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:
d^aLue>g;+
u|ru$cIo 一、实现方法
_ba.oIc TGG-rA6@Lx 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
GmN~e*x>p tjDCfJx* #pragma data_seg("shareddata")
2C&l\16 HHOOK hHook =NULL; //钩子句柄
Wl>$<D4mO[ UINT nHookCount =0; //挂接的程序数目
G8hDR^ra static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
yuB\Z/ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
='.G,aJ9 static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
B}ASZYpW> static int KeyCount =0;
")GrQv a static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
{F$MZ2 E #pragma data_seg()
Dj{t[z]$k MB(l*ju0 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。
nTXM/ 5sF?0P;ln 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:
*| YR8f _dw6 C2]P BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
:e TzjW= cKey,UCHAR cMask)
D5fhOq+g {
O(44Dy@2 BOOL bAdded=FALSE;
)@.6u9 \ for(int index=0;index<MAX_KEY;index++){
9y&&6r<I if(hCallWnd[index]==0){
R`emI7| hCallWnd[index]=hWnd;
%y2i1^ HotKey[index]=cKey;
!PY.FnZ HotKeyMask[index]=cMask;
<-a6'g2y bAdded=TRUE;
"0A !fRI~ KeyCount++;
S"joXmJ/-C break;
J@pCF@' }
YumHECej }
:k.C|V!W return bAdded;
K9N\E"6ZP }
R4g% $} //删除热键
6):^m{RH^ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
=L?(mNHT {
Ax;i;<md BOOL bRemoved=FALSE;
qHQ#^jH for(int index=0;index<MAX_KEY;index++){
/\1MG>#K if(hCallWnd[index]==hWnd){
vL:tuEE3 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
=M+enSu hCallWnd[index]=NULL;
MfNguh HotKey[index]=0;
!9JK95; HotKeyMask[index]=0;
LZG~1tf bRemoved=TRUE;
2OJ=Xb1 KeyCount--;
V:8ph`1 break;
|LNAd:0 }
Yhkn(k2 }
$Sfx0?' }
i=G.{. return bRemoved;
hJ1: #%Qe. }
*w;=o}` ?~>#(Q K1K3s<y+ DLL中的钩子函数如下:
<n:j@a\up0 /*8Ms` LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
MHVHEwr.{ {
SXx2 BOOL bProcessed=FALSE;
_U`_;=( if(HC_ACTION==nCode)
z rV {
$'2yPoR if((lParam&0xc0000000)==0xc0000000){// 有键松开
-K K)}I` switch(wParam)
Tv{X$`% {
$|yO
mh case VK_MENU:
~ST7@-D0 MaskBits&=~ALTBIT;
]7`)|PJ break;
c_xo6+:l case VK_CONTROL:
*[eh0$ MaskBits&=~CTRLBIT;
&_EjP
hZ break;
&91U(Go case VK_SHIFT:
Ux Yb[Nbc MaskBits&=~SHIFTBIT;
loLN
~6 break;
>dW~o_u'QN default: //judge the key and send message
J c~{ E break;
]`2=<n;= }
{u}Lhv for(int index=0;index<MAX_KEY;index++){
n^Qt !~ if(hCallWnd[index]==NULL)
fQ^45ulz continue;
zl W5$cC[ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
|lijnfp {
Lit@ m2{\ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
9cu0$P`}5 bProcessed=TRUE;
S"Dw8_y7} }
gt1W_C\ }
De>' }
nSL
x1Q else if((lParam&0xc000ffff)==1){ //有键按下
D4x~Vk%H switch(wParam)
x*A_1_A {
Ifm|_ case VK_MENU:
8tM40/U$ MaskBits|=ALTBIT;
DJv;ed%x break;
6Y|jK<n?H case VK_CONTROL:
u*ZRU
4U MaskBits|=CTRLBIT;
,h'q}5 break;
M8
E8r
case VK_SHIFT:
}?pY~f MaskBits|=SHIFTBIT;
KMxP%dV/= break;
+K3SAGm default: //judge the key and send message
/=zzym~<> break;
pm-SDp>s }
tkFGGc}w\ for(int index=0;index<MAX_KEY;index++){
wsyG~^> if(hCallWnd[index]==NULL)
6[<*C? continue;
l%?D%'afN if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
U`D.cEMfH {
\@6nRs8b|N SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
(Z
YGfX bProcessed=TRUE;
H}OOkzwrA }
5Mfs)a4j. }
cC_L4 }
D2`tWRm0 if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
vxxa,KR/y for(int index=0;index<MAX_KEY;index++){
y;+5cn C if(hCallWnd[index]==NULL)
f#RI&I\ continue;
Mt@P}4 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
?d*0-mhQ, SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
GUJaeFe //lParam的意义可看MSDN中WM_KEYDOWN部分
Y!VYD_'P }
O'~c;vBI }
JCu3,O!q }
