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:
L$<(HQQJ8
|4A938'4j 一、实现方法
+q@g C4/p5J 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
34Z$a{
w 5W~-|8m #pragma data_seg("shareddata")
aO>Nev HHOOK hHook =NULL; //钩子句柄
>KMTxHE`+ UINT nHookCount =0; //挂接的程序数目
K18Sj,]B static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
jbK<"T5 static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
/\|AHM static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
e x`mu E static int KeyCount =0;
>ISN2Kn
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
>;zQ.2* #pragma data_seg()
hp)k[|u; 3# r`e 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。
R=u!RcvR <zE~N~; 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:
C'Z6l^{> X6lUFko BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
Z=\wI:TY1 cKey,UCHAR cMask)
@8qo(7<~Q {
CPS1b BOOL bAdded=FALSE;
t+`>zux5(T for(int index=0;index<MAX_KEY;index++){
@2Ca]2,4 if(hCallWnd[index]==0){
1>e%(k2w% hCallWnd[index]=hWnd;
UO{3vry48 HotKey[index]=cKey;
64h$sC0z/e HotKeyMask[index]=cMask;
}iCcXZ&5^ bAdded=TRUE;
A *_ |/o KeyCount++;
)+xHv break;
lH8e?zJ }
8{iFxTz }
{ WW!P,w return bAdded;
3D/<R|p }
FR9*WI
//删除热键
U6Ws#e BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
#_}r)q
{
L:3 BOOL bRemoved=FALSE;
E3<~C(APW for(int index=0;index<MAX_KEY;index++){
a}#Jcy!e if(hCallWnd[index]==hWnd){
!>Ru= $9 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
$2+(|VG4F hCallWnd[index]=NULL;
skRI\ HotKey[index]=0;
#:6gFfk0< HotKeyMask[index]=0;
Kx@;LRY# bRemoved=TRUE;
1l*O;J9By KeyCount--;
jVhfpS[ break;
=ijVT_|u0 }
)RE~=*?d }
`lA[-x~ }
/ %:%la% return bRemoved;
5EqC.g. }
.8K ~ h ~\~K,v mrvPzoF,] DLL中的钩子函数如下:
V)g{ Ew]: 9?~K"+-SI LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
s$ v<p(yl {
"P_PqM BOOL bProcessed=FALSE;
G)'(%rl if(HC_ACTION==nCode)
;$= GrR {
|w7D&p$ if((lParam&0xc0000000)==0xc0000000){// 有键松开
N)H
_4L switch(wParam)
ek3,ss3 {
^w*$qzESy case VK_MENU:
Zc Y* TGx MaskBits&=~ALTBIT;
21\t2<" break;
!O-9W=NJ case VK_CONTROL:
Skn2-8;10 MaskBits&=~CTRLBIT;
7,![oY[ break;
ahJu+y case VK_SHIFT:
!W ,pjW%Y MaskBits&=~SHIFTBIT;
|zaYIVE[ break;
e//q`?ys default: //judge the key and send message
E:C-k^/[Y break;
lq%6~va }
gvx
{;e for(int index=0;index<MAX_KEY;index++){
GE0,d if(hCallWnd[index]==NULL)
etHkyF continue;
A_vf3 *q if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
NtnKS@Ht {
yA#-}Y|]b SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
>
l@o\ bProcessed=TRUE;
wK[Xm'QTPJ }
xf?6_= }
t:h~p-&QB }
B1C"F-2d else if((lParam&0xc000ffff)==1){ //有键按下
$sX X6K), switch(wParam)
82bOiN15 {
`mfN3Q*[c case VK_MENU:
%G%D[ i] MaskBits|=ALTBIT;
$_P*Bk) break;
pd1V8PZSG case VK_CONTROL:
#g6*s+Gm MaskBits|=CTRLBIT;
VP<_~OLc break;
}N6r/
VtOQ case VK_SHIFT:
d^Jf(NE0Yo MaskBits|=SHIFTBIT;
Xw2tCRzD break;
,n&e,I default: //judge the key and send message
`?PpzDV7Y break;
%bs~%6) }
gqi|k6V/ for(int index=0;index<MAX_KEY;index++){
MSMgaw? if(hCallWnd[index]==NULL)
QNzx(IV@ continue;
-#ta/*TT: if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
8eVQnp* {
HAi'0%" SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
C"We>! bProcessed=TRUE;
Ehv*E }
'n)]"G| }
%O< qw }
[H!8m7i; if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
zU7/P|Dw+ for(int index=0;index<MAX_KEY;index++){
b2Jgg&?G if(hCallWnd[index]==NULL)
z^q ~|7 continue;
]5=C3Y if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
#el i_Cxe SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
-brn&1oJ //lParam的意义可看MSDN中WM_KEYDOWN部分
F9SkEf]99 }
mJ3|UClPS }
