各位高手，我该怎么办呢？在程序中我想把两个CBitmap实例存为一个文件...

2001-02-26 11:11:00 236 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

Kotlin构造函数原理与实战排障：从字节码到Android ViewModel初始化 Kotlin构造函数不是Java语法糖，而是决定对象生命周期、反射行为和跨语言互操作的核心机制。其主构造、次构造与init块构成三层初始化契约，直接影响属性初始化顺序、继承委托链和JVM字节码生成。理解这一机制，是解决Android中ViewModel实例化失败、NoSuchMethodError、superclass access check failed等高频问题的关键。它支撑着@JvmOverloads的重载生成逻辑、data class的copy安全机制，以及inline函数对lambda逃逸的编译阅读详情

在程序中我想把两个CBitmap实例存为一个文件,并且想把自己定义的一些信息也存进去。自己定义的类可以支持序列化，可是如何把这两个Bmp也寸进去呢？谢谢各位啦~~~~~

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Kotlin构造函数原理：从语法糖到JVM字节码深度解析 Kotlin构造函数并非Java的简单映射，而是一套融合语法声明、编译期契约与JVM字节码规范的三层机制。其核心在于参数前缀（val/var）决定字段生成与访问控制，主次构造函数通过强制委托保障初始化一致性，而编译器自动注入的空安全检查（如checkNotNullParameter）和@Metadata元数据则构成ABI兼容性基石。这些设计直接影响Java互操作、ProGuard混淆、反射调用及序列化行为——例如@JvmOverloads本质是生成多签名字节码构造函数，init块则被编译器内联至每个<ini 阅读详情

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CandyCat 2001-03-02

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谢谢大家，这个问题我已经解决啦。。。

Smile_Tiger 2001-02-28

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MSDN里有存储bmp的方法

在我的机器上的地址为： mk:@MSITStore:C:\Program%20Files\Microsoft%20Visual%20Studio\MSDN98\98VS\1033\GDI.chm::/devdoc/live/pdgrmm/bitmaps_7zfp.htm

主题是 "Storing an Image"

内容是
----------------------------------------------------------
Storing an Image
Many applications store images permanently as files. For example, drawing applications store pictures, spreadsheet applications store charts, CAD applications store drawings, and so on.

If you are writing an application that will store a bitmapped image in a file, you should use the bitmap file format described in Bitmap Storage. To store a bitmap in this format, you must initialize a BITMAPINFO structure (consisting of a BITMAPINFOHEADER BITMAPV4HEADER, or BITMAPV5HEADER structure and an array of RGBQUAD structures), as well as an array of palette indexes.

The following example code defines a function that allocates memory for and initializes members within a BITMAPINFOHEADER structure.

PBITMAPINFO CreateBitmapInfoStruct(HWND hwnd, HBITMAP hBmp)
{
BITMAP bmp;
PBITMAPINFO pbmi;
WORD cClrBits;

// Retrieve the bitmap's color format, width, and height.
if (!GetObject(hBmp, sizeof(BITMAP), (LPSTR)&bmp))
errhandler("GetObject", hwnd);

// Convert the color format to a count of bits.
cClrBits = (WORD)(bmp.bmPlanes * bmp.bmBitsPixel);
if (cClrBits == 1)
cClrBits = 1;
else if (cClrBits <= 4)
cClrBits = 4;
else if (cClrBits <= 8)
cClrBits = 8;
else if (cClrBits <= 16)
cClrBits = 16;
else if (cClrBits <= 24)
cClrBits = 24;
else cClrBits = 32;

// Allocate memory for the BITMAPINFO structure. (This structure
// contains a BITMAPINFOHEADER structure and an array of RGBQUAD
// data structures.)

if (cClrBits != 24)
pbmi = (PBITMAPINFO) LocalAlloc(LPTR,
sizeof(BITMAPINFOHEADER) +
sizeof(RGBQUAD) * (1<< cClrBits));

// There is no RGBQUAD array for the 24-bit-per-pixel format.

else
pbmi = (PBITMAPINFO) LocalAlloc(LPTR,
sizeof(BITMAPINFOHEADER));

// Initialize the fields in the BITMAPINFO structure.