zW`$T88~ return CallNextHookEx( hHook, nCode, wParam, lParam );
YEZd8Y }
Zc"Vf]: :wJ=t/ho 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:
$td=h)S^` 18|i{fE; BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
;* vVucx BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
zDbjWd 1sL#XB$@N 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:
L~yu G:f\wK[ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
%ec9`0^4S {
(o/HLmr@Y if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
S~QL
x {
=X(8[ e //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
=v4;t'_^ SaveBmp();
qW57h8M return FALSE;
mJ=3faM }
yv:8=.r}M …… //其它处理及默认处理
<MhjvHg }
!c`KzqP x/NR_~Rnk qRg^Bp'VD# 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。
<_HK@E<_HO gO*:<B g 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。
v$R+5_@[l FhZ^/= As 二、编程步骤
as1ZLfN. (nk)'ur. 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
D-7PO3F:F *x EcX6ZHX 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
93="sS &UhI1mi]h 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
@J~n$^ke o2
=UUD& 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;
'iM;e K
~Qzb<^9] 5、 添加代码,编译运行程序。
W+[XNIg5 Ca[H<nyj 三、程序代码
>E;-asD 4Gl0h'!( ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
EG<YxNX, #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
j rX.e #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
MP|J 0=H5 #if _MSC_VER > 1000
(9_~R^='y #pragma once
&uwj&-u? #endif // _MSC_VER > 1000
~f&lQN'1 #ifndef __AFXWIN_H__
OI3UC=G #error include 'stdafx.h' before including this file for PCH
L&wJ-}'l #endif
gA)!1V+: #include "resource.h" // main symbols
_jV(Gv' class CHookApp : public CWinApp
G.2ij%Zz {
" gB. public:
?@U7tNI CHookApp();
].f28bY // Overrides
G3{t{XkV // ClassWizard generated virtual function overrides
TqbDj|7`R //{{AFX_VIRTUAL(CHookApp)
\\80c65- public:
}cK<2J# virtual BOOL InitInstance();
.\kcWeC\ virtual int ExitInstance();
2BLcun //}}AFX_VIRTUAL
7\sJ=* //{{AFX_MSG(CHookApp)
D8a[zXWnc // NOTE - the ClassWizard will add and remove member functions here.
5BvCP // DO NOT EDIT what you see in these blocks of generated code !
P q\m8iS,w //}}AFX_MSG
Mp:/[%9Fi DECLARE_MESSAGE_MAP()
yvxdl=s };
6Q<^,`/T LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
[AzQP!gi BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
2c>e Mfa BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
8*rd`k1|g BOOL InitHotkey();
d\aarhD8* BOOL UnInit();
14TA( v]T #endif
^dB~#A1 [KA&KI^hF //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
7 jq?zS| #include "stdafx.h"
5Xn+cw* #include "hook.h"
'p=5hsG #include <windowsx.h>
"mbcZ5_ #ifdef _DEBUG
x{Y}1+Y4 #define new DEBUG_NEW
s hbPy #undef THIS_FILE
Nz`4q%+ static char THIS_FILE[] = __FILE__;
S<"M5e #endif
*I;,|Jj k #define MAX_KEY 100
6Z~u2& #define CTRLBIT 0x04
Txkmt$h #define ALTBIT 0x02
^,L vQW4 #define SHIFTBIT 0x01
H"|xG;cf #pragma data_seg("shareddata")
82%~WQnS HHOOK hHook =NULL;
#s JE{Tb UINT nHookCount =0;
P-9[,3Zd static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
3$Ew55 static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
"(y",!U@ static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
-TKS`,# static int KeyCount =0;
70p1&Y7or static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
8X=cGYC# #pragma data_seg()
TRwlUC3hQ HINSTANCE hins;
B .p&,K void VerifyWindow();
l6Hu(.Ls;j BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
(~F{c0\C //{{AFX_MSG_MAP(CHookApp)
O5HK2Xg,C // NOTE - the ClassWizard will add and remove mapping macros here.