<CJ`A5N }
sBo|e]m# return CallNextHookEx( hHook, nCode, wParam, lParam );
w53+k\. }
'*PJ-=G *&\fBi] 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:
#)r
{J}Zv5 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
}gr6naz BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
q-;z!iq|! C6 XZZ 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:
-0{"QhdE% j(;o LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
_qPd)V6yb {
^j1WF[GiSO if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
lR9~LNK? {
abVz/R/o //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
Y`x54_32 SaveBmp();
f[bx|6 return FALSE;
e"sz jY~V }
f_&bwfbo …… //其它处理及默认处理
~S],)E1w }
k365.nc \*C}[D $
+` 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。
Xiyh3/%yy jE!W&0 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。
whzV7RT Z|z+[V}[ 二、编程步骤
`qjiC>9 pV3o\bk! 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";
V ?10O fFHT`"bD: 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
~;f,Ad`Q 2f8Cs$Opb 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
"Zh6j)[o c&Mci"nj0 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
Iaq7<$XU k lRS:\dW 5、 添加代码,编译运行程序。
+{$NN d `z),A= 三、程序代码
O=HT3gp& BtSl%(w ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
c&+p{hH+ #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
X\I"%6$ #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
drJ<&1O #if _MSC_VER > 1000
Uv(THxVh #pragma once
SLa\F #endif // _MSC_VER > 1000
2xchjU- #ifndef __AFXWIN_H__
%D(%
lh2 #error include 'stdafx.h' before including this file for PCH
LV:`siK #endif
xJvM
l`2; #include "resource.h" // main symbols
QT5,_+ho class CHookApp : public CWinApp
K#B)@W?9 {
M-Az2x;6 public:
<fJ*{$[p CHookApp();
$_6DvJ0 // Overrides
=)B@ `" // ClassWizard generated virtual function overrides
3MR4yw5v //{{AFX_VIRTUAL(CHookApp)
LM*#DLadk public:
_VeZlk7k virtual BOOL InitInstance();
Kw%n;GFl' virtual int ExitInstance();
>taC_f06 //}}AFX_VIRTUAL
Ax=k0%M[& //{{AFX_MSG(CHookApp)
`dH[&=S // NOTE - the ClassWizard will add and remove member functions here.
;_yp@.,\T // DO NOT EDIT what you see in these blocks of generated code !
l3sL!D1u //}}AFX_MSG
!$:lv)y DECLARE_MESSAGE_MAP()
'$]u?m };
PQmgv&!DP LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
IT3xX=|b BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
0 ttM_]#q BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
+%$'(ts BOOL InitHotkey();
vGK'U*gGD BOOL UnInit();
>-s\$8En' #endif
*Ge2P3 D(MolsKc? //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
[jD.l;jF #include "stdafx.h"
pZu2[ #include "hook.h"
A~CQ@ #include <windowsx.h>
IAD_Tck #ifdef _DEBUG
3H0~?z_ #define new DEBUG_NEW
UIUCj8QJg #undef THIS_FILE
rUX1Iu7 static char THIS_FILE[] = __FILE__;
,cR=W|6cQm #endif
4uW}.7R' #define MAX_KEY 100
H0Q.; !^ #define CTRLBIT 0x04
R"S,& #define ALTBIT 0x02
Z|YiYQl[) #define SHIFTBIT 0x01
A9_)} #pragma data_seg("shareddata")
3Z* ' HHOOK hHook =NULL;
;:JTb2xbb UINT nHookCount =0;
v2>.+Eh# static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
5I!EsW$sY static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
SBBDlr^P static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
87P.K Yy static int KeyCount =0;
e}u#:ysj static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
OPp>z0p%6X #pragma data_seg()
*&b~cyC HINSTANCE hins;
69U[kW& void VerifyWindow();
o2cZ BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
k%iZ.. //{{AFX_MSG_MAP(CHookApp)
C:77~f-+rQ // NOTE - the ClassWizard will add and remove mapping macros here.