pbmi->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
pbmi->bmiHeader.biWidth = bmp.bmWidth;
pbmi->bmiHeader.biHeight = bmp.bmHeight;
pbmi->bmiHeader.biPlanes = bmp.bmPlanes;
pbmi->bmiHeader.biBitCount = bmp.bmBitsPixel;
if (cClrBits < 24)
pbmi->bmiHeader.biClrUsed = (1<<cClrBits);

// If the bitmap is not compressed, set the BI_RGB flag.
pbmi->bmiHeader.biCompression = BI_RGB;

// Compute the number of bytes in the array of color
// indices and store the result in biSizeImage.
pbmi->bmiHeader.biSizeImage = (pbmi->bmiHeader.biWidth + 7) /8
* pbmi->bmiHeader.biHeight
cClrBits;
// Set biClrImportant to 0, indicating that all of the
// device colors are important.
pbmi->bmiHeader.biClrImportant = 0;
return pbmi;
}

The following example code defines a function that initializes the remaining structures, retrieves the array of palette indices, opens the file, copies the data, and closes the file.

void CreateBMPFile(HWND hwnd, LPTSTR pszFile, PBITMAPINFO pbi,
HBITMAP hBMP, HDC hDC)
{
HANDLE hf; // file handle
BITMAPFILEHEADER hdr; // bitmap file-header
PBITMAPINFOHEADER pbih; // bitmap info-header
LPBYTE lpBits; // memory pointer
DWORD dwTotal; // total count of bytes
DWORD cb; // incremental count of bytes
BYTE *hp; // byte pointer
DWORD dwTmp;

pbih = (PBITMAPINFOHEADER) pbi;
lpBits = (LPBYTE) GlobalAlloc(GMEM_FIXED, pbih->biSizeImage);

if (!lpBits)
errhandler("GlobalAlloc", hwnd);

// Retrieve the color table (RGBQUAD array) and the bits
// (array of palette indices) from the DIB.
if (!GetDIBits(hDC, hBMP, 0, (WORD) pbih->biHeight, lpBits, pbi,
DIB_RGB_COLORS))
{
errhandler("GetDIBits", hwnd);
}

// Create the .BMP file.
hf = CreateFile(pszFile,
GENERIC_READ | GENERIC_WRITE,
(DWORD) 0,
NULL,
CREATE_ALWAYS,
FILE_ATTRIBUTE_NORMAL,
(HANDLE) NULL);
if (hf == INVALID_HANDLE_VALUE)
errhandler("CreateFile", hwnd);
hdr.bfType = 0x4d42; // 0x42 = "B" 0x4d = "M"
// Compute the size of the entire file.
hdr.bfSize = (DWORD) (sizeof(BITMAPFILEHEADER) +
pbih->biSize + pbih->biClrUsed
* sizeof(RGBQUAD) + pbih->biSizeImage);
hdr.bfReserved1 = 0;
hdr.bfReserved2 = 0;

// Compute the offset to the array of color indices.
hdr.bfOffBits = (DWORD) sizeof(BITMAPFILEHEADER) +
pbih->biSize + pbih->biClrUsed
* sizeof (RGBQUAD);

// Copy the BITMAPFILEHEADER into the .BMP file.
if (!WriteFile(hf, (LPVOID) &hdr, sizeof(BITMAPFILEHEADER),
(LPDWORD) &dwTmp, NULL))
{
errhandler("WriteFile", hwnd);
}

// Copy the BITMAPINFOHEADER and RGBQUAD array into the file.
if (!WriteFile(hf, (LPVOID) pbih, sizeof(BITMAPINFOHEADER)
+ pbih->biClrUsed * sizeof (RGBQUAD),
(LPDWORD) &dwTmp, ( NULL))
errhandler("WriteFile", hwnd);

// Copy the array of color indices into the .BMP file.
dwTotal = cb = pbih->biSizeImage;
hp = lpBits;
if (!WriteFile(hf, (LPSTR) hp, (int) cb, (LPDWORD) &dwTmp,NULL))
errhandler("WriteFile", hwnd);

// Close the .BMP file.
if (!CloseHandle(hf))
errhandler("CloseHandle", hwnd);

// Free memory.
GlobalFree((HGLOBAL)lpBits);
}

以上可以作为参考

CandyCat 2001-02-28

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那么，用这个函数能够把所有的bitmap都读出来吗?包括头信息吗？

tlovexyj 2001-02-27

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CBitmap.GetBitmapBits

各位高手，我该怎么办呢？在程序中我想把两个CBitmap实例存为一个文件...

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