V5y8VT=I
// DO NOT EDIT what you see in these blocks of generated code!
hC ^| //}}AFX_MSG_MAP
1iq,Gd-G. END_MESSAGE_MAP()
<7HVkAa J&4QI( b. CHookApp::CHookApp()
S pxkB! {
c$),/0td| // TODO: add construction code here,
{6%vmMbJ // Place all significant initialization in InitInstance
Fj\}&H*+ }
%,$Ms?,n` t3ua5xw CHookApp theApp;
uP<w rlW LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
5urM,1SQ@ {
wjk-$p BOOL bProcessed=FALSE;
sS 5 ]d8
if(HC_ACTION==nCode)
Rk2V[R.`S {
|FZ)5 if((lParam&0xc0000000)==0xc0000000){// Key up
74YMFI switch(wParam)
Q3MG+@) S {
D"o}X TH case VK_MENU:
y=i_:d0M MaskBits&=~ALTBIT;
?!>B}e&, break;
|4uH case VK_CONTROL:
\\F^uM7, MaskBits&=~CTRLBIT;
<.j `n break;
OE87&Cl"{t case VK_SHIFT:
'>[l1<d!G MaskBits&=~SHIFTBIT;
CW*Kdt break;
WF0%zxg ] default: //judge the key and send message
CZB!vh0 break;
Qs2E>C }
yidUtSv=, for(int index=0;index<MAX_KEY;index++){
FQdz":5 if(hCallWnd[index]==NULL)
7%?2>t3~ continue;
7'wt/9 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
~=h M y`Ml {
CJ B
SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
V4cCu~(3;~ bProcessed=TRUE;
S,Q!Xb@ }
K#bd b }
T^LpoN/T }
}gL:"C"~ else if((lParam&0xc000ffff)==1){ //Key down
QC7Ceeh]4 switch(wParam)
bJc<FL<E {
Ed[ tmaEuV case VK_MENU:
Q!DH8'|4?L MaskBits|=ALTBIT;
L/Cp\|~ O break;
g_lj/u]P case VK_CONTROL:
"?Dov/+Q. MaskBits|=CTRLBIT;
4|Z;EAFx break;
@UCI^a~w case VK_SHIFT:
YXE?b@W" MaskBits|=SHIFTBIT;
X`km\\* break;
lz>YjK: default: //judge the key and send message
^VsX9 break;
~!( (?8" }
q$)$?" for(int index=0;index<MAX_KEY;index++)
+We_[Re`< {
0TA{E-A if(hCallWnd[index]==NULL)
DBDHe-1[+ continue;
&YQ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
40TS=evG {
KL:x!GsV5e SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
\7W>3 bProcessed=TRUE;
<a/TDW }
yOKpi&! r }
shjc`Tqm }
5\RTy}w3x if(!bProcessed){
L:$kd `v[ for(int index=0;index<MAX_KEY;index++){
KT1/PWa if(hCallWnd[index]==NULL)
oej5bAi continue;
\lj.vzD-A if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
r*#ApM"L SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
.!uXhF' }
*_G(*yAe( }
S~BBBD }
$OI 6^ return CallNextHookEx( hHook, nCode, wParam, lParam );
hdky:2^3 }
nulCk33x'= t)|*-= BOOL InitHotkey()
wQR>S>p {
l ;"v&? if(hHook!=NULL){
@<]sW*s nHookCount++;
3IXai)6U return TRUE;
k
I{)" }
l,cnMr^.W else
ks92-%;: hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
~{Gbu oH if(hHook!=NULL)
r!H'8O! nHookCount++;
u{#}Lo>B # return (hHook!=NULL);
e>yPFXSk }
Y~ j.Kt BOOL UnInit()
(Fc\*Vn {
2$=U#!OtU if(nHookCount>1){
\Fd6Q_ nHookCount--;
NfG<! return TRUE;
B/"TaXVU }
YbaaX{7^ BOOL unhooked = UnhookWindowsHookEx(hHook);
>*jcXao^ if(unhooked==TRUE){
eVL#3|= nHookCount=0;
AY]dwKw hHook=NULL;
-$W#bqvz^ }
Co|3k:I 8 return unhooked;