9/rX% // DO NOT EDIT what you see in these blocks of generated code!
w<?v78sT //}}AFX_MSG_MAP
(UDR=7w) END_MESSAGE_MAP()
qB`zyd8yu #`tn:cP CHookApp::CHookApp()
6Q&R,"!$p {
U*G9 fpVy // TODO: add construction code here,
bgW=.s // Place all significant initialization in InitInstance
E>j*m}b }
fr~e!!$H nRpZ;X)'. CHookApp theApp;
D2$"!7O1H LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
#GBe=tm\K {
8~QEJW$ BOOL bProcessed=FALSE;
#P,mZ}G\ if(HC_ACTION==nCode)
*R17 KMS {
2QUZAV\ Y if((lParam&0xc0000000)==0xc0000000){// Key up
eGrC0[SH switch(wParam)
>gAq/'.Q {
KmoPFlw case VK_MENU:
Xg|_ MaskBits&=~ALTBIT;
s2t'jIB break;
gf`uC0 case VK_CONTROL:
p&wXRI MaskBits&=~CTRLBIT;
S0V%JY;Gv break;
VXforI case VK_SHIFT:
7xAzd#
c?= MaskBits&=~SHIFTBIT;
zi~_[l- break;
)NeI]p default: //judge the key and send message
;eznONNF break;
Dp
0
}
_w+ix9Fr? for(int index=0;index<MAX_KEY;index++){
2| u 'J if(hCallWnd[index]==NULL)
9/OB!<*V| continue;
krkRP%jy if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
m2[q*k]AtS {
v~>^c1: SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
=F2e*?a3 bProcessed=TRUE;
FL5u68 }
-DwqoWZ }
e[fzy0 }
sidSY8j else if((lParam&0xc000ffff)==1){ //Key down
ar.w'z switch(wParam)
7dl]f#uZU {
JV|GEn\@N case VK_MENU:
C<CE!|sfr MaskBits|=ALTBIT;
k$nQY break;
RsJj*REO case VK_CONTROL:
y0vo-)E]-] MaskBits|=CTRLBIT;
g2b%.X4 break;
0 r=:l/Pz case VK_SHIFT:
Y|FJ1x$r MaskBits|=SHIFTBIT;
l^x5m]Kt break;
DXj_\ R(} default: //judge the key and send message
/[YH
W] break;
M9{?gM9 }
b?-Ep?G'\ for(int index=0;index<MAX_KEY;index++)
EB'(%dH {
tp2CMJc{L if(hCallWnd[index]==NULL)
;\=W=wL( continue;
hv
18V>8 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
yyJ4r}TE {
_K{hq<g SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
N%{&%C 6{ bProcessed=TRUE;
;+XiDEX0} }
"J(#|v0 }
iivuH2/~?[ }
pX
]K- if(!bProcessed){
}PGl8F ! for(int index=0;index<MAX_KEY;index++){
D\8 ~3S'd if(hCallWnd[index]==NULL)
:(EU\yCzK continue;
x0wy3+GZc if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
dxlaoyv: SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
cF_hU" }
mT\!LpX }
V2kNJwwk }
E<;C@B return CallNextHookEx( hHook, nCode, wParam, lParam );
gc@,lNmi }
jj8AV lN C.dN)?O BOOL InitHotkey()
P`wp`HI {
w^09|k if(hHook!=NULL){
WZaOw w nHookCount++;
uUb[Dqn return TRUE;
v|~ yIywf }
SEQ
bw](ss else
{q%&~ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
QSf{V(fs if(hHook!=NULL)
az3rK4g nHookCount++;
\MM(w& return (hHook!=NULL);
9|O#+_=+v }
N ?0T3-/K BOOL UnInit()
5!,`LM9 {
H"f%\' if(nHookCount>1){
0hK)/!Y nHookCount--;
5%C-eB return TRUE;
>(EMZ5 }
uN V(r" BOOL unhooked = UnhookWindowsHookEx(hHook);
pulE6T7x if(unhooked==TRUE){
CZg$I&x nHookCount=0;
6JBE=9d-Q hHook=NULL;
I0oM\~# }
Ro`Hm8o/ return unhooked;
nb0V~W }
qCOe,$\1/ +avu&2B BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
rwr>43S5<3 {
_O~DJ" BOOL bAdded=FALSE;
'VCF{0{H~ for(int index=0;index<MAX_KEY;index++){
s)W^P4< if(hCallWnd[index]==0){
8E1swH5z hCallWnd[index]=hWnd;
3=V79& HotKey[index]=cKey;
NK'awv),pM HotKeyMask[index]=cMask;
