在Windows操作系统中,当用户按下"PrintScreen"按钮后,Windows自动将当前屏幕的图像拷贝到系统剪贴板中,这时可以通过"画笔"这个小程序将剪贴板中的内容保存成图像文件,可以看出,如果需要将当前屏幕保存下来还是比较麻烦的,能否可以自己编写一个应用程序,自动将当前屏幕的内容保存到一个图像文件中去呢?这个答案是肯定的,本实例应用程序就是利用通用的热键管理DLL库实现的热键功能,在收到热键通知后截取屏幕的内容并保存到bmp文件中。例如我们设置图片保存路径为c:\,热键为F9 + Control,然后按Change按钮设置好热键,那么当我们按下CTRL+F9后,当前界面将以BMP图像文件的格式被保存在C:\目录下。程序编译运行后的界面效果如图一所示:
moZeP#Q%
[I7=]X 一、实现方法
.9UrWBW\I E
H|L1g 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
0-/@-qV\ B[t>T>~ #pragma data_seg("shareddata")
sH]T1z HHOOK hHook =NULL; //钩子句柄
LZQG. UINT nHookCount =0; //挂接的程序数目
?A-f_0<0 static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
Nv3u)?A3w static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
[&(~1C|C static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
m[BpV.s static int KeyCount =0;
~g;)8X;;+ static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
1-Dw-./N #pragma data_seg()
r~2q`l'> {Q@?CT 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
x{/-&`F hBhbcWD,ka DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
*w}r:04F G"".;}AV BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
j3u!lZ}U cKey,UCHAR cMask)
*w/N>:V0p {
NLUiNfCR BOOL bAdded=FALSE;
Iz>\qC} for(int index=0;index<MAX_KEY;index++){
Y=y
0`?K if(hCallWnd[index]==0){
.:e#!~Ki hCallWnd[index]=hWnd;
p(9[*0.}; HotKey[index]=cKey;
qggRS)a HotKeyMask[index]=cMask;
IYa(B+nB) bAdded=TRUE;
e*d lGK3l KeyCount++;
dJlK'zK break;
U8@P/Z9 }
MPF({Pnx7 }
8<@X=Z return bAdded;
qxYCT$1 }
s4 Vju/ //删除热键
OF:0jOW
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
6o*'Q8h {
G&4D0f BOOL bRemoved=FALSE;
-OnKvpeI for(int index=0;index<MAX_KEY;index++){
wNUcL*n if(hCallWnd[index]==hWnd){
d@zxgn7o if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
fB'Jo<C hCallWnd[index]=NULL;
qOa*JA` HotKey[index]=0;
a>+m_]*JZ HotKeyMask[index]=0;
n#B}p*G bRemoved=TRUE;
w4zp%`?D' KeyCount--;
LLMGs: [ break;
'R99m?" }
6z'0fi|EN }
77j"zr7v
}
C:f^&4
3 return bRemoved;
_,I~1" }
'Zqt~5=5 &v Q5+ 5glEV`.je DLL中的钩子函数如下:
g4;|uK; f lt'~fe LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
uLNOhgSUf {
4w]<1V BOOL bProcessed=FALSE;
/AYq^ if(HC_ACTION==nCode)
K<WowU {
=l6WO* if((lParam&0xc0000000)==0xc0000000){// 有键松开
"hZ `^"0b switch(wParam)
9NZq
k {
b{X.lz0 case VK_MENU:
rA@|nL{ MaskBits&=~ALTBIT;
NdRE,HWd?$ break;
q6x}\$mL case VK_CONTROL:
JIc9csr:b MaskBits&=~CTRLBIT;
@]42.oP break;
8:uh0 case VK_SHIFT:
:_+U[k(# MaskBits&=~SHIFTBIT;
K9K.mGYc break;
m |.0$+= default: //judge the key and send message
ISTAJ8"
D break;
$"#M:V@ }
OT"j V for(int index=0;index<MAX_KEY;index++){
B%o%%A8*g if(hCallWnd[index]==NULL)
?zVcP=p@ continue;
dkSd
Y+Q if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
)]Sf|@K] {
v[?gM.SF SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
9<"F3F0| bProcessed=TRUE;
auM1k] }
7
Rc/<,X }
?q0a^c?A^ }
nhd.c2t\ else if((lParam&0xc000ffff)==1){ //有键按下
M3dUGM switch(wParam)
"u{ymJ]t {
E;"VI2F case VK_MENU:
0/cgOP!^ MaskBits|=ALTBIT;
6vzvH break;
)ub!tm case VK_CONTROL:
mXsSOAD< MaskBits|=CTRLBIT;
5bol)Z9BO break;
YeB C6`7y case VK_SHIFT:
{yi!vw MaskBits|=SHIFTBIT;
'%YTMN@ break;
0t*PQ% default: //judge the key and send message
Ad-_=a% break;
!L_xcov!Y }
[G[{?{ for(int index=0;index<MAX_KEY;index++){
BL%&n*& if(hCallWnd[index]==NULL)
TaKCN continue;
"`'+@KlE if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
.RS {
[T,Df& SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
$0]5b{i] bProcessed=TRUE;
9N|JI3*41 }
Eh"Y<]$ }
?pA_/wwp }
B E#pHg if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
"#{b)!EH for(int index=0;index<MAX_KEY;index++){
3;!a'[W&p if(hCallWnd[index]==NULL)
/N@NT/.M< continue;
SO~pe$c- if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
Yt r*"- SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
H
'nLC, //lParam的意义可看MSDN中WM_KEYDOWN部分
9mpQusM }
>as+#rz1p }
[y<s]C6E }
hG}/o&}U return CallNextHookEx( hHook, nCode, wParam, lParam );
!