0=N,y }
>eX&HS oy GM&< ?K1 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
HgH\2QL3& {
4n55{?Z BOOL bAdded=FALSE;
j\W"P_ dpd for(int index=0;index<MAX_KEY;index++){
e/+_tC$@p@ if(hCallWnd[index]==0){
3khsGD@ hCallWnd[index]=hWnd;
Y0nnn HotKey[index]=cKey;
pq8XCOllXx HotKeyMask[index]=cMask;
;U7o)A; bAdded=TRUE;
9a\H+Y~ KeyCount++;
Ziclw) break;
;bz|)[4/ }
"Zk# bQ2j }
:H9\nU1
return bAdded;
s3nt12 }
MA}~bfB m|K"I3W$ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
-Ky<P<@ezm {
G]Rb{v,r BOOL bRemoved=FALSE;
'i-6JG% for(int index=0;index<MAX_KEY;index++){
)OjTn" if(hCallWnd[index]==hWnd){
i.QS(gM if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
N=Q<mj;, hCallWnd[index]=NULL;
n7Em
t$Hi> HotKey[index]=0;
GnAG'.t-Z HotKeyMask[index]=0;
rGa@!^hk bRemoved=TRUE;
Ck`-<)uN KeyCount--;
E}^np[u7 break;
N, `q1B }
\X3Q,\H
@ }
TcW-pY<N }
91I6-7# Xt return bRemoved;
Vq8 G( <77 }
U.XvS''E G
=`-w void VerifyWindow()
k2bjBAT {
O|Sbe%[*wW for(int i=0;i<MAX_KEY;i++){
KGM9
b if(hCallWnd
!=NULL){ \<e?
if(!IsWindow(hCallWnd)){ '3%J hG)#
hCallWnd=NULL; TJYup%q
HotKey=0; rcq^mPdQ
HotKeyMask=0; G909R>
KeyCount--; e>F i
} g`7C1&U*T
} ,W8EU
} ?L K
n
} B#Q` !B4v
ar&j1""
BOOL CHookApp::InitInstance() }-Ds%L
{ `efC4#*!!
AFX_MANAGE_STATE(AfxGetStaticModuleState()); "Wz8f
hins=AfxGetInstanceHandle(); fAEgrw%Ti
InitHotkey(); 7Shau%2C
return CWinApp::InitInstance(); Dx)>`yJk$;
} {^J/S}L]
V /.Na(C~
int CHookApp::ExitInstance() 1iA0+Ex(j
{ Fb2,2Px
VerifyWindow(); 3!l+)g
UnInit(); }na0
return CWinApp::ExitInstance(); D_SXxP[! g
} ^"dVz.
I45 kPfu
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ~^{>!wU+
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) }l>\D~:M
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ lpq)vKM}^
#if _MSC_VER > 1000 `Wl_yC_*G;
#pragma once /EIQMZuYp
#endif // _MSC_VER > 1000 Ob ~7w[n3
]QU
9|1
class CCaptureDlg : public CDialog `p!&>,lrk
{ MV{\:l}y
// Construction [Xa,|
public: %fT%,(
w}t
BOOL bTray; -R]Iu\
BOOL bRegistered; T\ *#9a
BOOL RegisterHotkey();
A
".v+
UCHAR cKey; @d&JtA
UCHAR cMask; TS_5R>R3
void DeleteIcon(); <<=.;`(/v
void AddIcon(); aM7e?.rU
UINT nCount; cyMvjzzRN
void SaveBmp(); u1}/SlCp
CCaptureDlg(CWnd* pParent = NULL); // standard constructor K N Y
// Dialog Data )_&P:;N
//{{AFX_DATA(CCaptureDlg) ndmsXls
enum { IDD = IDD_CAPTURE_DIALOG }; o5@d1A
CComboBox m_Key; Z bW!c1s{
BOOL m_bControl; bcR";cE
BOOL m_bAlt; adcH3rV
BOOL m_bShift; A`B>fI
CString m_Path; UF&B7r
CString m_Number; 0&~JC>S
//}}AFX_DATA @3w6!Sgh
// ClassWizard generated virtual function overrides *b}/fG)XZ
//{{AFX_VIRTUAL(CCaptureDlg) H|Y*TI2vf8
public: U#iGR5&^3
virtual BOOL PreTranslateMessage(MSG* pMsg); &ir|2"HV
protected: xA'RO-a}h
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support :'
=le*h