iO4YZ! bAdded=TRUE;
t>><|~wp KeyCount++;
tn201TDZ]= break;
j.X3SQb4G }
1QXv}36#3n }
<e|I?zI9- return bAdded;
{Cnz7TVB }
-sl]
funRy 7u-o7#,X2 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
!Q=H)\3 {
# (B <n BOOL bRemoved=FALSE;
GQO}E@W6C for(int index=0;index<MAX_KEY;index++){
!]7r>NS> if(hCallWnd[index]==hWnd){
'"Q;54S** if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
lw0l86^Y hCallWnd[index]=NULL;
IBr?6_\%"4 HotKey[index]=0;
/qA\|'~ HotKeyMask[index]=0;
<)+9PV<w bRemoved=TRUE;
D_@WB.eL KeyCount--;
AjB-&Z break;
-4{sr|
lm }
o7E?A }
6}A1^RB+w }
0 3kzS ]g return bRemoved;
r`}')2 }
OF*m9 7HzO_u%H1 void VerifyWindow()
Qp~O!9ph {
Jj}+tQf for(int i=0;i<MAX_KEY;i++){
w=I8f}( if(hCallWnd
!=NULL){ Zo}wzY~x>I
if(!IsWindow(hCallWnd)){ gq4le=,v
hCallWnd=NULL; /<)A!Nn+F
HotKey=0; `WSm/4m
HotKeyMask=0; `=8g%O|T
KeyCount--; s,O:l0
} 6hQ?MYX
} <rV3(qb#]J
} X*6bsYbK-
} GV'Y'
<eKF
BOOL CHookApp::InitInstance() I5PI;t+
{ W>+\A"
AFX_MANAGE_STATE(AfxGetStaticModuleState()); >.N?y@
hins=AfxGetInstanceHandle(); XhjH68S(
InitHotkey(); E c[-@5x
return CWinApp::InitInstance(); <5
G+(vP
} #-kG\}
>AI65g
int CHookApp::ExitInstance() 8?AFvua}r
{ | u{NM1,
VerifyWindow(); +m kub}<a
UnInit(); y}dop1zp
return CWinApp::ExitInstance();
< TJzp
} dBkw.VOW
u*0Ck*pZ
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file OI</o0Ca
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) vfPL;__{Y]
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ .XQ_,
#if _MSC_VER > 1000 ;:NW
#pragma once (<!Yw|~
#endif // _MSC_VER > 1000 jC7`_;>=
9q;n@q:29
class CCaptureDlg : public CDialog "pGSz%i-
{ A46z2
// Construction eSNi6RvE
public: J P'|v"
BOOL bTray; &y"e|aE
BOOL bRegistered; Y}BT|
"
BOOL RegisterHotkey(); ^3?]S{1/#
UCHAR cKey; ,;9byb
UCHAR cMask; z/yNFY]i
void DeleteIcon(); %7WGodlXW
void AddIcon(); *^+8_%;1
UINT nCount; qELy'\
void SaveBmp(); k_$:?$
CCaptureDlg(CWnd* pParent = NULL); // standard constructor ^F/gJ3_;
// Dialog Data 4sOo>.<x
//{{AFX_DATA(CCaptureDlg) < ]#'6'
enum { IDD = IDD_CAPTURE_DIALOG }; 7jP
C{W
CComboBox m_Key; >sk vg
BOOL m_bControl; |c,,*^
BOOL m_bAlt; uaN0X"
BOOL m_bShift; iX,|;J|]
CString m_Path; v.Wkz9
w}
CString m_Number; seO7/h_a
//}}AFX_DATA KLi&TmIB
// ClassWizard generated virtual function overrides YJi C}.4Q
//{{AFX_VIRTUAL(CCaptureDlg) ]/>(C76
public: iQs7Ly"
virtual BOOL PreTranslateMessage(MSG* pMsg); #5*|/LD
protected: @*kQZRGK7
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support M-Gl".*f
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); KneCMFy
//}}AFX_VIRTUAL uM|*y-4
// Implementation L}r#KfIb
protected: O3H dPQ
HICON m_hIcon; ?QuD:vck
// Generated message map functions . AJ(nJ)
//{{AFX_MSG(CCaptureDlg) uEqL Dg
virtual BOOL OnInitDialog(); NVqJN$z
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ^5n"L29V
afx_msg void OnPaint(); }cUq1r-bW
afx_msg HCURSOR OnQueryDragIcon(); ghtvAG
virtual void OnCancel(); stn/
afx_msg void OnAbout(); .;#Wf@V
afx_msg void OnBrowse(); @T>\pP]o
afx_msg void OnChange(); ?86q8E3;&
//}}AFX_MSG A"Q6GM2;Io
DECLARE_MESSAGE_MAP() LDilrG)
}; h8# 14?