e?=g%( }
%H}M[_f 2 m72PU<. 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
.0|_J|{ C ?\HB#41 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
475jmQ{q BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
viVn u4[JDB7tH 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
XW{cC`&
#O'g*]j LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
YKx+z[A/p {
_ CzAv% if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
aecvz0}@R {
EE qlsH //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
q"LT 8nD\ SaveBmp();
6-nf+!#G return FALSE;
uYd_5
nw }
g~OG~g@ …… //其它处理及默认处理
x+1-^XvK }
LC0-O1 |J^I8gx+ hiWs:Yq 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
ZjnWbnW O:dUzZR[' 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
7[}WvfN8# ~ \c
j 二、编程步骤
pFwe&_u] AUl[h&s 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
mNX0BZ 1DF8-|+ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
X)8Edw[?N3 i2\CDYP 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
Lf8{']3 &7c #i 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
tTJ$tx <-Ax)zE 5、 添加代码,编译运行程序。
@$wfE\_L TI7)yxa=` 三、程序代码
W'Qy4bl7C |@)jS.Bn ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
{_4zm& #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
n$"BF\eM #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
!,*Uvs@b #if _MSC_VER > 1000
2}ywNVS #pragma once
j9=)^? #endif // _MSC_VER > 1000
v)'Uoe"R% #ifndef __AFXWIN_H__
@9MrTP #error include 'stdafx.h' before including this file for PCH
EFs\zWF #endif
4ug4[ #include "resource.h" // main symbols
j!a&l class CHookApp : public CWinApp
|:d_IB@ {
?gXdi<2Qn public:
QRER[8]r$ CHookApp();
m9Dg%\B // Overrides
"+BuFhSLf // ClassWizard generated virtual function overrides
D\sh
+}" //{{AFX_VIRTUAL(CHookApp)
BagV\\#v4 public:
V> Nw2u!! virtual BOOL InitInstance();
1sfs!b&E virtual int ExitInstance();
' PmBNT //}}AFX_VIRTUAL
~hU^5R-% //{{AFX_MSG(CHookApp)
:NWrbfz // NOTE - the ClassWizard will add and remove member functions here.
83{v_M // DO NOT EDIT what you see in these blocks of generated code !
@OC*:?!4 //}}AFX_MSG
?:RWHe.P DECLARE_MESSAGE_MAP()
c5{3 };
8p~|i97W]! LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
By0Zz BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
8noo^QO BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
xllmF)]*Y BOOL InitHotkey();
7L!q{%} BOOL UnInit();
;B"S*wYMN #endif
&F +hh{ {^K&9sz //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
e73zpF #include "stdafx.h"
iP?=5j=4 #include "hook.h"
p2m`pT #include <windowsx.h>
et6@);F #ifdef _DEBUG
it=ir9 #define new DEBUG_NEW
/6p7k #undef THIS_FILE
wpm $?X static char THIS_FILE[] = __FILE__;
5%R$7>`Z #endif
*&W1|Qkg_ #define MAX_KEY 100
Dn;$4Dak( #define CTRLBIT 0x04
y Xi$w.gr #define ALTBIT 0x02
TK%MVL TK #define SHIFTBIT 0x01
5U(ry6fI= #pragma data_seg("shareddata")
A#w*r-P HHOOK hHook =NULL;
O,7*dniH UINT nHookCount =0;
H=_k|#/ static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
Eb\SK"8 static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
IN!IjInaT@ static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
Je~<2EsQ static int KeyCount =0;
%XZdz=B static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
0I>[rxal #pragma data_seg()
m?<5-"hz HINSTANCE hins;
|_wbxdq void VerifyWindow();
`"j _] BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
Iy{&T#e" //{{AFX_MSG_MAP(CHookApp)
XFvPc // NOTE - the ClassWizard will add and remove mapping macros here.