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ptc.JB6
//}}AFX_VIRTUAL } =p e;l
// Implementation n#l~B@
protected: Bq5-L}z
HICON m_hIcon; 9bQD"%ha=d
// Generated message map functions <e?1&5 6
//{{AFX_MSG(CCaptureDlg) 4<j7F4
virtual BOOL OnInitDialog(); *V`E)maU
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); en_W4\7^
afx_msg void OnPaint(); &At9@
afx_msg HCURSOR OnQueryDragIcon(); q)l1tC72
virtual void OnCancel(); d[\$a4G+
afx_msg void OnAbout(); <Fi*wV
afx_msg void OnBrowse(); tCR#TW+IY-
afx_msg void OnChange(); MpVZL29)
//}}AFX_MSG b$eN]L
DECLARE_MESSAGE_MAP() 43}uW,P
}; ~} 02q5H
#endif Al3*? H&
SIZ&0V
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file HdR TdV
#include "stdafx.h" >1qum'
#include "Capture.h" 8DuD1hZq
#include "CaptureDlg.h" HEk{!Y
#include <windowsx.h> M?d (-en
#pragma comment(lib,"hook.lib") }Ip1|Gj
#ifdef _DEBUG rQ-,mq
#define new DEBUG_NEW o?g9Grk
#undef THIS_FILE .T1n"TfsGO
static char THIS_FILE[] = __FILE__; kz"QS.${
#endif h+!@`c>)Y
#define IDM_SHELL WM_USER+1 2M>`W5
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ]PlLy:(
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); NI:3hfs
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; YO9ofT
class CAboutDlg : public CDialog C"0vMUZ
{ 9'=ZxV
public: K]'t>:G@
CAboutDlg(); [#SiwhF|
// Dialog Data c :2 w(BVi
//{{AFX_DATA(CAboutDlg) ":_~(?1+
enum { IDD = IDD_ABOUTBOX }; !{?<(6;t
//}}AFX_DATA +,_%9v?3
// ClassWizard generated virtual function overrides
K,o&gY
//{{AFX_VIRTUAL(CAboutDlg) KTE X]
protected: V6bjVd9|Z
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support #=T^XHjQ
//}}AFX_VIRTUAL #0f6X,3
// Implementation c
'rn8Jo}
protected: z[qi~&7:v
//{{AFX_MSG(CAboutDlg) O|nLIfT
//}}AFX_MSG eUKl(
DECLARE_MESSAGE_MAP() 3>6rO4,
}; FOAXm4"
[7\x(W-:@>
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Mt*V-`+\
{ b(Yxsy{U
//{{AFX_DATA_INIT(CAboutDlg) S"/-)_{
//}}AFX_DATA_INIT Os/?iGlD*E
} hs*n?vxp3
Db*&'32W
void CAboutDlg::DoDataExchange(CDataExchange* pDX) I uC7Hx`z
{ qi['~((
CDialog::DoDataExchange(pDX); &a+=@Z)kf
//{{AFX_DATA_MAP(CAboutDlg) B"rO
//}}AFX_DATA_MAP C^fn[plL
} d[YG&.}+8j
RB9ZaL\
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) $>zqCi2tB<
//{{AFX_MSG_MAP(CAboutDlg) AqT}^fS
// No message handlers Khh}flRy
//}}AFX_MSG_MAP KJv[z
END_MESSAGE_MAP() :W9a t
Ri>ZupQ6
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Dqc2;>
: CDialog(CCaptureDlg::IDD, pParent) XM)
{ 5FE&
//{{AFX_DATA_INIT(CCaptureDlg) f#\Nz>tOhE
m_bControl = FALSE; A*{CT>
m_bAlt = FALSE; h!7Lvh`o
m_bShift = FALSE; hGcu(kAC,
m_Path = _T("c:\\"); 9TZ 6c
m_Number = _T("0 picture captured."); eVzZfB-=4}
nCount=0; r&_e3#]*
bRegistered=FALSE; E"7[|-`e6
bTray=FALSE; hlfdmh?/
//}}AFX_DATA_INIT Ab8Ke|fA