#endif ft$@':F
'a8{YT4
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file BWRM
gN'.
#include "stdafx.h" 4H@:|
#include "Capture.h" #w_cos[I
#include "CaptureDlg.h" 7mG/f
#include <windowsx.h> 36ygI0V_
#pragma comment(lib,"hook.lib") Q7uhz5oZ
#ifdef _DEBUG ;A^Ii>`
#define new DEBUG_NEW t2V|moG
#undef THIS_FILE wQ!C9Gp3e
static char THIS_FILE[] = __FILE__; 9p|;Hh:
#endif X)P;UVR0
#define IDM_SHELL WM_USER+1 [N]5)n
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); S3Q^K.e?
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); @APv?>$)
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Ll4/P[7:?
class CAboutDlg : public CDialog $H}G'LqiG
{ [1Cs
public: 4KH8dau.fF
CAboutDlg(); .;),e#
// Dialog Data ']]Czze
//{{AFX_DATA(CAboutDlg) N$cm;G=]
enum { IDD = IDD_ABOUTBOX }; fGK=lT$
//}}AFX_DATA >iE/t$%1
// ClassWizard generated virtual function overrides T["(wPrt
//{{AFX_VIRTUAL(CAboutDlg) K ?R*
)_
protected: ep|>z#1
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support v[-.]b*5A$
//}}AFX_VIRTUAL tb#9TF
// Implementation LBO3){=J
protected: cOz8YVR-
//{{AFX_MSG(CAboutDlg) ~=xiMB;oH
//}}AFX_MSG W@"s~I6
DECLARE_MESSAGE_MAP() Fog4m=b`g
}; Y8$Y]2
k&TZ
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) q6R``
{ q.xt%`@aA
//{{AFX_DATA_INIT(CAboutDlg) 0^l)9zE
//}}AFX_DATA_INIT wlSl ~A/s
} gXrXVv<)yw
qIXo_H&\C
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Kyn[4Bu!?
{ F@4TD]E0^
CDialog::DoDataExchange(pDX); ;!RS q'L1
//{{AFX_DATA_MAP(CAboutDlg) V]4g-
CS[
//}}AFX_DATA_MAP yiourR)H<
} uP;qs8
8\V
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) )1E[CIaXK
//{{AFX_MSG_MAP(CAboutDlg) \W%Aeg*c
// No message handlers ,q[aV 6kO
//}}AFX_MSG_MAP \&[Jtv *
END_MESSAGE_MAP() c4\Nuy
abs\Ku9
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) H@-txO1`::
: CDialog(CCaptureDlg::IDD, pParent) JI"&3H")g%
{ no~Yet+<"
//{{AFX_DATA_INIT(CCaptureDlg) 6A$
Y]u
m_bControl = FALSE; jFE1k(2e
m_bAlt = FALSE; {DP%=4
m_bShift = FALSE; y~16o
m_Path = _T("c:\\"); YTb/ LeuT
m_Number = _T("0 picture captured."); S5%I+G3
nCount=0; 3vcKK;qCB
bRegistered=FALSE; ]x;*Z&
bTray=FALSE; 1]DPy+
//}}AFX_DATA_INIT Oq[2<ept
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 |IN{8
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); $G\IzK
} #Qir%\*V
Ll2yJ
.C4
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) q:iB}ch5R
{ (SH<]@s
CDialog::DoDataExchange(pDX); "#ctT-g`6
//{{AFX_DATA_MAP(CCaptureDlg) `]u!4pP"
DDX_Control(pDX, IDC_KEY, m_Key); /"q
wC
DDX_Check(pDX, IDC_CONTROL, m_bControl); AbqeZn
DDX_Check(pDX, IDC_ALT, m_bAlt); pgp@Zw)r)k
DDX_Check(pDX, IDC_SHIFT, m_bShift); %1\MW+
DDX_Text(pDX, IDC_PATH, m_Path); "W"2Y(
