在WR中调用DLL 截屏函数的问题

李文 · 发表于 2006-7-12 15:08:06

用VC弄了个关于截屏的Dll程序，但是在WR中运行时总是跑不通，希望高手指点，具体代码如下:
// CutScreenDll.cpp : Defines the initialization routines for the DLL.
//

#include "stdafx.h"
#include <afxdllx.h>
#include<iostream>
#include <string>
using namespace std;

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

static AFX_EXTENSION_MODULE CutScreenDllDLL = { NULL, NULL };

extern "C" int APIENTRY
DllMain(HINSTANCE hInstance, DWORD dwReason, LPVOID lpReserved)
{
// Remove this if you use lpReserved
UNREFERENCED_PARAMETER(lpReserved);

if (dwReason == DLL_PROCESS_ATTACH)
{
TRACE0("CUTSCREENDLL.DLL Initializing!\n");

// Extension DLL one-time initialization
if (!AfxInitExtensionModule(CutScreenDllDLL, hInstance))
return 0;

// Insert this DLL into the resource chain
// NOTE: If this Extension DLL is being implicitly linked to by
//  an MFC Regular DLL (such as an ActiveX Control)
//  instead of an MFC application, then you will want to
//  remove this line from DllMain and put it in a separate
//  function exported from this Extension DLL.  The Regular DLL
//  that uses this Extension DLL should then explicitly call that
//  function to initialize this Extension DLL.  Otherwise,
//  the CDynLinkLibrary object will not be attached to the
//  Regular DLL's resource chain, and serious problems will
//  result.

new CDynLinkLibrary(CutScreenDllDLL);
}
else if (dwReason == DLL_PROCESS_DETACH)
{
TRACE0("CUTSCREENDLL.DLL Terminating!\n");
// Terminate the library before destructors are called
AfxTermExtensionModule(CutScreenDllDLL);
}
return 1; // ok
}

void Screen(char filename[])
{

CDC *pDC;//屏幕DC
pDC = CDC::FromHandle(GetDC(NULL));//获取当前整个屏幕DC
int BitPerPixel = pDC->GetDeviceCaps(BITSPIXEL);//获得颜色模式
int Width = pDC->GetDeviceCaps(HORZRES);
int Height = pDC->GetDeviceCaps(VERTRES);

cout << "当前屏幕色彩模式为" << BitPerPixel << "位色彩" << endl
<< "屏幕宽度：" << Width << endl
<< "屏幕高度：" << Height << endl << endl;

CDC memDC;//内存DC
memDC.CreateCompatibleDC(pDC);

CBitmap memBitmap, *oldmemBitmap;//建立和屏幕兼容的bitmap
memBitmap.CreateCompatibleBitmap(pDC, Width, Height);

oldmemBitmap = memDC.SelectObject(&memBitmap);//将memBitmap选入内存DC
memDC.BitBlt(0, 0, Width, Height, pDC, 0, 0, SRCCOPY);//复制屏幕图像到内存DC

//以下代码保存memDC中的位图到文件
BITMAP bmp;
memBitmap.GetBitmap(&bmp);//获得位图信息

FILE *fp = fopen(filename, "w+b");

BITMAPINFOHEADER bih = {0};//位图信息头
bih.biBitCount = bmp.bmBitsPixel;//每个像素字节大小
bih.biCompression = BI_RGB;
bih.biHeight = bmp.bmHeight;//高度
bih.biPlanes = 1;
bih.biSize = sizeof(BITMAPINFOHEADER);
bih.biSizeImage = bmp.bmWidthBytes * bmp.bmHeight;//图像数据大小
bih.biWidth = bmp.bmWidth;//宽度

BITMAPFILEHEADER bfh = {0};//位图文件头
bfh.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);//到位图数据的偏移量
bfh.bfSize = bfh.bfOffBits + bmp.bmWidthBytes * bmp.bmHeight;//文件总的大小
bfh.bfType = (WORD)0x4d42;

fwrite(&bfh, 1, sizeof(BITMAPFILEHEADER), fp);//写入位图文件头

fwrite(&bih, 1, sizeof(BITMAPINFOHEADER), fp);//写入位图信息头

byte * p = new byte[bmp.bmWidthBytes * bmp.bmHeight];//申请内存保存位图数据

GetDIBits(memDC.m_hDC, (HBITMAP) memBitmap.m_hObject, 0, Height, p,
(LPBITMAPINFO) &bih, DIB_RGB_COLORS);//获取位图数据

fwrite(p, 1, bmp.bmWidthBytes * bmp.bmHeight, fp);//写入位图数据

delete [] p;

fclose(fp);

memDC.SelectObject(oldmemBitmap);
}

wr中的代码
load_dll("E:\\VC\\CutScreenDll\\Debug\\CutScreenDll.dll");
filename[0]="a";
extern int Screen(filename);#跑到这里出现如图所示提示框

Screen(filename);//调用Screen函数

unload_dll("E:\\VC\\CutScreenDll\\Debug\\CutScreenDll.dll");

G:\Snap3.bmp

flying-kite · 发表于 2010-11-9 13:01:26

有人提到: 为什么不用自带的WR函数win_capture_bitmap呢?