eX{Tyd{ // DO NOT EDIT what you see in these blocks of generated code!
ixo?o]Xb` //}}AFX_MSG_MAP
`z`"0;,7S END_MESSAGE_MAP()
<ApzcyC
_l](dqyuN( CHookApp::CHookApp()
n6
AP6PK7 {
b/'RJQSAc // TODO: add construction code here,
VW\~OH // Place all significant initialization in InitInstance
/%h<^YDBf }
1V 2"sE nsV;6^> CHookApp theApp;
}G[Qm2k LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
9vz"rHV {
~ny4Ay$# BOOL bProcessed=FALSE;
{@`Z`h"N if(HC_ACTION==nCode)
+8q]O%B
{
5TcirVO82 if((lParam&0xc0000000)==0xc0000000){// Key up
+J%9%DqF switch(wParam)
'B$qq[l]S {
E.OL_ \ case VK_MENU:
q|ww fPez7 MaskBits&=~ALTBIT;
R9V v*F]m@ break;
v8o{3wJ case VK_CONTROL:
(]p,Z<f MaskBits&=~CTRLBIT;
swT/
tesj break;
1\BQq case VK_SHIFT:
0%<x>O MaskBits&=~SHIFTBIT;
%$I@7Es> break;
{afR?3GK default: //judge the key and send message
qUF}rlS=r break;
iKuSk~ }
NhA_dskvo for(int index=0;index<MAX_KEY;index++){
3_+$x4% if(hCallWnd[index]==NULL)
[#6Eax,j continue;
^H
UNq[sQ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
X'h
J&-[P {
w>$2 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
@-Js)zcl q bProcessed=TRUE;
m>@ *-*8k }
O&u[^s/^ }
dzPwlCC%- }
Z 2u5n`K else if((lParam&0xc000ffff)==1){ //Key down
w6[uM%fHG switch(wParam)
#97w6,P+ {
f_GqJ7Gk] case VK_MENU:
6@@J>S> MaskBits|=ALTBIT;
H{3A6fb< break;
:If1zB) case VK_CONTROL:
wWR9dsB.; MaskBits|=CTRLBIT;
@9<MW break;
`FL!L59nz case VK_SHIFT:
RtVG6'Y MaskBits|=SHIFTBIT;
C@i4[g){ break;
#x;i R8^ default: //judge the key and send message
' |> break;
{`vv-[j| }
Q+UqLass for(int index=0;index<MAX_KEY;index++)
lnoK.Vk9, {
]OKs65 if(hCallWnd[index]==NULL)
vo_m$ /O continue;
#(G#O1+ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
e8"?Qm7 J {
GY%48}7 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
.oFkx*Ln bProcessed=TRUE;
>>C(y?g }
@<
@\CiM }
^q0Ox&X }
$pm5G} . if(!bProcessed){
[LJ1wBMw for(int index=0;index<MAX_KEY;index++){
T};fy+iq if(hCallWnd[index]==NULL)
Be(h x continue;
Jm+;A^; if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
;8
D31OT SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
,!?&LdPt> }
k )T;WCia }
wZA(><\ }
sKT GZA return CallNextHookEx( hHook, nCode, wParam, lParam );
)0I;+9:D= }
mw1|>*X&R kU5chltGF BOOL InitHotkey()
wv8WqYV {
si nnHQ if(hHook!=NULL){
\)pT+QxZ nHookCount++;
|-c)OS3#D return TRUE;
/~Q2SrYH }
Q!<b"8V] else
qUY QN2wG hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
