I found a great code to change the icon of an executable. Here it is (I hope
it helps) :
#include <io.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <windows.h>
#pragma pack(push, 2)
typedef struct {
WORD Reserved1; // reserved, must be 0
WORD ResourceType; // type is 1 for icons
WORD ImageCount; // number of icons in structure (1)
BYTE Width; // icon width (32)
BYTE Height; // icon height (32)
BYTE Colors; // colors (0 means more than 8 bits per pixel)
BYTE Reserved2; // reserved, must be 0
WORD Planes; // color planes
WORD BitsPerPixel; // bit depth
DWORD ImageSize; // size of structure
WORD ResourceID; // resource ID
} GROUPICON;
#pragma pack(pop)
void InjectMainIcon(char *Where, char *What)
{
HANDLE hWhere = BeginUpdateResource(Where, FALSE);
char *buffer; // buffer to store raw icon data
long buffersize; // length of buffer
int hFile; // file handle
hFile = open(What, O_RDONLY | O_BINARY);
if (hFile == -1)
return; // if file doesn't exist, can't be opened etc.
// calculate buffer length and load file into buffer
buffersize = filelength(hFile);
buffer = (char *)malloc(buffersize);
read(hFile, buffer, buffersize);
close(hFile);
UpdateResource(
hWhere, // Handle to executable
RT_ICON, // Resource type - icon
MAKEINTRESOURCE(1), // Make the id 1
MAKELANGID(LANG_ENGLISH,
SUBLANG_DEFAULT), // Default language
(buffer+22),
// skip the first 22 bytes because this is the
// icon header&directory entry (if the file
// contains multiple images the directory entries
// will be larger than 22 bytes
buffersize-22 // length of buffer
);
// Again, we use this structure for educational purposes.
// The icon header and directory entries can be read from
// the file.
GROUPICON grData;
// This is the header
grData.Reserved1 = 0; // reserved, must be 0
grData.ResourceType = 1; // type is 1 for icons
grData.ImageCount = 1; // number of icons in structure (1)
// This is the directory entry
grData.Width = 32; // icon width (32)
grData.Height = 32; // icon height (32)
grData.Colors = 0; // colors (256)
grData.Reserved2 = 0; // reserved, must be 0
grData.Planes = 2; // color planes
grData.BitsPerPixel = 32; // bit depth
grData.ImageSize = buffersize - 22; // size of image
grData.ResourceID = 1; // resource ID is 1
UpdateResource(
hWhere,
RT_GROUP_ICON,
// RT_GROUP_ICON resources contain information
// about stored icons
"MAINICON",
// MAINICON contains information about the
// application's displayed icon
MAKELANGID(LANG_ENGLISH, SUBLANG_DEFAULT),
&grData,
// Pointer to this structure
sizeof(GROUPICON)
);
delete buffer; // free memory
// Perform the update, don't discard changes
EndUpdateResource(hWhere, FALSE);
}
/*int main(int argc, char * argv[])
{
InjectMainIcon("col.exe","hd.ico");
return 1;
}*/
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