DDX_Text(pDX, IDC_NUMBER, m_Number); \ytF@"7
//}}AFX_DATA_MAP F\K&$5J{p
} !@.9>"FU
5*~]=(BE
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) cN{(XmX5n
//{{AFX_MSG_MAP(CCaptureDlg) ) (4.7>
ON_WM_SYSCOMMAND() E((U=P}+g
ON_WM_PAINT() goJK~d8M*
ON_WM_QUERYDRAGICON() Xc>M_%+R
ON_BN_CLICKED(ID_ABOUT, OnAbout) VuU{7:
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) %I`%N2ss
ON_BN_CLICKED(ID_CHANGE, OnChange) ?QbxC,& i
//}}AFX_MSG_MAP AlVBhR`
END_MESSAGE_MAP() @N(*1,s2
xJNV^u
BOOL CCaptureDlg::OnInitDialog() ?FV>[&-h#I
{ Oh&k{DWE$
CDialog::OnInitDialog(); P5$L(x%~
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); jV)4+D
ASSERT(IDM_ABOUTBOX < 0xF000); yJ0q)x sS
CMenu* pSysMenu = GetSystemMenu(FALSE); J*%XtRio
if (pSysMenu != NULL) 8.Z9 i
{ F{'lF^Dc
CString strAboutMenu; NKX,[o1
strAboutMenu.LoadString(IDS_ABOUTBOX); be->ofUYgs
if (!strAboutMenu.IsEmpty()) 6Fe$'TP
{ `!um)4
pSysMenu->AppendMenu(MF_SEPARATOR); i 6DcLE
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); _ Vo35kA
} Yg~$1b@
} A.8[FkiNmD
SetIcon(m_hIcon, TRUE); // Set big icon 8AGP*"gI
SetIcon(m_hIcon, FALSE); // Set small icon Y|3n^%I
m_Key.SetCurSel(0); uOv0ut\\G
RegisterHotkey(); SJ%h.u@&@F
CMenu* pMenu=GetSystemMenu(FALSE); (X{o =co,
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); llK7~uOC
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 'xG:v)(
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); CAJ]@P#Xj+
return TRUE; // return TRUE unless you set the focus to a control Y3n6y+Uzk
} }w|a^=HAp
}%}yOLo:
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) T {![a{
{ lL$no7HBy
if ((nID & 0xFFF0) == IDM_ABOUTBOX) >Ohh)$
{ Wcf;ZX
CAboutDlg dlgAbout; NB.s2I7
dlgAbout.DoModal(); !k}]` z^d
} }2!=1|}
else JtbwY@R
{ <rbzsn"a
CDialog::OnSysCommand(nID, lParam); \'>ZU-V
} @5,Xr`]
} qOD:+b
gK#G8V-,
void CCaptureDlg::OnPaint() "C~Zl&3
{ <J
o\RUx
if (IsIconic()) d7U%Q8?wUR
{ eKv{N\E
CPaintDC dc(this); // device context for painting u$MXO].Q
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); H[e=^JuD
// Center icon in client rectangle `^G?+p2E
int cxIcon = GetSystemMetrics(SM_CXICON); d95 $w8>
int cyIcon = GetSystemMetrics(SM_CYICON); NGs@z^&V
CRect rect; OH_ m ZA
GetClientRect(&rect); p_:bt7
B
int x = (rect.Width() - cxIcon + 1) / 2; "0sk(kT
int y = (rect.Height() - cyIcon + 1) / 2; !zR1CM
// Draw the icon ej;\a:JL
dc.DrawIcon(x, y, m_hIcon); 1${rQ9FIF
} .dQEr~f #}
else ZDl6F`
{ "T~ce@
CDialog::OnPaint(); Er !s\(h
} Rch?@O#J
} _9B ^@~
1$toowb"Zy
HCURSOR CCaptureDlg::OnQueryDragIcon() :H8`z8=0f{
{ )r`F}_CEL
return (HCURSOR) m_hIcon; 8w\ZY>d
} WW[G ne
)d =8)9B
void CCaptureDlg::OnCancel() @\}w8
{ T:|PSJc0