g6kVHxh- if(hHook!=NULL)
N| dwuBW nHookCount++;
BEkxH. return (hHook!=NULL);
e!67Na0X( }
9
L{JU BOOL UnInit()
NyTv~8A`) {
0b0.xz\~U if(nHookCount>1){
&?=UP4[oif nHookCount--;
d&x1uso%L return TRUE;
5};Nv{km^2 }
%hzl3>(). BOOL unhooked = UnhookWindowsHookEx(hHook);
x7=5 ;gf/X if(unhooked==TRUE){
rQ^$)%uP nHookCount=0;
Ub8|x]ix hHook=NULL;
DV(^h$1_ }
Gmi w(T return unhooked;
-$#' }
OE(Z)|LF U!L<v!$ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
e?%Qv+)W {
=Zcbfo_& BOOL bAdded=FALSE;
$ 4\,a^ for(int index=0;index<MAX_KEY;index++){
bojx:g if(hCallWnd[index]==0){
q1Vh]d hCallWnd[index]=hWnd;
*OT6)]|k HotKey[index]=cKey;
FL+^r6DQ HotKeyMask[index]=cMask;
.FS`Fh; bAdded=TRUE;
:66xrw KeyCount++;
_
FcfNF break;
{"dU?/d }
E.$1CGd+ }
C%8jWc return bAdded;
?\C7.of }
dHnR)[?e \7QAk4I~ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
R <+K&_ {
2G'Au} q0n BOOL bRemoved=FALSE;
wD-(3ZVd4 for(int index=0;index<MAX_KEY;index++){
aO9a G*9T if(hCallWnd[index]==hWnd){
Z?H#=|U if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
,ufB*[~ hCallWnd[index]=NULL;
GVT+c@Gx
HotKey[index]=0;
*%^Vq HotKeyMask[index]=0;
iol.RszlZ| bRemoved=TRUE;
URbu=U KeyCount--;
DS,"^K break;
}5Yd:%u5 }
jFBLElE }
_e<3 g9bj }
p.9VyM return bRemoved;
beyC't }
Farcd!} 8S_i; void VerifyWindow()
#\kYGr-G) {
2YD;Gb[8 for(int i=0;i<MAX_KEY;i++){
tl |Qw";I if(hCallWnd
!=NULL){ Zk*/~f|\
if(!IsWindow(hCallWnd)){ Cf'O*RFD
hCallWnd=NULL; 8-Ik .,}
HotKey=0; je6H}eWTC6
HotKeyMask=0; vDgf}
KeyCount--; :^+ aJ]
} &[*F!=%8
} tkBp?Wl
} 0p\cDrB?
} ^Jb=&u$
zK`z*\
BOOL CHookApp::InitInstance() iq> PN:mr
{ ~U+SK4SK:o
AFX_MANAGE_STATE(AfxGetStaticModuleState()); ;Ub;AqY
hins=AfxGetInstanceHandle(); /
lh3.\|
InitHotkey(); KS($S(Fi
return CWinApp::InitInstance();
9K*yds
} oR'8|~U@B
hX\z93an
int CHookApp::ExitInstance() yDBS :
\
{ KUG\C\z6=
VerifyWindow(); =p 9d4smbn
UnInit(); @#q>(Ox%
return CWinApp::ExitInstance(); ;EZ$8|
} +Z0@z^6\
DN)Ehd.
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Wb:jZ
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) *rPUVhD_
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ V
QE *B
#if _MSC_VER > 1000 TY[{)aH{S
#pragma once RX.n7Tb
#endif // _MSC_VER > 1000 qP<wf=wY
f.ku v"
class CCaptureDlg : public CDialog "Gx(-NH+
{ y>T:fu
// Construction b&s"/Y89
public: wjGD[~mB
BOOL bTray; YNCQPN\v`1
BOOL bRegistered; s^Lg*t3I
BOOL RegisterHotkey(); n:cre}0.
