS wndclass ;

wndclass.style = CS_HREDRAW | CS_VREDRAW ;
wndclass.lpfnWndProc = WndProc ;
wndclass.cbClsExtra = 0 ;
wndclass.cbWndExtra = 0 ;
wndclass.hInstance = hInstance ;
wndclass.hIcon = LoadIcon (NULL, IDI_INFORMATION) ;
wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
wndclass.lpszMenuName = NULL ;
wndclass.lpszClassName = szAppName ;

if (!RegisterClass (&wndclass))
{
MessageBox (NULL, TEXT ("This program requires Windows NT!"),
szAppName, MB_ICONERROR) ;
return 0 ;
}

hwnd = CreateWindow (szAppName, TEXT ("BitBlt Demo"),
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT,
NULL, NULL, hInstance, NULL) ;

ShowWindow (hwnd, iCmdShow) ;
UpdateWindow (hwnd) ;

while (GetMessage (&msg, NULL, 0, 0))
{
TranslateMessage (&msg) ;
DispatchMessage (&msg) ;
}
return msg.wParam ;
}

LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static int cxClient, cyClient, cxSource, cySource ;
HDC hdcClient, hdcWindow ;
int x, y ;
PAINTSTRUCT ps ;

switch (message)
{
case WM_CREATE:
cxSource = GetSystemMetrics (SM_CXSIZEFRAME) +
GetSystemMetrics (SM_CXSIZE) ;

cySource = GetSystemMetrics (SM_CYSIZEFRAME) +
GetSystemMetrics (SM_CYCAPTION) ;
return 0 ;

case WM_SIZE:
cxClient = LOWORD (lParam) ;
cyClient = HIWORD (lParam) ;
return 0 ;

case WM_PAINT:
hdcClient = BeginPaint (hwnd, &ps) ;
hdcWindow = GetWindowDC (hwnd) ;

for (y = 0 ; y < cyClient ; y += cySource)
for (x = 0 ; x < cxClient ; x += cxSource)
{
BitBlt (hdcClient, x, y, cxSource, cySource,
hdcWindow, 0, 0, SRCCOPY) ;
}

ReleaseDC (hwnd, hdcWindow) ;
EndPaint (hwnd, &ps) ;
return 0 ;
case WM_DESTROY:
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}
一段示例代码

[dog0883]

上一段代码不需要别的位图资源。下面这一段需要建一个"Brisk.bmp"的位图资源。

/*----------------------------------------
BRICKS1.C -- LoadBitmap Demonstration
(c) Charles Petzold, 1998
----------------------------------------*/


#include <windows.h>

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName [] = TEXT ("Bricks1") ;
HWND hwnd ;
MSG msg ;
WNDCLASS wndclass ;

wndclass.style = CS_HREDRAW | CS_VREDRAW ;
wndclass.lpfnWndProc = WndProc ;
wndclass.cbClsExtra = 0 ;
wndclass.cbWndExtra = 0 ;
wndclass.hInstance = hInstance ;
wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION) ;
wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
wndclass.lpszMenuName = NULL ;
wndclass.lpszClassName = szAppName ;

if (!RegisterClass (&wndclass))
{
MessageBox (NULL, TEXT ("This program requires Windows NT!"),
szAppName, MB_ICONERROR) ;
return 0 ;
}

hwnd = CreateWindow (szAppName, TEXT ("LoadBitmap Demo"),
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT,
NULL, NULL, hInstance, NULL) ;

ShowWindow (hwnd, iCmdShow) ;
UpdateWindow (hwnd) ;

while (GetMessage (&msg, NULL, 0, 0))
{
TranslateMessage (&msg) ;
DispatchMessage (&msg) ;
}
return msg.wParam ;
}

LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static HBITMAP hBitmap ;
static int cxClient, cyClient, cxSource, cySource ;
BITMAP bitmap ;
HDC hdc, hdcMem ;
HINSTANCE hInstance ;
int x, y ;
PAINTSTRUCT ps ;

switch (message)
{
case WM_CREATE:
hInstance = ((LPCREATESTRUCT) lParam)->hInstance ;

hBitmap = LoadBitmap (hInstance, TEXT ("Bricks")) ;

GetObject (hBitmap, sizeof (BITMAP), &bitmap) ;

cxSource = bitmap.bmWidth ;
cySource = bitmap.bmHeight ;

return 0 ;

case WM_SIZE:
cxClient = LOWORD (lParam) ;
cyClient = HIWORD (lParam) ;
return 0 ;

case WM_PAINT:
hdc = BeginPaint (hwnd, &ps) ;

hdcMem = CreateCompatibleDC (hdc) ;
SelectObject (hdcMem, hBitmap) ;

for (y = 0 ; y < cyClient ; y += cySource)
for (x = 0 ; x < cxClient ; x += cxSource)
{
BitBlt (hdc, x, y, cxSource, cySource, hdcMem, 0, 0, SRCCOPY) ;
}

DeleteDC (hdcMem) ;
EndPaint (hwnd, &ps) ;
return 0 ;

case WM_DESTROY:
DeleteObject (hBitmap) ;
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}



BRICKS1.RC (excerpts)

//Microsoft Developer Studio generated resource script.
#include "resource.h"
#include "afxres.h"

/////////////////////////////////////////////////////////////////////////////
// Bitmap

BRICKS BITMAP DISCARDABLE "Bricks.bmp"

[improgrammer]

谢谢狗兄:)
2005-08-15 21:34:00 的程序只显示一个中空的窗口。
编译过程如下：
D:\vroot\myc>cl pezold.cpp pezold.res user32.lib gdi32.lib
Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 13.10.3077 for 80x86
Copyright (C) Microsoft Corporation 1984-2002. All rights reserved.

pezold.cpp
Microsoft (R) Incremental Linker Version 7.10.3077
Copyright (C) Microsoft Corporation. All rights reserved.