贝壳里的海 · 发表于 2009-11-23 15:28:11

我是自己录制了一个脚本，在测试软件的时候同时激活红蜻蜓抓图精灵，用这个软件的截屏功能来截屏

shuishixingyu · 发表于 2008-4-7 10:13:14

好东西

byya · 发表于 2008-3-21 16:53:31

的確可以用..不借..速度很快...這樣有錯誤時可以自動截圖...這功能好

byya · 发表于 2008-3-21 16:47:29

我把DLL編譯了
看看能不能用

[ 本帖最后由 byya 于 2008-3-21 17:09 编辑 ]

李文 · 发表于 2006-7-21 13:42:56

通过大家的帮助，代码这下子可以用了sdlkfj2，
// CutScreenDll.cpp : Defines the initialization routines for the DLL.
//

#include "stdafx.h"
#include <afxdllx.h>
#include<iostream>
#include <string>
using namespace std;

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

static AFX_EXTENSION_MODULE CutScreenDllDLL = { NULL, NULL };

extern "C" int APIENTRY
DllMain(HINSTANCE hInstance, DWORD dwReason, LPVOID lpReserved)
{
// Remove this if you use lpReserved
UNREFERENCED_PARAMETER(lpReserved);

if (dwReason == DLL_PROCESS_ATTACH)
{
TRACE0("CUTSCREENDLL.DLL Initializing!\n");

// Extension DLL one-time initialization
if (!AfxInitExtensionModule(CutScreenDllDLL, hInstance))
return 0;

// Insert this DLL into the resource chain
// NOTE: If this Extension DLL is being implicitly linked to by
//  an MFC Regular DLL (such as an ActiveX Control)
//  instead of an MFC application, then you will want to
//  remove this line from DllMain and put it in a separate
//  function exported from this Extension DLL.  The Regular DLL
//  that uses this Extension DLL should then explicitly call that
//  function to initialize this Extension DLL.  Otherwise,
//  the CDynLinkLibrary object will not be attached to the
//  Regular DLL's resource chain, and serious problems will
//  result.

new CDynLinkLibrary(CutScreenDllDLL);
}
else if (dwReason == DLL_PROCESS_DETACH)
{
TRACE0("CUTSCREENDLL.DLL Terminating!\n");
// Terminate the library before destructors are called
AfxTermExtensionModule(CutScreenDllDLL);
}
return 1; // ok
}

extern"C" __declspec(dllexport) void Screen(char *filename)
{

CDC *pDC;//屏幕DC
pDC = CDC::FromHandle(GetDC(NULL));//获取当前整个屏幕DC
int BitPerPixel = pDC->GetDeviceCaps(BITSPIXEL);//获得颜色模式
int Width = pDC->GetDeviceCaps(HORZRES);
int Height = pDC->GetDeviceCaps(VERTRES);

CDC memDC;//内存DC
memDC.CreateCompatibleDC(pDC);

CBitmap memBitmap, *oldmemBitmap;//建立和屏幕兼容的bitmap
memBitmap.CreateCompatibleBitmap(pDC, Width, Height);

oldmemBitmap = memDC.SelectObject(&memBitmap);//将memBitmap选入内存DC
memDC.BitBlt(0, 0, Width, Height, pDC, 0, 0, SRCCOPY);//复制屏幕图像到内存DC

//以下代码保存memDC中的位图到文件
BITMAP bmp;
memBitmap.GetBitmap(&bmp);//获得位图信息

FILE *fp = fopen(filename, "w+b");

BITMAPINFOHEADER bih = {0};//位图信息头
bih.biBitCount = bmp.bmBitsPixel;//每个像素字节大小
bih.biCompression = BI_RGB;
bih.biHeight = bmp.bmHeight;//高度
bih.biPlanes = 1;
bih.biSize = sizeof(BITMAPINFOHEADER);
bih.biSizeImage = bmp.bmWidthBytes * bmp.bmHeight;//图像数据大小
bih.biWidth = bmp.bmWidth;//宽度

BITMAPFILEHEADER bfh = {0};//位图文件头
bfh.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);//到位图数据的偏移量
bfh.bfSize = bfh.bfOffBits + bmp.bmWidthBytes * bmp.bmHeight;//文件总的大小
bfh.bfType = (WORD)0x4d42;

fwrite(&bfh, 1, sizeof(BITMAPFILEHEADER), fp);//写入位图文件头

fwrite(&bih, 1, sizeof(BITMAPINFOHEADER), fp);//写入位图信息头

byte * p = new byte[bmp.bmWidthBytes * bmp.bmHeight];//申请内存保存位图数据

GetDIBits(memDC.m_hDC, (HBITMAP) memBitmap.m_hObject, 0, Height, p,
(LPBITMAPINFO) &bih, DIB_RGB_COLORS);//获取位图数据

fwrite(p, 1, bmp.bmWidthBytes * bmp.bmHeight, fp);//写入位图数据

delete [] p;

fclose(fp);

memDC.SelectObject(oldmemBitmap);

}

WR中的代码：
extern  int Screen(string filename);
load_dll("E:\\VC\\CutScreenDll\\Debug\\CutScreenDll.dll");
Screen("d:\\bmp.bmp");

unload_dll("E:\\VC\\CutScreenDll\\Debug\\CutScreenDll.dll");

李文 · 发表于 2006-7-20 11:27:39

谢谢大家啊，我先调试一下，要是好使这段代码大家就可以一起使用了啊

jbmw_dzg · 发表于 2006-7-18 22:11:44

另外,你的filename因该是个文件名吧，在WR不能像你那样调用
你应该这样
static filename;
filename="c:\1.bmp"
然后调用函数

jbmw_dzg · 发表于 2006-7-18 22:07:31

楼上的,再你的wr中重新声名你的函数 extern int Screen( in string filename);

shyfish · 发表于 2006-7-18 20:32:39

如果DLL没问题那把WR 的 extern函数改下:
extern extern int Screen(in string); // 如果不修改, 如果要输出, inout 代替 in
给个链接:
http://bbs.51testing.com/viewthr ... p;highlight=shyfish

MFC写的DLL完全可用, 而且简单(导出函数使用引用都可以). 用作辅助WR很好啊

[ 本帖最后由 51Testing论坛于 2008-4-22 23:08 编辑 ]