UCHAR cKey; !\.%^LK1
UCHAR cMask; n gA&PU
void DeleteIcon(); V=}AFGC85
void AddIcon(); $i&u\iL
UINT nCount; "*O(3L.c-
void SaveBmp(); epa)~/sA
CCaptureDlg(CWnd* pParent = NULL); // standard constructor fI@4 v\
// Dialog Data &UtsI@Mu
//{{AFX_DATA(CCaptureDlg) {f;]
enum { IDD = IDD_CAPTURE_DIALOG }; 9mW95YI S
CComboBox m_Key; / $7E
BOOL m_bControl; $Il?[4FF
BOOL m_bAlt; ~Aul 7[IH
BOOL m_bShift; a>jiq8d]4
CString m_Path; Y#Pl)sRr
CString m_Number; ndEW$?W,
//}}AFX_DATA 1PLxc)LsG
// ClassWizard generated virtual function overrides <
&[=,R0 @
//{{AFX_VIRTUAL(CCaptureDlg) FZTBvdUYp
public: *I7$\0Q
virtual BOOL PreTranslateMessage(MSG* pMsg); dx{ZG'@aH
protected: yD6lzuk{X
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support S<"T:Y&
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); _h1n]@
d5
//}}AFX_VIRTUAL KTX;x2r
// Implementation s,UccA@
protected: cTf/B=yMi
HICON m_hIcon; 6|*em4
// Generated message map functions gZQ,br*
//{{AFX_MSG(CCaptureDlg) T\\Q!pY
virtual BOOL OnInitDialog(); wmh[yYWc
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); :|i jCg+
afx_msg void OnPaint(); umV5Y`
afx_msg HCURSOR OnQueryDragIcon(); S EdNH.|I
virtual void OnCancel(); FFGG6r
afx_msg void OnAbout(); G%N3h'zDi
afx_msg void OnBrowse(); VHhW_ya1g{
afx_msg void OnChange(); H6Q1r[(B
//}}AFX_MSG %,Fx qw
DECLARE_MESSAGE_MAP() ][R#Q;y<
}; NQCJ '%L6
#endif wIT0A-Por4
NYbeIfL
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 4#H~g
@
#include "stdafx.h" $agd9z,&m
#include "Capture.h" r9@4-U7v&
#include "CaptureDlg.h" B 14Ziopww
#include <windowsx.h> V 4Y w"J
#pragma comment(lib,"hook.lib") h\GlyH~
#ifdef _DEBUG h?H:r <
#define new DEBUG_NEW G
@ib
#undef THIS_FILE J}IHQZS
static char THIS_FILE[] = __FILE__; lqPzDdC^>
#endif gKK*`
L~
#define IDM_SHELL WM_USER+1 )sg@HFhY'
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); !Oj].
WQ
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); H% c:f
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; D&KD5_Sw
class CAboutDlg : public CDialog iYE:o{
{ 9(`d
h
public: i^LLKx7M&
CAboutDlg(); kI5`[\
// Dialog Data Y{~[N y E
//{{AFX_DATA(CAboutDlg) 78't"2>
enum { IDD = IDD_ABOUTBOX }; Ys |n9pW
//}}AFX_DATA `em}vdY
// ClassWizard generated virtual function overrides a!ao{8#
//{{AFX_VIRTUAL(CAboutDlg) "?E>rWz
protected: jcNYW_G
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 5AV5`<r.
//}}AFX_VIRTUAL P~Cx#`#(V
// Implementation ~4YU
protected: f,utA3[
//{{AFX_MSG(CAboutDlg) *^]Hqf(`
//}}AFX_MSG <4!SQgL
DECLARE_MESSAGE_MAP() Z["[^=EP
}; JY4sB8
A8bDg:G1i
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ;E? Z<3{
{ ]=T`8)_r)
//{{AFX_DATA_INIT(CAboutDlg) k.b->U
//}}AFX_DATA_INIT DpG|Kl|d
} Y0`=h"g
\%fl`+`
void CAboutDlg::DoDataExchange(CDataExchange* pDX) EMyMed_
{ "/v{B?~%!
CDialog::DoDataExchange(pDX); ~4HS
2\
//{{AFX_DATA_MAP(CAboutDlg) *z-Mr~V
//}}AFX_DATA_MAP 'urn5[i
} Jr/|nhGl5
4N&4TUIM
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) L[4Su;D
//{{AFX_MSG_MAP(CAboutDlg) Ji<^s@8Zc
// No message handlers u_+64c_7
//}}AFX_MSG_MAP /(#;(]
END_MESSAGE_MAP() gWcl@|I;\
$ekJs/I&
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) qi!Nv$e
: CDialog(CCaptureDlg::IDD, pParent) [o]^\ay
{ mx`C6G5
//{{AFX_DATA_INIT(CCaptureDlg) 4c"x&x|
m_bControl = FALSE; h`X>b/V
m_bAlt = FALSE; ;{xk[fm=
m_bShift = FALSE; rp*f)rJ
m_Path = _T("c:\\"); C^sHj5\(
m_Number = _T("0 picture captured."); c#lW ?