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 <cFj-Ys(T
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); M6j~`KSE
} z<_a4ffR
8v)iOPmDC
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 7#7AK}
{ &@ ${@
CDialog::DoDataExchange(pDX); 9TbbIP1
//{{AFX_DATA_MAP(CCaptureDlg) T@Z-;^aV
DDX_Control(pDX, IDC_KEY, m_Key); V}ls|B$Y
DDX_Check(pDX, IDC_CONTROL, m_bControl); t)mc~M9w
DDX_Check(pDX, IDC_ALT, m_bAlt); \x|8
DDX_Check(pDX, IDC_SHIFT, m_bShift); Cg8
DDX_Text(pDX, IDC_PATH, m_Path); }^
=f%EjV
DDX_Text(pDX, IDC_NUMBER, m_Number); DUwms"I,%
//}}AFX_DATA_MAP xX@9wNYD
} 2|&SG3e+(I
ZcN#jnb0/
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 2$'bOo
//{{AFX_MSG_MAP(CCaptureDlg) {$V2L4
ON_WM_SYSCOMMAND() R+El/ya:6
ON_WM_PAINT() VI-6t"l
ON_WM_QUERYDRAGICON() dl(!{tZ#
ON_BN_CLICKED(ID_ABOUT, OnAbout) 6#Rco%07zI
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) RIDl4c
[
ON_BN_CLICKED(ID_CHANGE, OnChange) Z FX6iAxd
//}}AFX_MSG_MAP F##xVmR~
END_MESSAGE_MAP() gfKv$~
NieNfurG%
BOOL CCaptureDlg::OnInitDialog() 0es\
j6c
{ TuC
CDialog::OnInitDialog(); B=%x#em
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); i0Rj;E=:]
ASSERT(IDM_ABOUTBOX < 0xF000); $&&+2?cx0
CMenu* pSysMenu = GetSystemMenu(FALSE); 1B@7#ozWA?
if (pSysMenu != NULL) `fE'$2
{ '.jYu7
CString strAboutMenu; D^}2ilk!
strAboutMenu.LoadString(IDS_ABOUTBOX); <`?%Cz AO
if (!strAboutMenu.IsEmpty()) z0%tBgqY(
{ hVl@7B~
pSysMenu->AppendMenu(MF_SEPARATOR); vpC?JXz=H
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); h^,av^lg^
} SXC
7LJm<g
} &Mz]y?k'
SetIcon(m_hIcon, TRUE); // Set big icon Ro;I%j
SetIcon(m_hIcon, FALSE); // Set small icon mW~*GD~r
m_Key.SetCurSel(0); s~ou$!|
RegisterHotkey(); 6
$`l
CMenu* pMenu=GetSystemMenu(FALSE); .@ZrmO
o]]
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 5vLA)Al3
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Y[W :Zhl;
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 50`|#zF^#
return TRUE; // return TRUE unless you set the focus to a control RRQIlI<
} nTD4^'
57q?:M=^
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 8c>xgFWp9
{ C;%dZ
if ((nID & 0xFFF0) == IDM_ABOUTBOX) "y5bODq3t
{ x[u6_6=q9
CAboutDlg dlgAbout; qj4jM7
dlgAbout.DoModal(); w"W;PdH)
} x&r f]R
else ?6HnN0A)
{ IVVX3RI
CDialog::OnSysCommand(nID, lParam); >nvnU`\
} +"1-W>HV
} (g&@E(@]?
T^{=cx9x9
void CCaptureDlg::OnPaint() dK;ebg9|
{ LIKQQ
if (IsIconic()) [KCR@__
{ ^+0>,-)F
CPaintDC dc(this); // device context for painting ]re}EB\Rs
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); VGc.yM)&
j
// Center icon in client rectangle bcT'!:
int cxIcon = GetSystemMetrics(SM_CXICON); X<5&R{oZ
int cyIcon = GetSystemMetrics(SM_CYICON); jeB"j
CRect rect; qJ .XI
GetClientRect(&rect); nB0KDt_
int x = (rect.Width() - cxIcon + 1) / 2; t,Q"Pt?