if(bTray) RK\$>KFE
DeleteIcon(); nN*:"F/^
CDialog::OnCancel(); av:9kPKm
} `;v5o4.`
C#tY};t
void CCaptureDlg::OnAbout() 277Am*2
{ H"vy[/UcR
CAboutDlg dlg; [R%Pf/[Fr
dlg.DoModal(); .DN)ck:e;
} c-".VF
5m\T~[`%
void CCaptureDlg::OnBrowse() +m]Kj3-z@
{ gu|cQ2xV
CString str; Qs
#7<NQ
BROWSEINFO bi; wxW\L!@
char name[MAX_PATH]; (-bLP
ZeroMemory(&bi,sizeof(BROWSEINFO)); ? f>pKe
bi.hwndOwner=GetSafeHwnd(); 2J1YrHj3
bi.pszDisplayName=name; G5hh$Nmpi
bi.lpszTitle="Select folder"; eW/sPQ-
bi.ulFlags=BIF_RETURNONLYFSDIRS; n/vKxtW
LPITEMIDLIST idl=SHBrowseForFolder(&bi); 6U?z
if(idl==NULL) !W48sZr1&
return; _gn`Y(c$%
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ]`H8r y2
str.ReleaseBuffer(); \ Q E?.Fx
m_Path=str; f~-Ipq;F
if(str.GetAt(str.GetLength()-1)!='\\') ] IeyJ
m_Path+="\\"; VqBb=1r%o7
UpdateData(FALSE); @@~Ql
} L>>Cx`ASi
kW.it5Z#
void CCaptureDlg::SaveBmp() i&',g
{ `44 }kkBT
CDC dc; q-5U,!!W/
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 9LK<u $C
CBitmap bm; ["}Yp
int Width=GetSystemMetrics(SM_CXSCREEN); [
m#|[%
int Height=GetSystemMetrics(SM_CYSCREEN); vq;_x
bm.CreateCompatibleBitmap(&dc,Width,Height); ^wTod\y
CDC tdc; xu(N'l.7&
tdc.CreateCompatibleDC(&dc); M9dOLM.
CBitmap*pOld=tdc.SelectObject(&bm); U_l#lGA(H
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); E@N& Y1t
tdc.SelectObject(pOld); @q<F_'7is
BITMAP btm; ffgb3
bm.GetBitmap(&btm); #z&@f
DWORD size=btm.bmWidthBytes*btm.bmHeight; $5v:z
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); rc ()Eo50
BITMAPINFOHEADER bih; IuN:*P
bih.biBitCount=btm.bmBitsPixel; 0.kQqy~5
bih.biClrImportant=0; _YPu
bih.biClrUsed=0; :W*']8 M-
bih.biCompression=0; R0DWjN$j
bih.biHeight=btm.bmHeight; 'A)r)z{X
bih.biPlanes=1; w\(;>e@
bih.biSize=sizeof(BITMAPINFOHEADER); Xn3
\a81
bih.biSizeImage=size; x!^u$5c
bih.biWidth=btm.bmWidth; KXvBJA$
bih.biXPelsPerMeter=0; ReZ&SNJ
bih.biYPelsPerMeter=0; u~\I
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); s$PPJJT{b
static int filecount=0; XPd@>2
CString name; WB(Gx_o3
name.Format("pict%04d.bmp",filecount++); \95O
name=m_Path+name; w$j!89@)
BITMAPFILEHEADER bfh; "79"SSfOc
bfh.bfReserved1=bfh.bfReserved2=0; ML-?#jNa<
bfh.bfType=((WORD)('M'<< 8)|'B'); SU80i`
bfh.bfSize=54+size; dWDM{t\}\
bfh.bfOffBits=54; jc-$l
CFile bf; 8AQ@?\Rc"2
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 9aKt (g6
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); R\^XF8n6/
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ml\2%07
bf.WriteHuge(lpData,size); H%^j yGS
bf.Close(); c$AwJhl^]
nCount++; Jh!'"7
} aZBb@~Y
GlobalFreePtr(lpData); 4b<>gpQ
if(nCount==1) H){lXR/#u
m_Number.Format("%d picture captured.",nCount); +x_9IvaW&?