nCount=0; NY.Y=CF("
bRegistered=FALSE; 7aAT
bTray=FALSE; R7xKVS_MP
//}}AFX_DATA_INIT @I{v
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 }*4K{<02
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); G,+-}~ $_
} L`>uO1O
7]}n0*fe
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) \nQV{J
{ l (;~9u0sa
CDialog::DoDataExchange(pDX); {Vy2uow0
//{{AFX_DATA_MAP(CCaptureDlg) }cDw9;~D
DDX_Control(pDX, IDC_KEY, m_Key); laVqI|0q
DDX_Check(pDX, IDC_CONTROL, m_bControl); [v7)xV@c
DDX_Check(pDX, IDC_ALT, m_bAlt); !?t#QDo
DDX_Check(pDX, IDC_SHIFT, m_bShift); dW
hU
o\>=
DDX_Text(pDX, IDC_PATH, m_Path); >l|ao&z>bm
DDX_Text(pDX, IDC_NUMBER, m_Number); zd1X(e<|{
//}}AFX_DATA_MAP "YY6_qQR'
} o[C,fh,$
}Yd7<"kp
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) eJWcrVpn
//{{AFX_MSG_MAP(CCaptureDlg) /b3b0VfF
ON_WM_SYSCOMMAND() \^7D%a=;C
ON_WM_PAINT() l;TWs_N
ON_WM_QUERYDRAGICON() +:@lde]/p
ON_BN_CLICKED(ID_ABOUT, OnAbout) GabYxYK
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 9d7`R'
ON_BN_CLICKED(ID_CHANGE, OnChange) RRGo$
//}}AFX_MSG_MAP mj\]oWS7d
END_MESSAGE_MAP() !RX7TYf
G[34:J
BOOL CCaptureDlg::OnInitDialog() ;|(_;d
{ [l;9](\8O
CDialog::OnInitDialog(); >z&|<H%
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); )n8(U%q$
ASSERT(IDM_ABOUTBOX < 0xF000); !JZ)6mtlr
CMenu* pSysMenu = GetSystemMenu(FALSE); 4.?tP7UE
if (pSysMenu != NULL) \[m{ &%^G
{ FdT@}
CString strAboutMenu; $LxfdSa
strAboutMenu.LoadString(IDS_ABOUTBOX); ;MD6iBD
if (!strAboutMenu.IsEmpty()) DI/yHs
{ 5i 56J1EC
pSysMenu->AppendMenu(MF_SEPARATOR); QFn .<@
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); R $vo
} p#['CqP8
} J!l/!Z>!cF
SetIcon(m_hIcon, TRUE); // Set big icon }=)
SetIcon(m_hIcon, FALSE); // Set small icon zCOzBL/1q
m_Key.SetCurSel(0); g\%vkK&I
RegisterHotkey(); nP9zTa
CMenu* pMenu=GetSystemMenu(FALSE); ,MH9e!
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 9
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pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ]xO`c
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); +Usy
return TRUE; // return TRUE unless you set the focus to a control nJEm&"AI
} H}TzNs
0FL PZaRP
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) l Je=z
{ .W>LsEk
if ((nID & 0xFFF0) == IDM_ABOUTBOX) Aw]W- fx
{ r!DUsE
CAboutDlg dlgAbout; VK7lm|J+
dlgAbout.DoModal(); 3v oas
} y _Mte
else xp+Z%0D
{ (`z`ni
CDialog::OnSysCommand(nID, lParam); . 4$SNzv3V
} R?,O h*
} %<4ZU!2L
eVDO]5?
void CCaptureDlg::OnPaint() "qb1jv#to
{ "RZVv~BD
if (IsIconic()) >5,nB<
{ F(?A7
CPaintDC dc(this); // device context for painting d(LX;sq?
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); x>Hg.%/c[
// Center icon in client rectangle 6gUcoDD
int cxIcon = GetSystemMetrics(SM_CXICON); &y164xn'h
int cyIcon = GetSystemMetrics(SM_CYICON); s\7]"3:wD
CRect rect; 6xLLIby,
GetClientRect(&rect); '"#W!p
int x = (rect.Width() - cxIcon + 1) / 2; zUw=e}?:
int y = (rect.Height() - cyIcon + 1) / 2; e
MX?x7
// Draw the icon XeGtge/}T
dc.DrawIcon(x, y, m_hIcon); })zYo 7
} lwY2zX&%)/
else KW17CJ@
{ U_1syaY!