int y = (rect.Height() - cyIcon + 1) / 2; qe22 kE#
// Draw the icon bR;.KC3C
dc.DrawIcon(x, y, m_hIcon); G_zK .N
} ZAn9A>5_
else t/3HX]B_
{ $sUn'62JlU
CDialog::OnPaint(); F)Z9Qlo
} u \<APn
} ;/kmV~KG
H}q$6WE
HCURSOR CCaptureDlg::OnQueryDragIcon() )3<>H!yG}
{ !Rgj'{
return (HCURSOR) m_hIcon; mD|Q+~=|e
} dK0H.|
_'<FBlIN
void CCaptureDlg::OnCancel() t<j_` %`8
{ L}'^FqO[IW
if(bTray) P]OUzI,
DeleteIcon(); LFr$h`_D5
CDialog::OnCancel(); &|#,Bsk"@
} M?o_J4
`~=NBN=tiL
void CCaptureDlg::OnAbout() zbGZ\pz
{ /8<c~
CAboutDlg dlg; k8l7.e*
dlg.DoModal(); YK5(o KFN
} [=tIgMmz
{[hgSVN;
void CCaptureDlg::OnBrowse() )o-mM
tPj
{ 1Dhu5ht
CString str; (_6JQn
BROWSEINFO bi; #k[Y(_
char name[MAX_PATH]; yk(r R
ZeroMemory(&bi,sizeof(BROWSEINFO)); a5/Dz&>j6
bi.hwndOwner=GetSafeHwnd(); =-&h@mB;G
bi.pszDisplayName=name; .g?D3$|K
bi.lpszTitle="Select folder"; >3~)2)Q
bi.ulFlags=BIF_RETURNONLYFSDIRS; u:6R|%1fNn
LPITEMIDLIST idl=SHBrowseForFolder(&bi); bUds E1f
if(idl==NULL) ] W$V#
return; * dk(<g=fM
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); JIHIKH-#
str.ReleaseBuffer(); Bk^o$3#
m_Path=str; F S$8F
if(str.GetAt(str.GetLength()-1)!='\\') mlUj%:Gm#
m_Path+="\\"; G
\Nnw==v
UpdateData(FALSE); d @ l
} p L^3*B.Nr
4%|r$E/TQ
void CCaptureDlg::SaveBmp() n)z:C{
{ 2?v }w<Ydl
CDC dc; FjLMN{eH/
dc.CreateDC("DISPLAY",NULL,NULL,NULL); Xr'b{&
CBitmap bm; jSRi
int Width=GetSystemMetrics(SM_CXSCREEN); UX<)hvKj
int Height=GetSystemMetrics(SM_CYSCREEN); HgBu:x?&
bm.CreateCompatibleBitmap(&dc,Width,Height); SqdI($F\:
CDC tdc; -M_>]ubG
tdc.CreateCompatibleDC(&dc); xI/8[JW*
CBitmap*pOld=tdc.SelectObject(&bm); z.?slYe[
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 'KT(;Vof
tdc.SelectObject(pOld); _OS,zZ0
BITMAP btm; [7g-M/jvY
bm.GetBitmap(&btm); FC||6vJth
DWORD size=btm.bmWidthBytes*btm.bmHeight; N9y+Psh
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); W-Vc6cq
BITMAPINFOHEADER bih; K5t.OAA:
bih.biBitCount=btm.bmBitsPixel; Fs(S!;
bih.biClrImportant=0; '#eT
bih.biClrUsed=0; {E7STLQ_%
bih.biCompression=0; H
SGz-
bih.biHeight=btm.bmHeight; ,A)Z.OWOq
bih.biPlanes=1; ET 0(/Zz
bih.biSize=sizeof(BITMAPINFOHEADER); -YmIRocx
bih.biSizeImage=size; 2JcP4!RD
bih.biWidth=btm.bmWidth; 3 `mtc@*
bih.biXPelsPerMeter=0;
U0srwt97S
bih.biYPelsPerMeter=0; &\Lu}t7Ru
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ZLPj1L
static int filecount=0; c@)?V>oe
CString name; %+<1X?;,Fq
name.Format("pict%04d.bmp",filecount++); #};Zgixo$
name=m_Path+name; };EB[n
BITMAPFILEHEADER bfh; jW-;Y/S
bfh.bfReserved1=bfh.bfReserved2=0; 412E7
bfh.bfType=((WORD)('M'<< 8)|'B'); DyA/!%g
bfh.bfSize=54+size; ]mUt[Yy:z
bfh.bfOffBits=54; fny6`_O
CFile bf; M)AvcZNs
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ zK{}
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ?r5a*
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); r.6?|
bf.WriteHuge(lpData,size); ,?Zy4-
bf.Close(); 53pT{2]zAi
nCount++; i\gt
@
} 79-50}A
GlobalFreePtr(lpData); x;-D}#