else 29~Bu5
m_Number.Format("%d pictures captured.",nCount); .^aqzA=]
UpdateData(FALSE); u{d\3-]/
} W &HF*Aw
jGaI6G'N
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) lk`,s
{ ),;O3:n
if(pMsg -> message == WM_KEYDOWN) nLc Oz3h
{ 9?L,DThQ
if(pMsg -> wParam == VK_ESCAPE) 9Atnnx]n
return TRUE; AttS?TZr
if(pMsg -> wParam == VK_RETURN) /@`kM'1:
return TRUE; sBV})8]KM
} [44C`x[8M+
return CDialog::PreTranslateMessage(pMsg); V9cKl[
} GT3?)g{Z
4ht+u
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) uqFYa bU
{ bz4TbGg]
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ {j!+\neL
SaveBmp(); oasEG6OI8
return FALSE; D/x!`&.sN
} O\&[|sGY{
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ _oBJ'8R\
CMenu pop; >Ndck2@
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); #cdrobJ
CMenu*pMenu=pop.GetSubMenu(0); 9#iv|X
pMenu->SetDefaultItem(ID_EXITICON); ^oYudb^%
CPoint pt; unZYFA}(
GetCursorPos(&pt); yhzZ[vw7k
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); .lE7v -e
if(id==ID_EXITICON) UD}#c:I
DeleteIcon(); Z:3SI$tO
else if(id==ID_EXIT) '#Pg:v_
OnCancel(); /.>8e%)
return FALSE; (W'.vEl
} RjW<
H6a"K
LRESULT res= CDialog::WindowProc(message, wParam, lParam); I/V lH:o
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) _&xi})E^O]
AddIcon(); ]
lONi
return res; e|2@z-Sp-
} ).D+/D/"2
:y%CP8
void CCaptureDlg::AddIcon() l Taw6;
{ <]e 0TU?bk
NOTIFYICONDATA data; f9FEH7S68
data.cbSize=sizeof(NOTIFYICONDATA); 5@&{%99
CString tip; A$Tp0v`t
tip.LoadString(IDS_ICONTIP); 'wm :Xa
data.hIcon=GetIcon(0); M`u&-6
data.hWnd=GetSafeHwnd(); op5G}QZ
strcpy(data.szTip,tip); Tc.k0n%W:b
data.uCallbackMessage=IDM_SHELL; BK;Gh0mp
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; {.mPe|
data.uID=98; i0/RvrLc
Shell_NotifyIcon(NIM_ADD,&data); Pua|Z
x
ShowWindow(SW_HIDE); {>rGe#Vu
bTray=TRUE; 6G0Y,B7&
} ?CU6RC n
Ww)p&don
void CCaptureDlg::DeleteIcon() yDe6f(D
{ r)xkpa5
NOTIFYICONDATA data; (Xv'Te?
data.cbSize=sizeof(NOTIFYICONDATA); Tt\h#E
data.hWnd=GetSafeHwnd(); SSo7
U
data.uID=98; 9?J
3G,&
Shell_NotifyIcon(NIM_DELETE,&data); _`- trE.
ShowWindow(SW_SHOW); ckhU@C|=*
SetForegroundWindow(); E8LA+dKN:
ShowWindow(SW_SHOWNORMAL); F(}~~EtPHo
bTray=FALSE; CaE1h9
} RJhafUJ zH
OPe3p {]
void CCaptureDlg::OnChange() )oAx t70
{ lNRGlTD%
RegisterHotkey(); SR8)4:aKW
} Q!*}^W
|S0nR<x-M
BOOL CCaptureDlg::RegisterHotkey() F)n^pT
{ g:rjt1w`D
UpdateData(); F :p9y_W
UCHAR mask=0; =&~7Q"
UCHAR key=0; 9S_PZH
if(m_bControl) vOQ
3A%/
mask|=4; 1=U NA :t<
if(m_bAlt) 68 \73L=
mask|=2; hI>vz"J
if(m_bShift) DElrY)3O.
mask|=1; Q/zlU@
key=Key_Table[m_Key.GetCurSel()]; cN3!wE
if(bRegistered){ CyXFuk!R
DeleteHotkey(GetSafeHwnd(),cKey,cMask); 'nRoa7v(
bRegistered=FALSE; {a9(
Qi
} '
Ih f|;r
cMask=mask; ='G-wX&k
cKey=key; 3LW_qX
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 0aM&+j\q}
return bRegistered; ^Iy'G44
} 6 @A'N(I=O
Mv?$zV"`#
四、小结 wSd|-e
JEh(A=Eu>
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。