CDialog::OnPaint(); #q[k"x=c
} *^]lFuX\&E
} :fxG]uf-P
U9uy(KOW
HCURSOR CCaptureDlg::OnQueryDragIcon() ups]k?4
{
2aROY2
return (HCURSOR) m_hIcon; fu}ZOPu
} ^ Tr )gik
p3sR>ToJ
void CCaptureDlg::OnCancel() h[%t7qo=
{ 3%"r%:fQB/
if(bTray) bV'^0(Zv
DeleteIcon(); K6C@YY(
CDialog::OnCancel(); X`REhvT
} BKiyog
F_Pv\?35z
void CCaptureDlg::OnAbout() g;|3n&
{ _A[k&nO!&J
CAboutDlg dlg; @zz4,,]
dlg.DoModal(); hcQky/c\#b
} ,5tW|=0@
m^6& !`CD
void CCaptureDlg::OnBrowse() -Fl;;jeX
{ ?b}d"QsmU
CString str; 8&gr}r-
5
BROWSEINFO bi; #n9:8BKf
char name[MAX_PATH]; .BaU}-5
ZeroMemory(&bi,sizeof(BROWSEINFO)); )Ha`>
bi.hwndOwner=GetSafeHwnd(); "4 Lt:o4x
bi.pszDisplayName=name; dI[hQxU
bi.lpszTitle="Select folder"; , [V#o-Z
bi.ulFlags=BIF_RETURNONLYFSDIRS; %xa.{`}`U
LPITEMIDLIST idl=SHBrowseForFolder(&bi); GI]sE]tZ
if(idl==NULL) {$dq7m(
return; tEj-c@`"x-
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); \(S69@f
str.ReleaseBuffer(); W.B;Dy,Y
m_Path=str; |H.i$8_A
if(str.GetAt(str.GetLength()-1)!='\\')
2s+ITPr
m_Path+="\\"; >EMsBX
UpdateData(FALSE); .V4w+:i
} XN*?<s3
9:JFG{M
void CCaptureDlg::SaveBmp() Z9TUaMhF
{ Y?1
3_~
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CDC dc; o$S/EZ
dc.CreateDC("DISPLAY",NULL,NULL,NULL); fj/sN HU
CBitmap bm; Myal3UF
int Width=GetSystemMetrics(SM_CXSCREEN); 51,RbADB
int Height=GetSystemMetrics(SM_CYSCREEN); l6YToYzE2
bm.CreateCompatibleBitmap(&dc,Width,Height); fV 6$YCf
CDC tdc; QA=G+1x
tdc.CreateCompatibleDC(&dc); N2 vA/
CBitmap*pOld=tdc.SelectObject(&bm); _kgGz@/p
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); tA*hh"9
tdc.SelectObject(pOld); RB\0o,mw4
BITMAP btm; iyj,0T
bm.GetBitmap(&btm); qIO<\Yl
DWORD size=btm.bmWidthBytes*btm.bmHeight; s,tZi6Z=%E
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ] bPj%sb*@
BITMAPINFOHEADER bih; 1XwW4cZ>:
bih.biBitCount=btm.bmBitsPixel;
zK*zT$<l
bih.biClrImportant=0; B4/0t:^I
bih.biClrUsed=0; W(C\lSE0
bih.biCompression=0; C(ay7
bih.biHeight=btm.bmHeight; QNGICG-
bih.biPlanes=1; 5WT^;J9V
bih.biSize=sizeof(BITMAPINFOHEADER); `|Ll
bih.biSizeImage=size; APfDy
bih.biWidth=btm.bmWidth; ^KKU@ab9
bih.biXPelsPerMeter=0; qtqTLl@u
bih.biYPelsPerMeter=0; )_MIUQ%
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); NI@$"
static int filecount=0; >.tP7=
CString name; Ps0g
name.Format("pict%04d.bmp",filecount++); FN25,Q8:*I
name=m_Path+name; P
57{
BITMAPFILEHEADER bfh; C4#E N}
bfh.bfReserved1=bfh.bfReserved2=0; $. ;j4%%
bfh.bfType=((WORD)('M'<< 8)|'B'); ]m>N!Iu
bfh.bfSize=54+size; ZPM,ZGlu:
bfh.bfOffBits=54; #6jdv|fu
CFile bf; SP&Y|I$:
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Up(Jw-.
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); TAkM-iyH]
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Tb2Tb2C
bf.WriteHuge(lpData,size); AK#`&)0i
bf.Close(); M~6x&|2
nCount++; eH*u,/
} |k
# ~
GlobalFreePtr(lpData); ;AFF7N>&
if(nCount==1) 75O-%9lFF
m_Number.Format("%d picture captured.",nCount); R)%1GG4
else #rE#lHo
m_Number.Format("%d pictures captured.",nCount); ]>K02SVT:
UpdateData(FALSE); _l i\b-
} ;[)t*yAh
][ ,NNXrc&
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) @IB+@RmL
{ a^9-9*
if(pMsg -> message == WM_KEYDOWN) Oy @vh>RY
{ 7\BGeI
if(pMsg -> wParam == VK_ESCAPE) G)I lkA@
return TRUE; |;L%hIR[
if(pMsg -> wParam == VK_RETURN) 5y}kI
return TRUE; d/Sx+1
"{T
} K?y!zy
return CDialog::PreTranslateMessage(pMsg); m[@7!.0=
} $] js0)>
P5:X7[
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) {kLL&`ii
{ \Z +O9T%
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ {
.z6J)?J2
SaveBmp(); c'9-SY1'~
return FALSE; nFVQOr;
} l_GsQ0
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ u6~|].j R
CMenu pop; 6j]pJ]F6
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); WSdTP$?