if(nCount==1) Uj3HAu
m_Number.Format("%d picture captured.",nCount); !c-MC|
else j]]5&u/l
m_Number.Format("%d pictures captured.",nCount); qDhZC*"9#D
UpdateData(FALSE); pG"hZB3)
} AZA5>Y
@$
lX%p>
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) g jzWW0C
{ :XPat93w
if(pMsg -> message == WM_KEYDOWN) \pTv;(
{ {XUSw8W'
if(pMsg -> wParam == VK_ESCAPE) kBk2mMZ
return TRUE; oDJ
&{N|
if(pMsg -> wParam == VK_RETURN) YnW9uy5
return TRUE; mFxt +\
} H~SU:B:
return CDialog::PreTranslateMessage(pMsg); ?4Fev_5m
} 5p5"3m;M7
apgKC;
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) -1`}|t;
{ QnS#"hc\a
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ *M0O&" ~j
SaveBmp(); `P-d. M6Oa
return FALSE; q;IuV&B
} Q2* 8c$
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ pSIXv%1J
CMenu pop; SW+;%+`
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); %g3QE:(2@q
CMenu*pMenu=pop.GetSubMenu(0); ]KXyi;n2
pMenu->SetDefaultItem(ID_EXITICON); ~Fl\c-
CPoint pt; D/%v/mpj$
GetCursorPos(&pt); >i.$s
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); jO|`aUYTf
if(id==ID_EXITICON) yf`_?gJ6d
DeleteIcon(); Qu7ML]e?z
else if(id==ID_EXIT) 5 wN)N~JE
OnCancel(); PYY<
return FALSE; !r/~D |
} G\,B*$3
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Br&&#
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 9F6dKPN:
AddIcon(); zb02\xvf
return res; &jQqlQ j
} a|[f%T<<
3u^wK
void CCaptureDlg::AddIcon() #N64ZXz_
{ :,R>e}lM
NOTIFYICONDATA data; fQg^^ZXe"
data.cbSize=sizeof(NOTIFYICONDATA); zxx9)I@?A
CString tip; A&%7Z^Pp
tip.LoadString(IDS_ICONTIP); @,6*yyO
data.hIcon=GetIcon(0); "{H{-`Ni
data.hWnd=GetSafeHwnd(); 4gdXO
strcpy(data.szTip,tip); ~|ZAS]
data.uCallbackMessage=IDM_SHELL; ,HmGp
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ^^tTA^
data.uID=98; .pm%qEh
Shell_NotifyIcon(NIM_ADD,&data); OT6Te&
ShowWindow(SW_HIDE); W_Y56@7e
bTray=TRUE; $vYy19z
} a>,_o(]cW
>uQjygjj
void CCaptureDlg::DeleteIcon() *ezft&{)`
{ {)!ua7GF0H
NOTIFYICONDATA data; 5nceOG8
data.cbSize=sizeof(NOTIFYICONDATA); U~@;2\
o
data.hWnd=GetSafeHwnd(); >c5
data.uID=98; ^gpd '*b
Shell_NotifyIcon(NIM_DELETE,&data); xS+xUi
ShowWindow(SW_SHOW); Fl{~#]
SetForegroundWindow(); xy$aFPH!-
ShowWindow(SW_SHOWNORMAL); T?.l_"%%d
bTray=FALSE; D+ jvF
} :P+7ti@
0JR)-*
void CCaptureDlg::OnChange() )"M;7W?R0
{ XtBEVqrhi
RegisterHotkey(); R"CF xo
} `zl,|}u)
BePb8
k<y
BOOL CCaptureDlg::RegisterHotkey() ?@`5^7*
{ $*P+
UpdateData(); XbFo#Pwk
UCHAR mask=0; lU&2K$`
UCHAR key=0; 9(vp`Z8B4
if(m_bControl) EQZ/v gho
mask|=4; .RmoO\
,Gm
if(m_bAlt) p<l+js(5|
mask|=2; 3!QXzT$E
if(m_bShift) Xa$%`
mask|=1; *H=h7ESq
key=Key_Table[m_Key.GetCurSel()]; T%Zfo7
if(bRegistered){ 6Rq +=X
DeleteHotkey(GetSafeHwnd(),cKey,cMask); yOb']
bRegistered=FALSE; mRGr+m
} nKtRJ,>
cMask=mask; :fy,%su
cKey=key; =T?Xph{
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); i??+5o@uTF
return bRegistered; HxLuJ
} c*"P+
IEJ)Q$GI#
四、小结 Ag2Q!cq
H/8u?OC
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。