/out:pezold.exe
pezold.obj
pezold.res
user32.lib
gdi32.lib

[improgrammer]

to dog0883:
1、谢谢！确实是因为rc文件里没有设好名字。
2、想实现象MessageBox(NULL, "TEXT", "TITLE", MB_OK)这样方便的接口。

void ShowImage(const char *filename);
或者至少
void ShowImage(HBITMAP bmp);

to doon:
{
用windows的IPicture对象，不过比较麻烦，
首先要申请一段内存，GloableAlloc,
然后把文件整个读到这段内存中
从内存创建一个IStream对象，
在从IStream对象中创建IPicture对象
用IPicture::Render来显示位图
}
难道把一个JPG文件或BMP文件逐字节读到一块内存里，然后CreateStreamOnHGlobal()，中间不要任何处理，就为OleLoadPicture()做好准备了吗？
void ShowImage(HDC dc, const char *fn)
{
//Read Bytes From www.jpg INTO mem;
HFILE hf = CreateFile(fn, FILE_READ_DATA, FILE_SHARE_READ, NULL, OPEN_EXISTING,
FILE_ATTRIBUTE_READONLY, NULL);
SIZE_T sz = GetFileSize(hf, NULL);
HGLOBAL hg = GlobalAlloc(GMEM_MOVEABLE, sz);
unsigned char *p = (unsigned char*)GlobalLock(hg);
ReadFile(hf, p, sz, &sz, NULL);
IStream *is;
CreateStreamOnHGlobal(hg, TRUE, &is);
IPicture *pic;
OleLoadPicture(is, sz, 0, IID_IPicture, &pic);
pic->Render(dc, 0, 0, 100, 100, 0, 0, 100, 100, NULL);
}

[improgrammer]

to dog0883:
似乎可以把WinMain()改为ShowImage()就象我要的东西了，但是：
那个hInstance不知哪里来？如何得到hInstance呢？
ShowImage()的调用者确实应该知道资源放在哪个可执行文件里（exe或dll，一般就是自身）。
问题是不依赖于WinMain()入口参数的情况下，如何得到有效的hInstance？
谢谢！

[dog0883]

用全局变量？
HINSTANCE ghInstance;

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
//do something
ghInstance=hInstance;
//do something
return 0;
}

[kenyle]

一般的说，实现对Bitmap显示最简单的ＡＰＩ的方法你可以从以下几个方面来思考，ＢＭＰ以资源的形式出现，以文件的方式出现！
１、以资源的方式出现可以十分方便的用，LoadBitmap可以完成。然后得到ＨＤＣ，在将load的ＢＭＰ,SelectObject到ＤＣ，在使用ＢitBlt就可以显示。
２、以文件的方式，可以做二种，
第一种：同样是load相关的函数可以完成！但用LoadBitmap最简单，最方便，学习价值最低。
第二种：用流的方式将ＢＭＰ读到内存，然后你可以用CreateBitmap的方式试一下，这样需要知道Ｂitmap的头文件结构，虽方法麻烦但是学习价值最高。

[漂流的代码]

to improgrammer(无忌)
IPicture是windows自己的库，见Msdn:
Windows NT/2000/XP: Requires Windows NT 4.0 or later.
Windows 95/98: Requires Windows 95 or later.
Header: Declared in ocidl.h.
不需要引入任何库文件，因为他是个com

[dog0883]

我也用VC7编译了，没有问题啊。要把那个位图的ID设成"Bricks"以和
hBitmap = LoadBitmap (hInstance, TEXT ("Bricks")) ;对应

[rockhard]

mark

[improgrammer]

我得到这样的代码：

程序：

#include <windows.h>
#include "resource.h"

static HINSTANCE hinstDll;

static int WINAPI DlgProc(HWND hdlg, UINT msg, WPARAM wp, LPARAM lp)
{
switch (msg)
{
case WM_CLOSE:
EndDialog(hdlg, 0);
break;
}
return 0;
}

void splash()
{
DialogBox(hinstDll, MAKEINTRESOURCE(IDD_SPLASH), 0, DlgProc);
}

BOOL WINAPI DllMain(HINSTANCE hinst, DWORD fdwReason, LPVOID )
{
switch (fdwReason)
{
case DLL_PROCESS_ATTACH:
hinstDll = hinst;
break;
}
return TRUE;
}

资源：
// splash.rc
#include "resource.h"
#include "afxres.h"

// Icon with lowest ID value placed first to ensure application icon
// remains consistent on all systems.
IDI_MAIN ICON "gtzy.ico"

GOFISHING BITMAP "GoFishing.bmp"

IDD_SPLASH DIALOGEX 0, 0, 351, 221
STYLE DS_SETFONT | DS_MODALFRAME | DS_FIXEDSYS | DS_CENTER | WS_POPUP |
WS_CAPTION | WS_SYSMENU
CAPTION "E00_MapGIS"
FONT 10, "宋体", 0, 0, 0x0
BEGIN
CONTROL "GOFISHING",IDC_STATIC,"Static",SS_BITMAP,24,17,15,14
END

做成DLL后，使用时只要调用splash()就可以了。
这是我到目前为止得到的最简单的代码。
各位评价评价……

[improgrammer]

to dog0883:
我的程序根本不想以WinMain开始，而想就用传统的main()。
所以，无法从启动参数中获得hInstance，而LoadBitmap()又一定要这么个值。
有没有一个Win32 API函数可以解决这个问题:-)

[improgrammer]

CSDN怎么了？我分明已经给分，为什么看不到给分列表呢？