CMenu*pMenu=pop.GetSubMenu(0); Q(
WE.ux)<
pMenu->SetDefaultItem(ID_EXITICON); lgxG:zAC
CPoint pt; DhQYjC[
GetCursorPos(&pt); LnN6{z{M
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); QfI)+pf
if(id==ID_EXITICON) ; r SpM
DeleteIcon(); DqLZc01>
else if(id==ID_EXIT) 5"f')MKUV9
OnCancel(); lP@/x+6tg
return FALSE; cuJ%;q=;
} BF*]l8p
LRESULT res= CDialog::WindowProc(message, wParam, lParam); -{
Ng6ntS
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) zSYh\g"
AddIcon(); rb+&]
return res; DA[s k7
} oGzZ.K3 A
S`LS/)
void CCaptureDlg::AddIcon() z 0;+.E!
{ KrQ8//Ih
NOTIFYICONDATA data; A7~~{9
data.cbSize=sizeof(NOTIFYICONDATA); E%CJM+r!
CString tip; rYnjQr2a
tip.LoadString(IDS_ICONTIP); c'=p4Fcm
data.hIcon=GetIcon(0); l\=M'D
data.hWnd=GetSafeHwnd(); WcyN,5
strcpy(data.szTip,tip); kfF.Ctr1a
data.uCallbackMessage=IDM_SHELL; t^h{D
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; rPV\ F
data.uID=98; Pg3O )D9
Shell_NotifyIcon(NIM_ADD,&data); v3(W4G`
ShowWindow(SW_HIDE); bg\~"
bTray=TRUE; *o8DfZ
} 6Xjr0C+
aqTMOWyeu
void CCaptureDlg::DeleteIcon() EUvxil
{ } k[gR I]
NOTIFYICONDATA data; qDqgU
data.cbSize=sizeof(NOTIFYICONDATA); ,UFr??ZKm
data.hWnd=GetSafeHwnd(); ^L&hwXAO:
data.uID=98; Y4PB&pZ$O2
Shell_NotifyIcon(NIM_DELETE,&data); iJg3`1@j
ShowWindow(SW_SHOW); :Mss"L820
SetForegroundWindow(); Q3SwW
ShowWindow(SW_SHOWNORMAL); q]%c
6{w
bTray=FALSE; Y'NQt?h
} ,B>Rc#
;>o}/h
void CCaptureDlg::OnChange() b469
{ sjLI^#a
RegisterHotkey(); Vi~9[&.E\!
} ,:!X]F#d$
kc d~`+C
BOOL CCaptureDlg::RegisterHotkey() pZRKM<k
{ $ctY#:;pV{
UpdateData(); XgUvgJ
UCHAR mask=0; <~BheGmmy
UCHAR key=0; jiPV ]aVN
if(m_bControl) z.f~wAT@<
mask|=4; 2}P<}-?6
if(m_bAlt) 'l$<DcBj
mask|=2; Ak!l}d
if(m_bShift) A&i
mask|=1; Z9rs,_A
key=Key_Table[m_Key.GetCurSel()]; hB#z8D
if(bRegistered){ Z6<vLc
DeleteHotkey(GetSafeHwnd(),cKey,cMask); {0fQ"))"
bRegistered=FALSE; n/_cJD\
} u 89u#gCAC
cMask=mask; Xp]tL3-p
cKey=key; CqVh9M.ah
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); T,h,)|:I^
return bRegistered; P7n+@L$
} |qS<{WZ!h
y%CaaK=V3
四、小结 *pN,@ZV$
RltG/ZI
本实例通过一个钩子DLL实现了屏幕抓图的功能,它有一个缺陷,那就是只能保存整个屏幕图像,不过读者朋友可以在此基础上,实现屏幕任意区域的抓图功能,具体方法不再赘述,实现起来很容易的了,呵呵。